Updated on 2024/05/15

写真a

 
KATSUBE Ryoji
 
Organization
Graduate School of Engineering Materials Process Engineering 2 Lecturer
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Materials Science and Engineering
Title
Lecturer
Contact information
メールアドレス
External link

Degree 3

  1. Ph.D. in Engineering ( 2018.3   Kyoto University ) 

  2. Master of Engineering ( 2015.3   Kyoto University ) 

  3. Bachelor of Engineering ( 2013.3   Kyoto University ) 

Research Interests 6

  1. Interface

  2. Solar Cells

  3. Chemical Thermodynamics

  4. Compound Semiconductor

  5. solidification

  6. in-situ observation

Research Areas 2

  1. Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

  2. Nanotechnology/Materials / Metals production and resources production

Current Research Project and SDGs 4

  1. りん化物太陽電池材料の開拓

  2. 金属材料の凝固初期現象の解明と制御

  3. 高活性合金の凝固・相変態過程のその場観察

  4. 液体金属の完全濡れ現象を活用した半導体薄膜プロセッシング

Research History 5

  1. Nagoya University   Graduate School of Engineering Materials Process Engineering   Lecturer

    2024.3

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    Country:Japan

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  2. Kyoto University   Graduate School of Engineering Deprtment of Materical Science and Engineering   Assistant Professor

    2021.3 - 2024.2

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    Country:Japan

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  3. Kyoto University   Graduate School of Engineering Deprtment of Materical Science and Engineering   Research associate

    2020.4 - 2021.2

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  4. Kyoto University   Department of Materials Science and Engineering   Researcher

    2018.4 - 2020.3

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  5. Arizona State University (Prof. Sefaattin Tongay)   Visiting Faculty

    2017.9 - 2017.11

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Education 2

  1. Kyoto University   Graduate School of Engineering   PhD cource, Department of Materials Science and Engineering

    2015.4 - 2018.3

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  2. Kyoto University   Graduate School of Engineering   Master course, Department of Materials Science and Engineering

    2013.4 - 2015.3

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Professional Memberships 5

  1. Japan Foundry Engineering Society

    2022.9

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  2. The Iron and Steel Institute of Japan

    2021.4

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  3. The Japan Institute of Metails and Materials

    2021.2

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  4. The Japan Photovoltaic Sciety

    2020.9

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  5. THE JAPAN SOCIETY OF APPLIED PHYSICS

    2014.1

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Awards 5

  1. The Japan Institute of Metals and Materials Metallography Award

    2024.3   The Japan Institute of Metals and Materials   Time-resolved CT-XRD observation of the solidification sequence of Ti-48Al-2Cr-2Nb alloys

    Ryoji Katsube, Taka Narumi, Hideyuki Yasuda

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  2. Student paper award

    2017.11   27th International Photovoltaic Science and Engineering Conference (PVSEC-27)  

    Ryoji Katsube, Kenji Kazumi, Yoshitaro Nose

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  3. Poster Award

    2016.1   Kansai branch, The Iron and Steel Institute of Japan-The Japan Institute of Metals and Materials  

    Ryoji Katsube, Yoshirato Nose, Yasuharu Shirai

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  4. Madume Research Encouragement Prize

    2015.7   Graduate School of Enginnering, Kyoto University  

    Ryoji Katsube

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  5. Presentation Award

    2015.1   The 2nd JAPAN-KOREA Joint Workshop on Compound Semiconductor based Solar Cells  

    Ryoji Katsube, Akira Nagaoka, Yoshirato Nose, Kenji Yoshino, Yasuharu ShiraiRyoji Katsube

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Papers 27

  1. Solidification microstructures of V-Nb-Mo-Ta-W alloys: Insights from non-equiatomic alloys Reviewed

    Ryoji Katsube, Shigehiro Tokuri, Keita Nakano, Taka Narumi, Hideyuki Yasuda

    Journal of Alloys and Compounds   Vol. 981   page: 173656   2024.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jallcom.2024.173656

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  2. Solidification sequence of CrMnFeCoCu dual-FCC multicomponent alloy Reviewed

    Ryoji Katsube, Litian Luo, Keita Nakano, Taka Narumi, Hideyuki Yasuda

    Scripta Materialia   Vol. 231   page: 115459   2023.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.scriptamat.2023.115459

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  3. In situ observation of solidification in peritectic steels and evaluation of the strains induced in the solidifying shell Reviewed

    H Yasuda, T Narumi, R Katsube, Y Nanri

    IOP Conference Series: Materials Science and Engineering   Vol. 1281 ( 1 ) page: 012032 - 012032   2023.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    In the continuous casting of peritectic steels, unevenness and cracks of the solidifying shell are typical casting defects. This study focuses on the ferrite–austenite transformation and the influence of the transformation on the solidifying shell deformation. In situ observations revealed that the austenite hardly nucleated and, consequently, the undercooled ferrite massively transformed to the austenite in the solid state. Simultaneously, the austenite rapidly solidified in the remaining liquid. The volume changes due to the ferrite–austenite transformation and the solidification shrinkage were measured using time-resolved tomography. On the basis of the observations and measurements, a model that includes the ferrite–austenite transformation and the austenite solidification was proposed to evaluate the volumetric strains in the solidifying shell. There was a sharp peak in the volumetric strains derived from the model at hypo-peritectic compositions. This work demonstrates the need to include the ferrite–austenite transformation in the solid state and the rapid austenite solidification for understanding the solidifying shell deformation in peritectic steels.

    DOI: 10.1088/1757-899x/1281/1/012032

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    Other Link: https://iopscience.iop.org/article/10.1088/1757-899X/1281/1/012032/pdf

  4. Reconstruction of dendritic growth by fast tomography and phase field filtering Reviewed

    H Yasuda, A Nishiguchi, H Xue, M Nonomura, K Nakano, R Katsube, T Narumi, T Takaki

    IOP Conference Series: Materials Science and Engineering   Vol. 1281 ( 1 ) page: 012064 - 012064   2023.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    Three dimensional models of dendritic structures during solidification are valuable for building physical models, validating simulated results, estimating some properties such as permeability in the mushy, simulating semisolid deformation and so on. Thus, it is of interest to observe microstructure evolution in situ. Time-resolved tomography combined with X-ray diffraction has allowed us to observe the evolution of dendritic structures and to measure crystallographic orientation in situ. Reconstruction still proves to be difficult for some alloy systems because of the tradeoff between time and spatial resolution. This paper demonstrates the reconstruction of dendritic structures for three different alloy systems (Al-10mass%Cu alloy with a diameter of 4 mm, CrMnFeCoNi alloy with 1 mm, and Zn-4mass%Al alloy with 0.7 mm). The observations were performed in a synchrotron radiation facility SPring-8. A filter using a phase field model was introduced to reconstruct the three-dimensional images. Parameters used in the filtering were consistently determined based on the raw reconstruction images. Evaluation of solid-liquid interface area and curvature was significantly improved by the filter. For the Al-Cu alloy, a three-dimensional model containing approximately 300 million voxels was obtained. For the CrMnFeCoNi alloys, the preferred growth direction <100> was confirmed by tomography and X-ray diffraction. For the Zn-Al alloy, the observed 14 growth directions were not simply defined by the crystallographic orientations, although the directions were consistent with the hexagonal symmetry. This study verifies that time resolved tomography, X-ray diffraction and the filter using a phase field model provide three dimensional models for light metal alloys with rather large diameters and 3d transition-metal alloys with rather large X-ray absorption coefficients. The models are expected to be used for further studies.

    DOI: 10.1088/1757-899x/1281/1/012064

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    Other Link: https://iopscience.iop.org/article/10.1088/1757-899X/1281/1/012064/pdf

  5. Crystalline-face-dependent photoelectrochemical properties of single crystalline CuGaSe2 photocathodes for hydrogen evolution under sunlight radiation Reviewed

    Shigeru Ikeda, Wakaba Fujita, Ryoji Katsube, Yoshitaro Nose, Hajime Suzuki, Ryu Abe, Kenji Yoshino

    Electrochimica Acta   Vol. 454   page: 142384 - 142384   2023.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.electacta.2023.142384

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  6. Microstructure evolution induced by solidification and ferrite–austenite massive-like transformation in Fe–C alloys

    S Tsuji, T Nanri, T Narumi, R Katsube, H Yasuda

    IOP Conference Series: Materials Science and Engineering   Vol. 1274 ( 1 ) page: 012055 - 012055   2023.1

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    Publishing type:Research paper (international conference proceedings)   Publisher:IOP Publishing  

    Abstract

    The coarsening of austenite grains produced through a massive-like transformation from the ferrite to the austenite phase during/after solidification in Fe–0.45mass%C steel was examined through time-resolved X-ray diffraction measurements using time-resolved computed tomography. The δ phase solidification resulted in a single δ grain in the observation region (0.6 mm in diameter, 0.1 mm in height). The massive-like transformation produced multiple γ grains, and coarsening immediately followed the transformation. The coarsening in the observation region was completed even within 200 s. A correlation of crystallographic orientation between the γ grains was found in the γ grain structure. The massive-like transformation frequently produced fcc (111) twinned grains, and the twinned austenite grains tended to remain during coarsening because the twin interface energy is lower than the grain boundary energy. The massive-like transformation following the solidification contributed to the texture formation in the γ grain structure.

