Faculty Profiles - ITOH Takashi

Papers - ITOH Takashi

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Fabrication of Tilted Mg₂Si/Ni Multilayer Composite Modules Utilizing Polylactic Acid Resin Molds and Evaluation of The Thermoelectric Power Generation Performance Reviewed

Tomohiro KUSUMOTO, Yasuyoshi KUROKAWA, Noritaka USAMI, Takashi ITOH

J. Jpn. Soc. Powder Powder Metallurgy Vol. 72 ( Supplement ) page： S1269 - S1273 2025.3

Thermoelectric properties of Mg₂Si thin films prepared by thermal evaporation of Mg and face-to-face annealing Reviewed

Kurokawa, Y; Sato, K; Shibata, K; Kato, S; Miyamoto, S; Gotoh, K; Itoh, T; Usami, N

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING Vol. 163 page： 107552 2023.8

Performance enhancement of droplet-based electricity generator using a CYTOP intermediate layer Reviewed

Wang Haitao, Kurokawa Yasuyoshi, Gotoh Kazuhiro, Kato Shinya, Yamada Shigeru, Itoh Takashi, Usami Noritaka

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 62 ( SC ) page： 1 - 6 2023.4

Morphology and Thermoelectric Properties of Mg_3+δSb₂ Foams Manufactured Using Combustion Synthesis Reviewed

Koga Takashi, Itoh Takashi

MATERIALS TRANSACTIONS Vol. 64 ( 4 ) page： 835 - 840 2023.4

Improved conversion efficiency of p-type BaSi₂/n-type crystalline Si heterojunction solar cells by a low growth rate deposition of BaSi₂ Reviewed

Michinobu Fujiwara, Kazuma Takahashi, Yoshihiko Nakagawa, Kazuhiro Gotoh, Takashi Itoh, Yasuyoshi Kurokawa, Noritaka Usami

AIP Advances Vol. 12 ( 4 ) page： 045115 2022.4

Fabrication of heterojunction crystalline Si solar cells with BaSi₂ thin films prepared by a two-step evaporation method Reviewed

Yoshihiko Nakagawa, Kazuma Takahashi, Michinobu Fujiwara, Kosuke O. Hara, Kazuhiro Gotoh, Yasuyoshi Kurokawa, Takashi Itoh, Takashi Suemasu, Noritaka Usami

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 60 ( 10 ) page： 105503-1 - 105503-6 2021.10

燃焼合成を利用して作製したMg_3+δSb₂発泡体の形態と熱電特性 Reviewed

古賀誉史, 伊藤孝至

粉体および粉末冶金 Vol. 68 ( 9 ) page： 399 - 404 2021.9

Trends in Development of Thermoelectric Power Generation Materials for Vehicle Invited Reviewed

Systems, Control and Information Vol. 65 ( 6 ) page： 201 - 206 2021.6

Quantitative Analysis on Influence of Structural Conditions on Thermoelectric Properties of Tilted Rod-Ni/Mg2Si Composites Based on Finite Element Simulation Reviewed

Itoh Takashi

MATERIALS TRANSACTIONS Vol. 62 ( 2 ) page： 246 - 251 2021

Synthesis of Mg₂Si thin film by thermal treatment under inert gas atmosphere and evaluation of film quality Reviewed

Issei Horiba, Michinobu Fujiwara, Yoshihiko Nakagawa, Kazuhiro Gotoh, Yasuyoshi Kurokawa, Takashi Itoh and Noritaka Usami

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 59 page： SFFB03-1 - SFFB03-5 2020.4

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

We report on the synthesis of Mg₂Si thin films from a Mg-Si solution by thermal treatment of Mg on a Si substrate under an Ar gas atmosphere. The Mg was prepared by two methods. One is to deposit Mg films by thermal evaporation, and another is to simply place Mg ribbons on Si. After thermal treatment, a two-layer structure consisting of oxide and ~1 μm-thick Mg₂Si films with {100} preferential orientation was observed for the sample prepared by thermal evaporation. On the other hand, ~10 μm-thick single layer Mg₂Si with more random orientations and cracks was formed for the Mg ribbon contact samples. Possible mechanisms for different structures, crystal orientations, and crack formation are discussed.

DOI： 10.35848/1347-4065/ab6b79

Web of Science

Other Link： https://iopscience.iop.org/article/10.35848/1347-4065/ab6b79/meta

Optimization of Degreasing-Sintering Process for Mg₂Si/PLA Mixture and Influences of Additive Amount of Al on Sintered Density and Thermoelectric Performance of Mg₂Si Fabricated by the Optimized Process Reviewed

Takashi Itoh, Takumi Nakano

MRS Advances Vol. 5 ( 10 ) page： 459 - 467 2020

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

Fused deposition modelling (FDM) type of 3D printing is widely used for manufacturing complex shaped polymer products. Recently, the metal/polymer composite products can be made by 3D printer using metal/polymer composite filament. Now, we are planning to develop a new manufacturing process of the thermoelectric (TE) elements or modules by combining the FDM-type 3D printing and the degreasing-sintering process. In this work, we focused on the degreasing-sintering process of the mixture of Mg₂Si and polylactic acid (PLA) powders. Mg₂Si compound powder was synthesized by a liquid-solid phase reaction (LSPR) method. The powder mixtures of Mg₂Si, Al and PLA were pressed and heated in a pulse discharge sintering (PDS) chamber under a vacuum in various degreasing conditions. Following the degreasing, the sintering of Mg₂Si was carried out in the same PDS chamber at various starting sintering temperatures. Sintered density, Seebeck coefficient and electrical resistivity of the consolidated Mg₂Si were measured and the power factor as a TE performance was estimated from the TE properties. The optimum conditions of degreasing-sintering process maximizing the sintered density and the TE performance of Al-doped Mg₂Si were investigated. Furthermore, the influences of the additive amount of Al on the sintered density and the TE performance of Mg₂Si fabricated via the optimized degreasing-sintering process were investigated.