    DOI: 10.1088/1757-899x/1274/1/012055

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    Other Link: https://iopscience.iop.org/article/10.1088/1757-899X/1274/1/012055/pdf

  7. Observation of grain motion during semisolid deformation by using 4D-CT and 3DXRD

    T Narumi, K Ohta, M Ohta, T Numata, K Asahi, R Katsube, H Yasuda

    IOP Conference Series: Materials Science and Engineering   Vol. 1274 ( 1 ) page: 012053 - 012053   2023.1

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    Publishing type:Research paper (international conference proceedings)   Publisher:IOP Publishing  

    Abstract

    A technique combining time-resolved computed tomography (4D-CT) and three-dimensional X-ray diffraction (3DXRD) was employed to investigate semisolid deformation in an Al-10mass%Cu alloy with the equiaxed grain structure. The diffraction patterns and reconstructed 3D images were used to quantitatively analyse the translational and rotational motions of solid grains in the semisolid alloy. Finally, the motion of solid grains and the expansion of porosity during the compression tests are discussed on the basis of in situ observations.

    DOI: 10.1088/1757-899x/1274/1/012053

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    Other Link: https://iopscience.iop.org/article/10.1088/1757-899X/1274/1/012053/pdf

  8. Machine-learning-based phase diagram construction for high-throughput batch experiments Reviewed

    Ryo Tamura, Guillaume Deffrennes, Kwangsik Han, Taichi Abe, Haruhiko Morito, Yasuyuki Nakamura, Masanobu Naito, Ryoji Katsube, Yoshitaro Nose, Kei Terayama

    Science and Technology of Advanced Materials: Methods   Vol. 2 ( 1 ) page: 153 - 161   2022.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa {UK} Limited  

    DOI: 10.1080/27660400.2022.2076548

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  9. Synthesis of alkaline-earth Zintl phosphides MZn2P2 (M = Ca, Sr, Ba) from Sn solutions Reviewed

    Ryoji Katsube, Yoshitaro Nose

    High Temperature Materials and Processes   Vol. 41 ( 1 ) page: 8 - 15   2022.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Walter de Gruyter GmbH  

    <title>Abstract</title>
    Exploration of suitable partner materials (so-called buffer layer or n-type emitter) for each light-absorbing material is essential to practicalize various emerging photovoltaic devices. Motivated by our recent discovery of a partner material, Mg(Mg<sub>
    <italic>x</italic>
    </sub>Zn<sub>1−<italic>x</italic>
    </sub>)<sub>2</sub>P<sub>2</sub>, in Mg/Zn<sub>3</sub>P<sub>2</sub> solar cells, the related series of materials <italic>M</italic>Zn<sub>2</sub>P<sub>2</sub> (<italic>M</italic> = Ca, Sr, Ba) is of interest to the application in pnictide-based solar cells. In this study, we synthesize these materials to evaluate the optoelectronic properties concerning photovoltaic applications. To deal with the difficulties of the high vapor pressure and reactivity of the constituent elements, we utilized Sn as a solvent to reduce their activities during heat treatments. Powders that are mainly composed of <italic>M</italic>Zn<sub>2</sub>P<sub>2</sub> were obtained by crushing the samples after solution growth, although single-phase crystals of <italic>M</italic>Zn<sub>2</sub>P<sub>2</sub> could not be obtained in this study. The optical bandgap and the ionization potential of each <italic>M</italic>Zn<sub>2</sub>P<sub>2</sub> were evaluated through the diffuse reflectance and the photoelectron yield spectroscopy measurements of the powder. As a result, we found that CaZn<sub>2</sub>P<sub>2</sub> would be a promising partner material in photovoltaics based on Zn<sub>3</sub>P<sub>2</sub> and ZnSnP<sub>2</sub>.

    DOI: 10.1515/htmp-2022-0019

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    Other Link: https://www.degruyter.com/document/doi/10.1515/htmp-2022-0019/pdf

  10. Fabrication process and device application of chalcopyrite phosphides based on thermodynamics Reviewed

    Yoshitaro Nose, Ryoji Katsube, Taro Kuwano

    JSAP Review   Vol. 2022   page: 220411   2022.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Applied Physics  

    In this article, we introduce our studies on the application of chalcopyrite phosphides to solar cells, including bulk crystal growth based on the phase diagram, and thin film deposition through chemical potential diagram. A phase diagram is a useful tool for the fabrication of multi-component materials, while the chemical potential diagram, which is a kind of phase diagram with chemical potentials as axes, is well suited for discussing vapor growth. As another example of using the chemical potential diagram, the stability of a hetero-interface is presented. In addition, bandgap control through order-disorder phenomena is described.

    DOI: 10.11470/jsaprev.220411

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  11. Acceleration of phase diagram construction by machine learning incorporating Gibbs' phase rule Reviewed

    Kei Terayama, Kwangsik Han, Ryoji Katsube, Ikuo Ohnuma, Taichi Abe, Yoshitaro Nose, Ryo Tamura

    Scripta Materialia   Vol. 208   page: 114335 - 114335   2022.2

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    DOI: 10.1016/j.scriptamat.2021.114335

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  12. Deep level transient spectroscopy and photoluminescence studies of hole and electron traps in ZnSnP2 bulk crystals Reviewed

    Taro Kuwano, Ryoji Katsube, Steve Johnston, Adele Tamboli, Yoshitaro Nose

    Japanese Journal of Applied Physics   Vol. 61 ( 2 )   2021.12

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    ZnSnP2, an emerging inorganic material for solar cells, was characterized by deep level transient spectroscopy (DLTS) and photoluminescence (PL). Acceptor- and donor-like traps with shallow energy levels were detected by DLTS analysis. The previous study based on first-principle calculation also suggested such traps were due to antisite defects of Zn and Sn. PL measurements also revealed sub-gap transitions related to these trap levels. Additionally, DLTS found a trap with a deep level in ZnSnP2. A short lifetime of minority carrier in previous work might be due to such trap, coming from phosphorus vacancies and/or zinc interstitials suggested by the first-principle study.

    DOI: 10.35848/1347-4065/ac468a

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  13. Optical and Electrical Transport Evaluations of n-Type Iron Pyrite Single Crystals Reviewed

    Shunsuke Uchiyama, Ryosuke Sato, Ryoji Katsube, Muhammad Monirul Islam, Hideaki Adachi, Takeaki Sakurai, Yoshitaro Nose, Yasuaki Ishikawa

    ACS Omega     2021.11

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    DOI: 10.1021/acsomega.1c05232

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  14. Performance enhancement of ZnSnP2 solar cells by a Cu3P back buffer layer Reviewed

    Taro Kuwano, Ryoji Katsube, Kenji Kazumi, Yoshitaro Nose

    Solar Energy Materials and Solar Cells   Vol. 221   page: 110891 - 110891   2021.3

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    In this study, we investigated reactive diffusion at the interface between a Cu back electrode and a ZnSnP2 absorber, at which ohmic behavior was previously confirmed by appropriate annealing. Cross-sectional observation of the Cu/ZnSnP2 interface revealed that Cu3P was formed along the ZnSnP2 surface after annealing. It was also found that Cu3P was epitaxially formed beside ZnSnP2 with a lattice-mismatch of less than 0.5% by electron diffraction around the Cu3P/ZnSnP2 interface and consideration of atomic arrangements, particularly the phosphorus sublattice, in both phosphides. In addition, photoelectron yield spectroscopy revealed that the work function of Cu3P and ionization potential of ZnSnP2 are both about 5.2 eV, suggesting that the potential barrier against hole transport is small at the Cu3P/ZnSnP2 interface. The formation of Cu3P at the interface leads to higher current density and no roll-over of J-V curves in ZnSnP2 solar cells. Consequently, the highest efficiency of ZnSnP2 solar cells of 3.87% was achieved by intentionally prepared Cu3P using sputtering. It is concluded that Cu3P is a promising back buffer material for ZnSnP2 solar cells due to the alignment with ZnSnP2 from the viewpoints of band and lattice structures.

    DOI: 10.1016/j.solmat.2020.110891

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  15. Experimental establishment of phase diagram guided by uncertainty sampling: an application to the deposition of Zn-Sn-P films by molecular beam epitaxy Reviewed

    Ryoji Katsube, Kei Terayama, Ryo Tamura, Yoshitaro Nose

    ACS Materials Letters   Vol. 2   page: 571 - 575   2020.4

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  16. Comparison of Sb, As, and P doping in Cd-rich CdTe single crystals: Doping properties, persistent photoconductivity, and long-term stability Reviewed

    Akira Nagaoka, Kensuke Nishioka, Kenji Yoshino, Ryoji Katsube, Yoshitaro Nose, Taizo Masuda, Michael A. Scarpulla

    APPLIED PHYSICS LETTERS   Vol. 116 ( 13 )   2020.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    Acceptor doping CdTe with group-V elements is promising for increasing the power conversion efficiency of CdTe photovoltaic devices via an increased hole concentration and open circuit voltage (V-OC). In past work, we have investigated doping with As in Cd-rich CdTe single crystals grown using the Cd-solvent traveling heater method we have developed. In this study, we compare the doping parameters and stability of hole concentration in the light and dark for P, As, and Sb dopants in crystals cooled very slowly from the growth temperature to approximate thermal equilibrium. In contrast to older reports of a high acceptor ionization energy for Sb, our temperature dependent Hall effect experiments reveal an acceptor ionization energy slightly above 90meV for Sb doping in the mid 10(16) cm(-3) range. Room temperature hole concentrations above 10(16) cm(-3) are observed for P, As, and Sb with each dopant type exhibiting only small changes in hole concentrations over 2 years' time at room temperature. Crystals doped with P, As, or Sb exhibit increased conductivity after above-gap illumination, which decays over periods of minutes to hours depending on temperature. Analysis of the photoconductivity decay reveals a barrier attributed to hole capture of 190-280meV for the series P, As, and Sb.

    DOI: 10.1063/5.0004883

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  17. Preparation of a CuGaSe2 single crystal and its photocathodic properties Reviewed

    Shigeru Ikeda, Wakaba Fujita, Riku Okamoto, Yoshitaro Nose, Ryoji Katsube, Kenji Yoshino, Takashi Harada

    RSC Advances   Vol. 10 ( 66 ) page: 40310 - 40315   2020

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    <p>Sunlight-induced photoelectrochemical H<sub>2</sub> evolution was achived by using a photocathode based on a chalcopyrite CuGaSe<sub>2</sub> single crystal.</p>

    DOI: 10.1039/d0ra07904a

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  18. Experimental investigation of phase equilibria around a ternary compound semiconductor Mg(MgxZn1-x)(2)P-2 in the Mg-P-Zn system at 300 degrees C using Sn flux Reviewed

    Ryoji Katsube, Yoshitaro Nose

    JOURNAL OF SOLID STATE CHEMISTRY   Vol. 280   page: 100 - 105   2019.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    Mg(MgxZn1-x)(2)P-2 was found to be a key material in Zn3P2-based solar cells, which have attracted attention as an earth-abundant photovoltaic technology. However, Mg(MgxZn1-x)(2)P-2 has not been investigated as a functional material thus far, and even the single-phase range in the Mg-P-Zn equilibrium phase diagram is currently unknown. Thus, in this work, we investigate the phase equilibria around Mg(MgxZn1-x)(2)P-2 in the Mg-P-Zn system using Sn as a flux for equilibrium experiments. We find that Mg(MgxZn1-x)(2)P(2)exists as a single phase with a trigonal P (3) over bar m1 structure from x = 0 to x = 0.55 based on our XRD and the SEM-EDS analyses. The lattice parameters, a and c, monotonically increase with increase in the Mg content. In addition, the Mg(MgxZn1-x)(2)P-2 phase can equilibrate with Zn3P2 only in the case of x = 0 (MgZn2P2) despite the wide composition range available. The lattice mismatch between MgZn2P2 and Zn3P2 is about 0.5%, which is consistent with our previous results of an electron diffraction study on Mg(MgxZn1-x)(2)P-2/Zn3P2 interfaces. We also find that the interface between Mg and Mg(MgxZn1-x)(2)P-2 is unstable and that the interface reaction is expected to result in the formation of the Mg-rich phosphide phase, which is air- and water-sensitive. The instability of the reaction product in the atmosphere can degrade the device via the formation of voids around the interface, which was observed in our previous work. Therefore, we deduce that Mg is not suitable as the surface electrode of Mg(MgxZn1-x)(2)P-2/Zn3P2 solar cells. The phase equilibria established in this study can aid in redesigning the device structure of Zn3P2-based solar cells and in further investigation of the physical properties of Mg(MgxZn1-x)(2)P-2.

    DOI: 10.1016/j.jssc.2019.120983

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  19. Formation mechanism of InP films by phosphidation under controlled chemical potential and wetting behavior Reviewed

    Ryoji Katsube, Yuming Yang, Shigeru Nakatsuka, Yoshitaro Nose

    ACS Applied Electronic Materials   Vol. 1   page: 877 - 882   2019.6

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acsaelm.9b00084

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  20. Improvement of Ohmic Behavior of Back Contact in ZnSnP2 Solar Cells by Inserting Cu3P Reviewed

    Taro Kuwano, Ryoji Katsube, Yoshitaro Nose

    2019 IEEE 46th Photovoltaic Specialist Conference (PVSC)   Vol. accepted   page: 3007 - 3009   2019

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    One of the main issues for the improvement of solar cells is to develop Ohmic contacts with low contact resistance on absorbers, such as CIGS/MoSe2/Mo. In the case of ZnSnP2 (ZTP)-based solar cells, Cu is used as a back electrode. At the Cu/ZTP interface, Cu3P is formed epitaxially on ZTP due to interdiffusion through annealing process and contributes to the improvement of the carrier transport property across the junction. However, the interdiffusion also causes degradation of electrodes and hence the increase in the series resistance. In this study, we adopt DC sputtering of a Cu3P target on the ZTP wafers before the deposition of Cu electrodes to prepare uniform Cu/Cu3P electrodes. As a result, the degradation of electrodes was suppressed and the low series resistance was obtained in the annealing time range from 5 to 30 min. The Cu/Cu3P stacked electrodes could therefore be a robust Ohmic contact for ZTP.

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  21. Reactive Epitaxial Formation of a Mg-P-Zn Ternary Semiconductor in Mg/Zn3P2 Solar Cells Reviewed

    Ryoji Katsube, Kenji Kazumi, Tomo Tadokoro, Yoshirato Nose

    ACS Applied Materials and Interfaces   Vol. 10   page: 36102 - 36107   2018.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acsami.8b11423

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  22. Investigation on Phase Equilibria in the Mg-P-Zn system Concerning Mg(Mg<inf>x</inf>Zn<inf>1-x</inf>)<inf>2</inf>P<inf>2</inf>/Zn<inf>3</inf>P<inf>2</inf>-Based Photovoltaics Reviewed

    Ryoji Katsube, Yoshitaro Nose

    2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)     2018.6

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/pvsc.2018.8547932

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  23. Ternary phosphide semiconductor in Mg/Zn3P2 solar cells Reviewed

    Ryoji Katsube, Kenji Kazumi, Yoshitaro Nose

    2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)     2017.6

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/pvsc.2017.8366757

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  24. Orientation of Zn3P2 films via phosphidation of Zn precursors Reviewed

    Ryoji Katsube, Yoshitaro Nose

    JOURNAL OF CRYSTAL GROWTH   Vol. 459   page: 95 - 99   2017.2

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Orientation of solar absorber is an important factor to achieve high efficiency of thin film solar cells. In the case of Zn3P2 which is a promising absorber of low-cost and high-efficiency solar cells, (110)/(001) orientation was only reported in previous studies. We have successfully prepared (101)-oriented Zn3P2 films by phosphidation of (0001)-oriented Zn films at 350 degrees C. The phosphidation mechanism of Zn is discussed through STEM observations on the partially-reacted sample and the consideration of the relationship between the crystal structures of Zn and Zn3P2. We revealed that (0001)-oriented Zn led to nucleation of (101)-oriented Zn3P2 due to the similarity in atomic arrangement between Zn and Zn3P2. The electrical resistivity of the (101)-oriented Zn3P2 film was lower than those of (110)/(001)-oriented films, which is an advantage of the phosphidation technique to the growth processes in previous works. The results in this study demonstrated that well-conductive Zn3P2 films could be obtained by controlling orientations of crystal grains, and provide a guiding principle for microstructure control in absorber materials.

    DOI: 10.1016/j.jcrysgro.2016.11.040

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  25. Thermodynamic considerations on interfacial reactivity concerning carrier transport characteristics in metal/p-Zn3P2 junctions Reviewed

    Ryoji Katsube, Yoshitaro Nose

    Journal of Materials Chemistry C   Vol. 5 ( 22 ) page: 5538 - 5543   2017

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry  

    Carrier transport across a metal/semiconductor interface plays a key role in electronic devices. It is generally affected by some interactions at interfaces, such as atomic interdiffusion and formation of intermediate compounds
    however, it is hard to consider all possible chemical reactions at the interface. In this work, we adopted a chemical potential diagram for comprehensive discussions on chemical reactions at the interfaces between the metal (M) and p-type zinc phosphide (p-Zn3P2), which is a promising candidate as an absorber in thin-film solar cells. We revealed that Schottky or Ohmic behavior depended on the reaction at the interfaces through the investigations in Al/p-Zn3P2 and Ag/p-Zn3P2 junctions. The interdiffusion was observed at the interface of Al/p-Zn3P2, while the interfacial structure in Ag/p-Zn3P2 was not changed by annealing. Such behaviors were thermodynamically expected from the chemical potential diagrams and determined the transport characteristics considering the similar work functions of Al and Ag. Furthermore, the discussions on other M-P-Zn (M = Au, In, Mn, Cu) systems based on chemical potential diagrams clarified that phosphide semiconductors as intermediate compounds were formed in the M/p-Zn3P2 junctions, which show Schottky behavior, and that Ohmic M/p-Zn3P2 junctions are stable. Therefore, it is concluded that we should discuss the band structures in heterojunctions under the considerations on reactivity at the interfaces, which is comprehensively understood using chemical potential diagrams.