DOI： 10.1557/adv.2020.87

Web of Science

横方向熱電効果を有する Ni/Mg₂Si複合材料の熱電特性に関する有限要素シミュレーション解析 Reviewed

伊藤孝至

粉体および粉末冶金 Vol. 66 ( 2 ) page： 80-88 2019.2

有限要素シミュレーションに基づく傾斜棒状Ni/Mg₂Si複合材料の熱電特性に及ぼす構造条件の影響に関する定量解析 Reviewed

伊藤孝至

粉体および粉末冶金 Vol. 65 ( 11 ) page： 713-718 2018.11

Finite Element Simulation on Thermoelectric Performance of Tilted Mg₂Si/Ni Multilayer Composites Reviewed

Takashi Itoh

J. Jpn Soc. Powder and Powder Metallurgy Vol. 65 ( 3 ) page： 154-157 2018.3

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

Mg₂Si is a promising n-type thermoelectric (TE) material for TE power generation using waste heat with temperature range of 300 to 600^oC. Construction of multilayer composites with Mg₂Si and metallic material brings anisotropy in TE properties and enhancement in mechanical properties. The transverse TE force is created by giving vertical temperature difference in the tilted anisotropic TE material (transverse TE effect). In this study, the tilted Mg₂Si/Ni multilayer composites were focused on, and the influences of the structural conditions on the TE performance were investigated using a finite element simulation (FES). The simulations were carried out using two types of element models of the multilayer composites with different thickness ratio and tilt angle of Mg₂Si layer under the same temperature conditions of 500^oC (hot side) and 100^oC (cold side). The output power of the multilayer composites as a TE performance was calculated from the open-circuit voltage and the internal resistance estimated using FES. The values changed with the thickness ratio and the tilt angle. The optimum structural conditions of thickness ratio and the tilt angle which maximized the output power of the tilted multilayer composites were found out.

DOI： 10.2497/jjspm.65.154

有限要素シミュレーションを用いたMg₂Si/Ni傾斜積層複合材料の熱電特性および性能の解析 Reviewed

伊藤孝至

粉体および粉末冶金 Vol. 64 ( 9 ) page： 501-509 2017.9

Cobalt and Iron Doping Effects on Thermoelectric Properties of Higher Manganese Silicides Prepared by Mechanical Milling and Pulse Discharge Sintering Reviewed

Takashi Itoh, Shinya Uebayashi

J. Jpn Soc. Powder and Powder Metallurgy Vol. 63 ( 7 ) page： 491-496 2016.7

Influence of Pulverization and CaO Nanoparticles Addition on Thermoelectric Properties and Grain Growth of Mg₂Si Based Compound Reviewed

Takashi Itoh, Akira Tominaga

Materials Transactions Vol. 57 ( 7 ) page： 1088-1093 2016.7

Thermoelectric Properties of Al-doped Mg₂Si Compounds Prepared via Three Kinds of Process for Grain Refinement Reviewed

Takashi Itoh, Akira Tominaga

MRS Advances Vol. 1 ( Issue 60 ) page： 3989 - 3995 2016.5

Thermoelectric Properties of Crystal Aligned Higher Manganese Silicide Fabricated by Solidification under Magnetic Field Reviewed

Kazushige Yamauchi, Takeshi Hagio, Tomoya Mitsuo, Kazuhiko Iwai, Takashi Itoh

Japanese Journal of Applied Physics Vol. 54 ( 11 ) page： 117102-1-6 2015.10

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

MnSi_1.73 is a promising p-type thermoelectric material for use in the intermediate-temperature region owing to its high oxidation resistance. Its thermoelectric properties are highly dependent on crystallographic direction and control of crystal alignment is thus important for polycrystalline MnSi_1.73. On the other hand, solidification under magnetic fields has been reported to directly yield crystal aligned structures in various alloys. Here, a 3T magnetic field was imposed during solidification of MnSi_1.73 for the first time. X-ray diffraction analysis indicated that polycrystalline MnSi_1.73 with c-axes aligned perpendicularly to the magnetic field was successfully obtained. The Seebeck coefficient slightly decreased while the electrical conductivity increased more than twofold along the magnetic field direction compared with those of the sample solidified without the magnetic field, which reflected the trend of a single crystal. The power factor reached a maximum of 2.09×10^-4 W m^-1K^-2 at 771 K; however, this was about one-fifth of that of a single crystal. Improvement in electrical conductivity by prevention of crack formation shall realize high performance expected from the crystal aligned structure.

DOI： 10.7567/JJAP.54.117102

Mg₂Si系化合物の熱電特性と粒成長に及ぼす粉砕とCaOナノ粒子添加の影響 Reviewed

伊藤孝至, 富永　彰

粉体および粉末冶金 Vol. 62 ( 3 ) page： 114-119 2015.3

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Papers - ITOH Takashi