    DOI: 10.1039/c7tc01047h

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  26. Growth and characterization of indium-doped Zn3P2 bulk crystals Reviewed

    Ryoji Katsube, Hiroyuki Hayashi, Akira Nagaoka, Kenji Yoshino, Yoshitaro Nose, Yasuharu Shirai

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 55 ( 4 )   2016.4

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    In this paper, we report the crystal growth of indium-doped zinc phosphide bulk crystals to obtain n-type conduction. The crystal growth experiments were carried out by unidirectional solidification from In-Zn-P ternary solution, and n-type Zn3P2 bulk crystals were successfully obtained. It was also revealed that the electrical properties of indium-doped Zn3P2 crystals could be controlled by heat treatment under controlled partial pressure of phosphorus or zinc. The relationship between the electron concentration and the partial pressure of zinc or phosphorus even in indium-doped Zn3P2 can be understood on the basis of defect equilibria, as in the case of undoped Zn3P2. However, the controllable range of the electron concentration was 10(10)-10(13)cm(-3), which was too low in terms of the concentration of doped indium. This is due to the low formation energy of the intrinsic acceptor, interstitial phosphorus, and carrier compensation should be discussed. According to recent reports on ab initio calculation, a weakly n-type Zn3P2 is expected to be formed under extremely Zn-rich growth conditions. The results obtained in this study coincide with the prediction based on calculations, and provide useful knowledge for the formation of the p-n junction of Zn3P2. (C) 2016 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.55.041201

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  27. Growth and characterization of Cu2ZnSn(SxSe1-x)(4) single crystal grown by traveling heater method Reviewed

    Akira Nagaoka, Ryoji Katsube, Shigeru Nakatsuka, Kenji Yoshino, Tomoyasu Taniyama, Hideto Miyake, Koichi Kakimoto, Michael A. Scarpulla, Yoshitaro Nose

    JOURNAL OF CRYSTAL GROWTH   Vol. 423   page: 9 - 15   2015.8

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    High-quality Cu(2)ZriSn(SxSe1-x)(4)(CZTS(x)Se(1-x)) single crystals were grown by the traveling heater method (THN1), which is an example of a solution growth process. The CZTS(x)Se(1-x) solute-Sn solvent pseudobinary system was investigated and the ranges of growth temperature and quantity of solvent were determined for THN1 growth. The CZTS(x)Se(1-x) Sel single crystals were obtained from a 70-80 mol% CZTS(x)Se(1-x), solution at growth temperature 900 degrees C and speed 4-5 mmiclay. The structural and compositional analyses of the grown single crystals were carried out by powder X-ray diffraction, Raman spectroscopy and electron probe microanalysis. The grown crystals were kesterite and nearly stoichiometric with slightly Cu poor and Zn-rich despite the excess Sn used as the solvent. As the sulfur content x increases, the carrier concentration increases slightly but systematically between 2 x 10(17) and 3 x 10(17) cm(-3) while the mobility decreases from 35.1 to 104 cm(2) V-1 s(-1). These data provide references for the results of characterization on thin film samples as well as giving insight into the defect equilibrium and resulting quantities such as doping and mobility affecting device performance. Published by Elsevier B.V.

    DOI: 10.1016/j.jcrysgro.2015.04.012

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MISC 2

  1. Fabrication process and device application of chalcopyrite phosphides based on thermodynamics Reviewed

    野瀬嘉太郎, 勝部涼司, 桑野太郎

    応用物理   Vol. 91 ( 5 ) page: 280 - 284   2022.5

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    DOI: 10.11470/oubutsu.91.5_280

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  2. 機械学習による相図作成の効率化 Reviewed

    田村 亮, 寺山 慧, 勝部 涼司, 野瀬 嘉太郎

    応用物理   Vol. 91 ( 2 ) page: 96 - 100   2022.2

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Presentations 143

  1. Solidification sequence of practical TiAl-based casting alloys

    Ryoji Katsube, Taka Narumi, Hideyuki Yasuda

    The 11th Pacific Rim International Conference on Advanced Materials and Processing (PRICM11)  2023.11.20 

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  2. 粒径100μm級の鉄鋼材料におけるδ-γ変態の巨大過冷

    勝部涼司, 大崎正裕, 土井実春, 鳴海大翔, 安田秀幸

    日本鉄鋼協会2023年秋期第186回講演大会  2023.9.20 

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  3. 液体金属の完全濡れ現象の探求とIII-V族りん化物製膜への展開

    勝部涼司, 今宿晋, 鳴海大翔, 安田秀幸

    第70回応用物理学会春季学術講演大会  2023.3.16 

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  4. Ti-48Al-2Cr-2Nb合金の凝固組織: BCC + HCP協調的デンドライト

    勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2023年春期第172回講演大会  2023.3.10 

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  5. Solidification phenomena in CrMnFeCoNi and related alloys revealed by X-ray imaging techniques

    Ryoji Katsube, Shigehiro Tokuri, Takumi Tomiyama, Keita Nakano, Litian Luo, Taka Narumi, Hideyuki Yasuda

    International Workshop on High-entropy Alloys  2023.2.14 

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  6. ハイエントロピー合金の凝固組織形成: Cantor合金とその派生系に着目して

    勝部涼司, 土久里成弘, 冨山拓己, Luo Litian, 中野敬太, 鳴海大翔, 安田秀幸

    2022年度応用物理学会多元化合物・太陽電池研究会年末講演会  2022.12.16 

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  7. TiAl基合金の凝固過程の時間分解三次元観察

    勝部涼司, 野々村真誉, 鳴海大翔, 安田秀幸

    日本金属学会2022年秋期第171回講演大会  2022.9.23 

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  8. Formation of binary phosphide films for photovoltaics via phosphidation of precisely-controlled metallic precursors Invited

    Ryoji Katsube, Yoshitaro Nose

    The 8th Asian Conference on Crystal Growth and Crystal Technology  2021.3.2 

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  9. 金属溶媒を利用した 第二族元素含有三元リン化物半導体の開拓

    勝部 涼司, 原田 航, 大場 史康, 野瀬 嘉太郎

    第66回応用物理学会春季学術講演会  2019.3.10 

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  10. Ternary phosphide semiconductor in Mg/Zn3P2 solar cells International conference

    Ryoji Katsube, Kenji Kazumi, Yoshitaro Nose

    IEEE PVSC-44  2017.6.29 

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  11. Thermodynamic Assessments of Reactivity at Metal/p-Zn3P2 Interfaces: Relationship between Interface Structure and Carrier Transport Behavior International conference

    Ryoji Katsube, Yoshitaro Nose

    IUMRS-ICAM2017  2017.8.30 

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  12. 三元化合物MgxZnyP2形成に伴うMg/p-Zn3P2太陽電池の特性評価

    勝部 涼司, 鹿住 健司, 野瀬 嘉太郎

    第14回「次世代の太陽光発電システム」シンポジウム  2017.7.20 

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  13. 化合物半導体 Zn3P2の III-V 族リン化物半導体との固溶体形成

    勝部 涼司, 野瀬 嘉太郎, 白井 泰治

    第53回セラミックス基礎科学討論会  2015.1.9 

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  14. 機械学習を援用した効率的な ZnSnP2成膜条件探索

    勝部 涼司, 寺山 慧, 田村 亮, 野瀬 嘉太郎

    第17回「次世代の太陽光発電システム」シンポジウム  2020.10.15 

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  15. 機械学習を援用した効率的な相図構築 -ZnSnP2成膜を例に

    勝部 涼司, 寺山 慧, 田村 亮, 野瀬 嘉太郎

    第67回応用物理学会春季学術講演会  2020.3.14 

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  16. 異原子価金属リン化物間の固溶体Zn3(1-x)M2xP2 (M = Al, Ga, In) の固溶限, 結晶構造, および発光

    勝部 涼司, 鹿住 健司, 峯元 高志, 野瀬 嘉太郎

    2018.3.17 

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  17. 薄膜太陽電池のバッファ層を指向したIIA-Zn-P系化合物群の探索

    勝部 涼司, 野瀬 嘉太郎

    第79回応用物理学会秋季学術講演会  2018.9.19 

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  18. 酸化物薄膜上における液体In の完全濡れの機構解明: 任意基板上III-V 族化合物成膜に向けて

    勝部 涼司, 辻 創太, 桑野 太郎, Yang Yuming, 野瀬 嘉太郎

    第81回応用物理学会秋季学術講演会  2020.9.10 

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  19. 金属/p-Zn3P2接合における界面反応と電子輸送特性

    勝部 涼司, 野瀬 嘉太郎

    第77回応用物理学会秋季学術講演会  2016.9.14 

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  20. 金属/p-Zn3P2接合における界面反応と電子輸送特性との相関

    勝部 涼司, 野瀬 嘉太郎

    第1回フロンティア太陽電池セミナー  2016.11.17 

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  21. 金属/Zn3P2界面における反応拡散と電子輸送特性

    勝部 涼司, 野瀬 嘉太郎, 白井 泰治

    材料物性工学談話会平成27年度第2回講演会ならびにポスター発表会  2016.1.27 

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  22. 金属Zn薄膜のリン化による高配向Zn3P2薄膜の作製

    勝部 涼司, 野瀬 嘉太郎, 白井 泰治

    第63回応用物理学会春季学術講演会  2016.3.21 

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  23. Templated-Liquid-Phase (TLP) 法によるInP成膜におけるキャップ・下地各層の潜在的機能の解明

    勝部 涼司, Yang Yuming, 野瀬 嘉太郎

    第66回応用物理学会春季学術講演会  2019.3.10 

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  24. FORMATION OF A NOVEL MG-P-ZN TERNARY SEMICONDUCTOR: A KEY MATERIAL OF EFFICIENCY ENHANCEMENT IN Zn3P2-BASED SOLAR CELLS International conference

    Ryoji Katsube, Kenji Kazumi, Yoshitaro Nose

    27th International Photovoltaic Science and Engineering Conference (PVSEC-27)  2017.11.15 

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  25. Growth and electric properties of n-type Zn3P2 bulk crystals International conference

    Ryoji Katsube, Akira Nagaoka, Yoshitaro Nose, Kenji Yoshino, Yasuharu Shirai

    2nd Japan-Korea Joint Symposium on Compound Semiconductor Solar Cells  2015.1.29 

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  26. Investigation on Phase Equilibria in the Mg-P-Zn system Concerning Mg(MgxZn1-x)2P2-Based Photovoltaics International conference

    Ryoji Katsube, Yoshitaro Nose

    WCPEC-7  2018.6.13 

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  27. Mg-P-Zn三元系化合物の不定比性と結晶構造の解明

    勝部 涼司, 野瀬 嘉太郎

    第78回応用物理学会秋季学術講演会  2017.9.5 

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  28. Mg/Zn3P2太陽電池における新規Mg-P-Zn系化合物

    勝部 涼司, 野瀬 嘉太郎

    第64回応用物理学会春季学術講演会  2017.3.15 

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  29. pnictide/pnictide ヘテロ接合に向けた新規三元リン化物半導体の探索

    勝部 涼司, 野瀬 嘉太郎

    第15 回 「次世代の太陽光発電システム」シンポジウム  2018.7.12 

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  30. Snを溶媒としたMg(MgxZn1-x)2P2の作製と光学的特性評価

    勝部 涼司, 前田 毅, 和田 隆博, 野瀬 嘉太郎

    第78回応用物理学会秋季学術講演会  2017.9.7 

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  31. Ferrite-Austenite Transformation During/After Solidification in Steels Observed by Time-Resolved Tomography and X-ray Diffractometry

    Yanxin Wang, Masahiro Ohsaki, Taka Narumi, Ryoji Katsube, Hideyuki Yasuda

    The 16th Japan-China Symposium on Science and Technology of Iron and Steel  2024.6.10 

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  32. 超高純度Fe-CおよびFe-C-Si合 金のグラファイト形態変化に及ぼすMgの影響

    杉山明, タロック澪, 安田秀幸, 鳴海大翔, 勝部涼司

    日本鋳造工学会 第183回全国講演大会  2024.5.26 

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  33. 固液共存域における引張変形に及ぼす組織の影響

    庄司雄大, 沼田泰佑, 鳴海大翔, 安田秀幸, 勝部涼司

    日本鋳造工学会 第183回全国講演大会  2024.5.26 

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  34. 時間分解CTによるバルクAl-Cu合金のデンドライト組織の観察に基づいた温度履歴が液相の透過率に及ぼす寄与の検討

    中埜創太, 鳴海大翔, 安田秀幸, 勝部涼司

    日本鋳造工学会 第183回全国講演大会  2024.5.26 

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  35. 時間分解X線トモグラフィによるバルクの Al-Cu合金固液共存体の変形過程の定量解析

    鳴海大翔, 沼田泰佑, 庄司雄大, 笹田智也, 安田秀幸, 勝部涼司

    日本鋳造工学会 第183回全国講演大会  2024.5.26 

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  36. Time-resolved X-ray diffraction measurement of austenite coarsening after a massive-like transformation in Fe-0.45C steel

    Yanxin Wang, Masahiro Osaki, Taka Narumi, Ryoji Katsube, Hideyuki Yasuda

    2024.3.14 

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  37. Crystallographic analysis of the austenite grains after a massive-like transformation in carbon steel using 4D-CT+XRD

    Osaki Masahiro, Katsube Ryoji, Narumi Taka, Yasuda Hideyuki

    2024.3.14 

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  38. Crystal orientation analysis of bcc-hcp coexisting dendrites in solidifying TiAl-based alloys

    Imoto Yuki, Katsube Ryoji, Narumi Taka, Yasuda Hideyuki

    2024.3.14 

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  39. Three-dimensional observation of semisolid Al-Cu alloy during tensile test using synchrotron X-ray CT

    Yuta Shoji, Taisuke Numata, Taka Narumi, Ryoji Katsube, Hideyuki Yasuda

    2024.3.13 

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  40. Influence of thermal history on the dendritic structures in Al-10mass%Cu bulk alloys

    Sota Nakano, Taka Narumi, Ryoji Katsube, Hideyuki Yasuda

    2024.3.13 

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  41. Elucidating the phase transformation sequences from the α phases in TiAl-based alloys

    Yuki Imoto, Ryoji Katsube, Taka Narumi, Hideyuki Yasuda

    2024.3.13 

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  42. Solidification microstructures of the Cr-Mn-Fe-Co-Ni alloys with BCC-FCC transformations

    Ayato Egawa, Takumi, Tomiyama, Taka Narumi, Hideyuki Yasuda

    2024.3.13 

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  43. Quantifying deformation microstructure inside semisolid Al-Cu alloy using fast synchrotron tomography

    Taka Narumi, Taisuke Numata, Yuta Shoji, Ryoji Katsube, Hideyuki Yasuda

    MRM2023/IUMRS-ICA2023  2023.12.15 

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  44. Solidification and Subsequent Phase Transformations in TiAl-based alloys: An In-situ Time-Resolved X-ray Tomography and X-ray Diffraction Study

    Ryoji Katsube, Yuki Imoto, Taka Narumi, Hideyuki Yasuda

    MRM2023/IUMRS-ICA2023  2023.12.15 

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  45. Time-resolved and in-situ observation of solidification in Fe–22mass%Mn–0.7mass%C alloy using X-ray imaging techniques

    Taka Narumi, Kengo Fujita, Makoto Ohta, Ryoji Katsube, Hideyuki Yasuda

    The 11th Pacific Rim International Conference on Advanced Materials and Processing (PRICM11)  2023.11.21 

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  46. Time-resolved in-situ X-ray tomography/diffractometry of solidification and phase transformation in γ-TiAl alloys

    Ryoji Katsube, Yuki Imoto, Taka Narumi, Hideyuki Yasuda

    Korea-Japan Joint Symposium on Titanium  2023.10.26 

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  47. 超高純度Fe-CおよびFe-C-Si合金に晶出するグラファイトの形態変化

    杉山明, タロック澪, 安田秀幸, 鳴海大翔, 勝部涼司

    日本鋳造工学会 第182回全国講演大会  2023.10.21 

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  48. X線トモグラフィーを用いたAl-Cu合金の固液共存域に特有なせん断変形の定量解析

    庄司雄大, 鳴海大翔, 勝部涼司, 安田秀幸

    日本鋳造工学会 第182回全国講演大会  2023.10.22 

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  49. 時間分解三次元観察を用いたAl-Cu合金の液相透過率の評価と冷却条件の関係

    中埜創太, 鳴海大翔, 勝部涼司, 安田秀幸, 杉山明

    日本鋳造工学会 第182回全国講演大会  2023.10.22 

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  50. Al-Cu合金の固液共存体の圧縮過程で起きる不均一変形の定量解析

    沼田泰佑, 鳴海大翔, 勝部涼司, 安田秀幸

    日本金属学会2023年秋期第173回講演大会  2023.9.22 

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  51. 粒径100μm級鉄鋼材料のマッシブ的変態におけるδ-γ相間の結晶方位関係

    大崎正裕, 勝部涼司, 鳴海大翔, 安田秀幸

    日本鉄鋼協会2023年秋期第186回講演大会  2023.9.20 

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    Event date: 2023.9

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  52. 時間分解CTを用いたバルクの固液共存体の変形組織の解析

    鳴海大翔, 沼田泰佑, 庄司雄大, 勝部涼司, 安田秀幸

    日本鉄鋼協会2023年秋期第186回講演大会  2023.9.21 

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  53. Fe-22Mn-0.7C合金の凝固過程におけるγ粒間の結晶方位関係

    藤田健吾, 安田秀幸, 鳴海大翔, 勝部涼司

    日本鉄鋼協会2023年秋期第186回講演大会  2023.9.20 

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  54. Al-10mass%Cu合金デンドライト組織に及ぼす温度履歴の影響

    中埜創太, 西口ありさ, 鳴海大翔, 勝部涼司, 安田秀幸

    日本金属学会2023年秋期第173回講演大会  2023.9.22 

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  55. 種々のTi/Al比を有するTi-Al合金の凝固・相変態過程の解明

    井本侑樹, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2023年秋期第173回講演大会  2023.9.22 

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  56. 機械学習における回帰手法を援用したCr-Mn-Fe-Co-Ni系におけるミクロ偏析フリー組成の探索

    土久里成弘, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2023年秋期第173回講演大会  2023.9.20 

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  57. その場観察に基づくAl-Cr-Fe-Co-Ni合金の凝固組織形成過程の理解と制御

    江川彩斗, 片岡宏樹, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2023年秋期第173回講演大会  2023.9.20 

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  58. X線トモグラフィによるバルクのAl-Cu合金固液共存体におけるせん断帯形成の解明

    庄司雄大, 沼田泰佑, 鳴海大翔, 勝部涼司, 安田秀幸

    日本金属学会2023年秋期第173回講演大会  2023.9.22 

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  59. HCP構造を有するMg-Zn合金のデンドライトアームの成長方位

    西口ありさ, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2023年秋期第173回講演大会  2023.9.22 

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  60. 3D observation of microstructure evolution and casting defect formation during solidification in Al and Mg Alloy Invited

    Hideyuki Yasuda, Arisa Nishiguchi, H Xue, Ryoji Katsube, Taka Narumi

    10th international light metals technology conference (LMT2023)  2023.7.10 

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    Event date: 2023.7

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  61. In situ observation of solidification in peritectic steels and evaluation of the strains induced in the solidifying shell

    Hideyuki Yasuda, Taka Narumi, Ryoji Katsube, Yukihiro Nanri

    16th international conference on Modeling of casting, welding and advanced solidification processes (MCWASP XVI)  2023.6.19 

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  62. Reconstruction of dendritic growth by fast tomography and phase field filtering

    Hideyuki Yasuda, Arisa Nishiguchi, Haoyan Xue, Minori Nonomura, Keita Nakano, Ryoji Katsube, Taka Narumi, Tomohiro Takaki

    16th international conference on Modeling of casting, welding and advanced solidification processes (MCWASP XVI)  2023.6.22 

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  63. 鋳造欠陥につながる固液共存体の不均一変形の4D-CTを用いた三次元 その場観察

    沼田泰佑, 鳴海大翔, 勝部涼司, 安田秀幸

    公益社団法人日本鋳造工学会 第181回全国講演大会  2023.5.21 

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  64. 超高純度Fe-C合金に晶出する グラファイトの形態変化に及ぼす添 加元素の影響

    杉山明, タロック澪, 安田秀幸, 鳴海大翔, 勝部涼司

    公益社団法人日本鋳造工学会 第181回全国講演大会  2023.5.20 

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  65. HCP構造Mg-Zn合金のデンドラ イトの時間分解三次元観察

    西口ありさ, 勝部涼司, 鳴海大翔, 安田秀幸

    公益社団法人日本鋳造工学会 第181回全国講演大会  2023.5.21 

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  66. 時間分解CTによるAl-Cu合金の 凝固組織のゆらぎとマクロ偏析への 影響

    薛浩妍, 西口ありさ, 鳴海大翔, 勝部涼司, 上杉健太朗

    公益社団法人日本鋳造工学会 第181回全国講演大会  2023.5.21 

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  67. デンドライトアームの変形により誘起される分断現象の時間分解透過X線イメージング観察

    鳴海大翔, 太田誠, 勝部涼司, 安田秀幸

    日本鉄鋼協会2023年春期第185回講演大会、  2023.3.9 

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  68. 時間分解X線回折測定を用いたFe-18Cr-20Ni合金の過冷凝固過程における準安定フェライト選択の実証

    藤田健吾, 安田秀幸, 鳴海大翔, 勝部涼司

    日本鉄鋼協会2023年春期第185回講演大会  2023.3.9 

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  69. 時間分解X線イメージングを用いたFe–22Mn–0.7C合金の凝固パスの解明と非金属介在物による準安定フェライトの核生成制御を活用した凝固組織制御

    鳴海大翔, 藤田健吾, 太田誠, 勝部涼司, 安田秀幸

    日本鉄鋼協会2023年春期第185回講演大会  2023.3.8 

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  70. 非等モル組成 Cr-Mn-Fe-Co-Ni合金におけるデンドライトの優先成長方位

    土久里成弘, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2023年春期第172回講演大会  2023.3.10 

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  71. 4D-CT によるAl-10mass%Cuバルク試料の凝固組織の評価

    薛浩妍, 鳴海大翔, 安田秀幸, 勝部涼司, 西口ありさ

    日本金属学会2023年春期第172回講演大会  2023.3.10 

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  72. HCP構造Mg−Zn合金のデンドライトの時間分解三次元観察

    西口ありさ, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2023年春期第172回講演大会  2023.3.10 

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  73. Al-Cu合金の固液共存体の圧縮試験におけるせん断帯の形成過程の解析

    沼田泰佑, 鳴海大翔, 勝部涼司, 安田秀幸

    日本金属学会2023年春期第172回講演大会  2023.3.10 

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  74. 鋳造組織の微細化を目指した時間分解X線イメージングを用いた変形によるAl-Cuデンドライトの分断過程の解析

    太田誠, 鳴海大翔, 勝部涼司, 安田秀幸

    令和4年度日本鋳造工学会関西支部秋季講演大会  2022.12.9 

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  75. Fragmentation of Dendrite Arms and Grain Refining: In-Situ Observation Using Synchrotron Radiation X-Rays Invited

    Hideyuki Yasuda, Taka Narumi, Ryoji Katsube

    International Workshop on Electromagnetic Metallurgy and Material Science with High Magnetic Field  2022.10.31 

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    Event date: 2022.10

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  76. Direct Observation of Microstructure Evolution During Solidification in Cast Steel and Cast Iron by Synchrotron X-ray Imaging Techniques Invited

    Hideyuki Yasuda, Akira Sugiyama, Taka Narumi, Ryoji Katsube

    74th World Foundry Congress  2022.10.16 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  77. マッシブ的なδ-γ変態により凝固シェルに生じるひずみ

    安田秀幸, 鳴海大翔, 勝部涼司

    日本鉄鋼協会2022年秋期第184回講演大会  2022.9.23 

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  78. Tiを添加したFe-22Mn-0.7C合金の凝固過程その場観察

    鳴海大翔, 藤田健吾, 太田誠, 勝部涼司, 安田秀幸

    日本鉄鋼協会2022年秋期第184回講演大会  2022.9.22 

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  79. デンドライトアームの変形により誘起される分断現象

    太田誠, 鳴海大翔, 沼田泰介, 勝部涼司, 安田秀幸

    日本鉄鋼協会2022年秋期第184回講演大会  2022.9.23 

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  80. Fe-22Mn-0.7C鋼の凝固過程における準安定フェライトの選択

    藤田健吾, 鳴海大翔, 勝部涼司, 安田秀幸

    日本鉄鋼協会2022年秋期第184回講演大会  2022.9.23 

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  81. 変形によるAl-Cuデンドライトの多結晶化の4D-CT/XRDを用いたその場観察

    沼田泰佑, 太田誠, 鳴海大翔, 勝部涼司, 安田秀幸

    日本金属学会2022年秋期第171回講演大会  2022.9.23 

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  82. Mo-Nb-Ta-V-W合金におけるミクロ偏析低減の可能性とBCC二相分離

    土久里成弘, 中野敬太, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2022年秋期第171回講演大会  2022.9.22 

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  83. Cr-Mn-Fe-Co-Cu合金の凝固・固相変態による組織形成の特徴

    冨山拓己, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2022年秋期第171回講演大会  2022.9.22 

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  84. HCP構造Zn−Al合金のデンドライトの定量的観察

    西口ありさ, 野々村真誉, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2022年秋期第171回講演大会  2022.9.23 

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  85. Quantitative Observation of Dendritic Growth in Metallic Alloys by Time-Resolve and In-situ Tomography Invited

    Hideyuki Yasuda, Minori Nonomura, Taka Narumi, Ryoji Katsube, Yukihiro Nanri, Sota Tsuji

    6th International Congress on 3D Materials Science  2022.6.27 

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  86. Observation of grain motion during semisolid deformation by using 4D-CT and 3DXRD

    Taka Narumi, Koki Ohta, Makoto Ohta, Taisuke Numata, Kentaro Asahi, Ryoji Katsube, Hideyuki Yasuda

    6th International Conference on Advances in Solidification Processes  2022.6.23 

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  87. Microstructure evolution induced by the solidification and the ferrite - austenite massive-like in Fe-C and Fe-Cr-Ni alloys

    Hideyuki Yasuda, Taka Narumi, Ryoji Katsube, Yukihiro Nanri, Sota Tsuji

    6th International Conference on Advances in Solidification Processes  2022.6.24 

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  88. 4D-CTを用いたAl-Cu合金の固液共存体の圧縮変形におけるポロシティ形成のその場観察

    鳴海大翔, 大田滉貴, 太田誠, 勝部涼司, 安田秀幸

    軽金属学会2022年第142回大会  2022.5.29 

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  89. 放射光を用いたAl-Cu合金固液共存体の変形の時間分解・三次元その場観察

    鳴海大翔, 大田滉貴, 太田誠, 沼田泰祐, 朝日健太郎, 勝部涼司, 安田秀幸

    日本鋳造工学会2022年第179回全国講演大会  2022.5.22 

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  90. 透過X線イメージングによるFe-22Mn-0.7C合金の凝固過程その場観察

    鳴海大翔, 藤田健吾, 太田誠, 勝部涼司, 安田秀幸

    日本鉄鋼協会2022年春期第183回講演大会  2022.3.17 

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  91. 時間分解X線イメージング(2D/3D)による 凝固過程のダイナミクスの解明 Invited

    安田秀幸, 鳴海大翔, 勝部涼司, 高木知弘, 森下浩平, 南里幸宏, 辻創太, 野々村真誉

    日本金属学会2022年春期第170回講演大会  2022.3.16 

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  92. 種々のZn濃度でのAl-Zn合金におけるデンドライト成長の定量解析

    鳴海大翔, 野々村真誉, 西口ありさ, 勝部涼司, 安田秀幸

    日本金属学会2022年春期第170回講演大会  2022.3.17 

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  93. 等モルCr-Mn-Fe-Co-Ni合金の凝固パスに基づくCr-Fe-Co-Ni系合金の偏析フリー組成探索

    冨山拓己, 勝部涼司, 鳴海大翔, 安田秀幸

    日本金属学会2022年春期第170回講演大会  2022.3.17 

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  94. 4D-CTによるAl-Cu合金の固液共存体の圧縮過程の定量解析

    鳴海大翔, 大田滉貴, 勝部涼司, 安田秀幸

    日本金属学会2022年春期第170回講演大会  2022.3.17 

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  95. 0.18C鋼の凝固・δ-γ変態におけるサイズ効果: δ-γ変態しない凝固条件の発見

    土井実春, 勝部涼司, 辻創太, 南里宏幸, 鳴海大翔, 安田秀幸

    日本鉄鋼協会2022年春期第183回講演大会  2022.3.17 

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  96. 4D-CTとXRDによる純鉄及びFe-C合金の体積・格子定数の温度変化測定

    鳴海大翔, 南里宏幸, 勝部涼司, 安田秀幸

    日本鉄鋼協会2022年春期第183回講演大会  2022.3.17 

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  97. Characterization of dendritic growth in Cr-Mn-Fe-Co-Ni and Cr-Fe-Co-Ni alloys

    Hideyuki Yasuda、Taka Narumi, *Ryoji Katgsube, Keita Nakano, Takumi Tomiyama,

    Materials Research Meeting 2021  2021.12.14 

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    Event date: 2021.12

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  98. Time-resolved and in-situ observations of Solidification in Ductile Cast Iron

    Kiattisaksri Chatcharit, Akira Sugiyama, Kohei Morishita, Taka Narumi, Ryoji Katsube, Hideyuki Yasuda

    12th International Symposium on Science and Processing of Cast Iron (SPCI-XII) 

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    Event date: 2021.11

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  99. Solidification sequence in ductile cast iron: time-resolved and in-situ X-ray imaging

    Hideyuki Yasuda, Kiattisaksri Chatcharit, Akira Sugiyama, Kohei Morishita, Taka Narumi, Ryoji Katsube

    12th International Symposium on Science and Processing of Cast Iron (SPCI-XII) 

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  100. CrMnFeCoNi系、CrMnFeCoCu系ハイエントロピー合金の凝固パスと相選択 Invited

    安田 秀幸, 勝部 涼司, 鳴海 大翔, Luo Litian, 中野 敬太, 冨山 拓己

    日本金属学会第169回秋季講演大会  2021.9.16 

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  101. 4D-CT/3DXRDによるAl-Cu合金の固液共存体の圧縮過程の定量解析

    大田 滉貴, 鳴海 大翔, 勝部 涼司, 安田 秀幸

    日本金属学会第169回秋季講演大会  2021.9.15 

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  102. 4D-CTと3DXRDによる高固相率のAl-Cu合金等軸晶の固液共存体の変形過程のその場観察

    鳴海大翔, 大田滉貴, 太田誠, 勝部涼司, 安田 秀幸

    日本金属学会第169回秋季講演大会  2021.9.15 

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  103. Biドープによるn-SnSe薄膜の作製

    石谷 康平, 勝部 涼司, 野瀬 嘉太郎

    第82回応用物理学会秋季学術講演会  2021.9.11 

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  104. 炭素鋼におけるマッシブ的変態後のγ粒の粗大化に及ぼすTiの影響

    辻創太, 鳴海大翔, 勝部涼司, 安田秀幸

    日本鉄鋼協会第182回秋季講演大会  2021.9.2 

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  105. Fe-18Cr-11Ni合金のマッシブ的変態後のγ粒粗大化に及ぼす残留δ相の影響

    鳴海大翔, 市田晃大, 勝部涼司, 安田秀幸

    日本鉄鋼協会第182回秋季講演大会  2021.9.2 

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  106. 蒸留を用いたSn(S,Se)固溶体の単結晶成長

    石谷 康平, 勝部 涼司, 野瀬 嘉太郎

    資源・素材学会関西支部 第17回「若手研究者・学生のための研究発表会」  2020.12.11 

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    Event date: 2020.12

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  107. 高純度SnSを用いた薄膜太陽電池の作製

    武村 友輝, 勝部 涼司, 野瀬 嘉太郎

    第80回応用物理学会秋季学術講演会  2019.9.19 

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  108. Ti-S鎖状構造を有する硫化物半導体Sr9Ti8S24の合成と熱電特性評価

    田部 考治, 勝部 涼司, 野瀬 嘉太郎

    第78回応用物理学会秋季学術講演会  2017.9.6 

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  109. Time-resolved 2D and 3D Observation of Microstructure Evolution during Solidification and Subsequent Cooling in Steels

    Hideyuki Yasuda, Taka Narumi, Ryoji Katsube, Yukihiro Nanri, Sota Tsuji

    Asia Steel 2021  2021.12.8 

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  110. Zn3P2/BaSi2ヘテロ接合太陽電池に向けたダイオード特性評価

    高橋 一真, 勝部 涼司, 黒川 康良, 野瀬 嘉太郎, 宇佐美 徳隆

    第1回フロンティア太陽電池セミナー  2016.11.17 

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  111. ZnSnP2吸収層/Cu電極界面へのCu3Pの挿入による太陽電池の直列抵抗低減と変換効率向上 Invited

    桑野 太郎, 勝部 涼司, 野瀬 嘉太郎

    第80回応用物理学会秋季学術講演会  2019.9.19 

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  112. ZnSnP2吸収層とCu裏面電極との接合の界面構造とキャリア輸送

    桑野 太郎, 勝部 涼司, 野瀬 嘉太郎

    第79回応用物理学会秋季学術講演会  2018.9.19 

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  113. ZnSnP2太陽電池の裏面電極構造

    桑野 太郎, 勝部 涼司, 野瀬 嘉太郎

    第16回「次世代の太陽光発電システム」シンポジウム  2019.7.4 

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  114. ホットプレス法によるSrTiS3の作製

    上水樽 昂樹, 永岡 章, 勝部 涼司, 野瀬 嘉太郎, 吉野 賢二

    第​10​回​半​導​体​材​料​・​デ​バ​イ​ス​フ​ォ​ー​ラ​ム  2018.10.20 

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  115. リン化法によるCdSnP2薄膜の作製

    井上 亮輔, 中塚 滋, 勝部 涼司, 野瀬 嘉太郎, 白井 泰治

    資源素材学会関西支部 第12回 若手研究者・学生のための研究発表会  2015.12.11 

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  116. 低融点金属溶媒を利用した (Ge,Sn)Sの作製

    市川 智士, 勝部 涼司, 野瀬 嘉太郎

    第81回応用物理学会秋季学術講演会  2020.9.9 

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  117. 凝固組織の定量観察を目指した時間分解三次元観察の応用

    安田秀幸, 鳴海大翔, 勝部涼司, 高木知弘

    日本鉄鋼協会2021年度高温プロセス部会若手フォーラム第二回研究会  2021.11.19 

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  118. 前駆体の濡れ性制御による高平坦性InPの成膜

    楊 宇明, 勝部 涼司, 野瀬 嘉太郎

    第79回応用物理学会秋季学術講演会  2018.9.19 

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  119. 化学ポテンシャルを制御した硫化スズ(II)(SnS)の成膜

    岩田 晃樹, 勝部 涼司, 中塚 滋, 野瀬 嘉太郎

    第78回応用物理学会秋季学術講演会  2017.9.7 

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  120. 単相SnSを用いた薄膜太陽電池セルの作製

    武村 友輝, 勝部 涼司, 桑野 太郎, 野瀬 嘉太郎

    第16回「次世代の太陽光発電システム」シンポジウム  2019.7.4 

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  121. 反応拡散を利用したSnSの成膜

    岩田 晃樹, 勝部 涼司, 中塚 滋, 野瀬 嘉太郎

    第2回フロンティア太陽電池セミナー  2017.11.30 

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  122. 反応拡散を利用した硫化スズ(II)(SnS)の成膜

    岩田 晃樹, 勝部 涼司, 中塚 滋, 野瀬 嘉太郎

    第64回応用物理学会春季学術講演会  2017.3.15 

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  123. 新規熱電硫化物半導体II-Ti-S系化合物の探索

    田部 考治, 勝部 涼司, 野瀬 嘉太郎

    資源・素材学会関西支部「第14回若手研究者・学生のための研究発表会」  2017.12.15 

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  124. 時間分解トモグラフィと結晶方位解析によるAl-Cu合金デンドライトの変形と溶断のその場観察

    太田誠, 鳴海大翔, 大田滉貴, 勝部涼司, 安田秀幸

    軽金属学会第141回秋季大会  2021.11.13 

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  125. 気相成長法を用いたSnS単相バルク結晶作製

    武村 友輝, 勝部 涼司, 野瀬 嘉太郎

    第15 回 「次世代の太陽光発電システム」シンポジウム  2018.7.12 

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  126. 相平衡に基づく化合物太陽電池の研究-リン化物を例に

    野瀬 嘉太郎, 勝部 涼司

    第67回応用物理学会春季学術講演会  2020.3.12 

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  127. 錫モノカルコゲナイド混晶Sn(S,Se) の単結晶作製

    石谷 康平, 武村 友輝, 勝部 涼司, 野瀬 嘉太郎

    第81回応用物理学会秋季学術講演会  2020.9.10 

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  128. SnS単相バルク結晶作製と電気特性評価

    武村 友輝, 勝部 涼司, 野瀬 嘉太郎

    第79回応用物理学会秋季学術講演会  2018.9.19 

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  129. 4D-CTと3DXRDを用いたAl-Cu合金等軸晶の固液共存体の変形のその場観察

    鳴海大翔, 大田滉貴, 太田誠, 勝部涼司, 安田秀幸

    軽金属学会第141回秋季大会  2021.11.13 

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  130. Al-Cu合金の固液共存体の変形によるポロシティ・割れの形成過程の時間分解・三次元その場観察

    鳴海大翔, 大田滉貴, 太田誠, 勝部涼司, 安田秀幸, 杉山明

    日本鋳造工学会関西支部第33回関西鋳造懇話会  2022.3.15 

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  131. Al-Cu合金の固液共存体の変形による鋳造欠陥の形成過程の三次元・時間分解その場観察

    鳴海大翔, 大田滉貴, 太田誠, 勝部涼司, 安田秀幸, 杉山明

    日本鋳造工学会関西支部令和3年度 秋季支部講演大会  2021.12.2 

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  132. Cu(InGa)Se2バルク結晶のオフストイキオメトリー制御と物性

    藤田 わかば, 勝部 涼司, 野瀬 嘉太郎, 吉野 賢二, 池田 茂

    第16回「次世代の太陽光発電システム」シンポジウム  2019.7.4 

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  133. CuGaSe2単結晶光電極による水の還元反応

    藤田 わかば, 吉野 賢二, 勝部 涼司, 野瀬 嘉太郎, 原田 隆史, 池田 茂

    第81回応用物理学会秋季学術講演会  2020.9.9 

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  134. Development of ZnSnP2-based Photovoltaic Devices Invited International conference

    Yoshitaro NOSE, Shigeru NAKATSUKA, Taro KUWANO, Ryoji KATSUBE

    European Materials Research Society (E-MRS) 2019 Spring Meeting  2019.5.27 

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  135. Fe-S系新規化合物半導体Fe2SnS4の合成

    黒飛 昇, 勝部 涼司, 野瀬 嘉太郎, 白井 泰治

    平成27年度資源・素材学会関係学協会合同秋季大会  2015.9.9 

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  136. Growth and electrical characterization of SnS single crystals International conference

    Tomoki Takemura, Ryoji Katsube, Yoshitaro Nose

    International Symposium on Solar Energy Material  2019.1.25 

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  137. Improvement of Ohmic Behavior of Back Contact in ZnSnP2 Solar Cells by Inserting Cu3P International conference

    Taro KUWANO, Ryoji KATSUBE, Yoshitaro NOSE

    46th IEEE Photovoltaic Specialists Conference (PVSC 46)  2019.6.21 

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  138. Mg(MgxZn1-x)2P2 : A Key Material in Zn3P2-Based Photovoltaics International conference

    Ryoji Katsube, Kenji Kazumi, Yoshitaro Nose

    International Symposium on Solar Energy Material  2019.1.25 

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  139. PLおよびDLTS測定によるZnSnP2バルク結晶の欠陥評価

    桑野 太郎, 勝部 涼司, Steven Johnston, Adele Tamboli, 野瀬 嘉太郎

    第81回応用物理学会秋季学術講演会  2020.9.9 

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  140. Se処理によるCuGaSe2単結晶の光電気化学性能の向上

    藤田 わかば, 吉野 賢二, 勝部 涼司, 野瀬 嘉太郎, 池田 茂

    第67回応用物理学会春季学術講演会  2020.3.14 

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  141. SiOx/In/MoOx積層膜のリン化メカニズム

    Yang Yuming, 勝部 涼司, 野瀬 嘉太郎

    資源素材学会関西支部 第15回 若手研究者・学生のための研究発表会  2018.12.13 

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  142. Sn-SnS二相試料を蒸発源に用いたSnS単相薄膜作製

    武村 友輝, 勝部 涼司, 野瀬 嘉太郎

    第79回応用物理学会秋季学術講演会  2018.9.19 

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  143. SnSバルク単結晶作製と電気特性評価

    武村 友輝, 勝部 涼司, 野瀬 嘉太郎

    第3回フロンティア太陽電池セミナー  2018.12.13 

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Other research activities 1

  1. 村田学術振興財団 研究者海外派遣援助

    2018.6

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Research Project for Joint Research, Competitive Funding, etc. 2

  1. 100μm級の粒径で顕在化する鉄鋼材料のδ-γ変態におけるサイズ効果

    2023.4 - 2025.3

    日本鉄鋼協会  第32回 鉄鋼研究振興助成 

    勝部涼司

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3000000

  2. 酸化モリブデン薄膜上における完全濡れ液体金属薄膜の探求

    Grant number:0341065-A  2022.4 - 2023.3

    2022年度 単年度研究助成 

    勝部涼司

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\1500000

KAKENHI (Grants-in-Aid for Scientific Research) 5

  1. Design of high-entropy casting alloys via elucidation of diverse solidification processes caused by the large degree of freedom

    Grant number:22K14522  2022.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

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    Authorship:Principal investigator 

    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

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  2. Elucidating mechanism of perfect wetting behavior of liquid indium on molybdenum oxide films

    Grant number:19K23573  2019.8 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity start-up  Grant-in-Aid for Research Activity start-up

    Katsube Ryoji

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    Authorship:Principal investigator 

    Grant amount:\2860000 ( Direct Cost: \2200000 、 Indirect Cost:\660000 )

    Liquid indium (In) shows perfect wetting behavior on molybdenum oxide (MoOx) films despite of the fact that liquid metals generally tend to form droplets because of large surface tension. This study aims to reveal the wetting mechanism of this unique liquid-metal/oxide system.
    We investigated the wetting behaviors of liquid In on the MoOx films with various oxygen content, x. As a result, we revealed that perfect wetting occurs when x is close to 3. We also detected the formation of (111)-oriented indium oxide (In2O3) at the interface between In and MoOx in the case where MoOx is perfectly wetted by liquid In. Furthermore, we found that liquid In shows dewetting on amorphous In2O3 films. According to the above results, we conclude that the key factor of the perfect wetting phenomenon in In/MoOx system is the formation of (111)-oriented In2O3 through chemical reaction at the interface.

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  3. Quantitative analysis of solidification phenomena using unstructured data obtained by time-resolved tomography

    Grant number:22H04963  2022.4 - 2027.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)  Grant-in-Aid for Scientific Research (S)

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    Authorship:Coinvestigator(s) 

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  4. Quantitative analysis of solidification dynamics by time-resolved in-situ observations

    Grant number:22H00264  2022.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s) 

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  5. Modeling of solidification dynamics supported by 3D time-resolved in-situ observations

    Grant number:17H06155  2017.5 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)  Grant-in-Aid for Scientific Research (S)

    Yasuda Hideyuki

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    Authorship:Coinvestigator(s) 

    It has been required to understand solidification phenomena in metallic alloys based on direct observation. However, there were still limitations to the direct observations. In this study, time-resolved computed tomography (4D-CT), which uses the synchrotron radiation X-rays, and a thermodynamic-based reconstruction procedure, was developed to observe microstructure evolution during dendritic solidification in Sn, Al, Ni and Fe alloys. The developed technique allowed us to perform the two-dimensional and the three-dimensional observations. An alternative solidification and transformation mode was found in steel solidification, and the transformation significantly influenced the microstructure evolution of austenite grains. In addition, the formation mechanism of graphite nodules in cast iron, and the deformation mechanism of semisolid during solidification were studied using the developed technique.

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Industrial property rights 1

  1. 高純度カルコゲナイド材料及びその製造方法

    野瀬 嘉太郎, 武村 友輝, 勝部 涼司

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    Application no:特願2018-130688  Date applied:2018.7

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Teaching Experience (On-campus) 1

  1. Experiments 1

    2024

Teaching Experience (Off-campus) 2

  1. Materials Science Laboratory and Exercise 2

    2021.10 - 2024.1 Kyoto University)

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  2. Materials Science Laboratory and Exercise 1

    2021.4 - 2023.7 Kyoto University)

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Academic Activities 3

  1. 日本太陽光発電学会学術講演会 プログラム委員

    Role(s):Planning, management, etc.

    2024.4

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    Type:Academic society, research group, etc. 

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  2. 日本金属学会2023年秋期(第173回)講演大会 公募シンポジウムS3 ハイエントロピー合金の材料科学(X) テーマ責任者

    Role(s):Planning, management, etc.

    2023.9

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    Type:Competition, symposium, etc. 

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  3. 第三回フロンティア太陽電池セミナー 実行委員

    Role(s):Planning, management, etc.

    2018.12

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    Type:Competition, symposium, etc. 

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