Faculty Profiles - ASAHI Ryoji

Papers - ASAHI Ryoji

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Improvement of the open-circuit voltage of CU2ZnSnS4 cells using a two-layered process Reviewed

Tajima Shin, Itoh Tadayoshi, Hazama Hirofumi, Ohishi Keiichiro, Asahi Ryoji

2014 IEEE 40TH PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) page： 431 - 434 2014

Effects of viscosity, surface tension, and evaporation rate of solvent on dry colloidal structures: A lattice Boltzmann study Reviewed

Munekata Toshihisa, Suzuki Takahisa, Yamakawa Shunsuke, Asahi Ryoji

PHYSICAL REVIEW E Vol. 88 ( 5 ) page： 052314 2013.11

Phase-Field Modeling of Phase Transformations in Platinum-Based Alloy Nanoparticles Reviewed

Yamakawa Shunsuke, Asahi Ryoji, Koyama Toshiyuki

MATERIALS TRANSACTIONS Vol. 54 ( 8 ) page： 1242 - 1249 2013.8

Language：English Publishing type：Research paper (other academic) Publisher：Materials Transactions

A phase-field model that describes the phase decomposition and phase transformations inside platinum-based alloy nanoparticles is developed to elucidate the effects of particle size, alloy composition, and heat-treatment temperature on the microstructure formation. FePt, CoPt, NiPt, CuPt and IrPt binary alloy nanoparticles with diameters of less than 10 nm are investigated. The calculation results clearly show that surface segregation and atomic ordering are sensitive to the alloy components and particle size, and that the equilibrium nanostructure obtained varies according to the balance between the surface energy and chemical interaction between atomic components. Platinum-based alloy nanoparticles are expected to find applications as electrocatalysts in polymer electrolyte fuel cells. Thus, the proposed phase-field approach demonstrates its usefulness for the control of the radial distributions of each alloying component within a nanoparticle, leading to improvements in the activity and durability of the catalyst and reducing the required amount of platinum loading.

DOI： 10.2320/matertrans.ME201304

Web of Science

Scopus

Numerical study of Li diffusion in polycrystalline LiCoO2 Reviewed

Yamakawa Shunsuke, Yamasaki Hisatsugu, Koyama Toshiyuki, Asahi Ryoji

JOURNAL OF POWER SOURCES Vol. 223 page： 199 - 205 2013.2

1611 Effect of Microstructure on Li Diffusivity of Polycrystalline LiCoC_2

Yamakawa Shunsuke, Yamasaki Hisatsugu, Ide Kazuto, Asahi Ryoji, Koyama Toshiyuki

The Proceedings of The Computational Mechanics Conference Vol. 2013 ( 0 ) page： _1611 - 1_-_1611-2_ 2013

2415 A hybrid quantum-classical simulation study on the interaction effects between Li-ions for those diffusion in graphite

OHBA Nobuko, OGATA Shuji, KOUNO Takahisa, KOBAYASHI Ryo, TAMURA Tomoyuki, ASAHI Ryoji

The Proceedings of The Computational Mechanics Conference Vol. 2013 ( 0 ) page： _2415 - 1_-_2415-2_ 2013

Model GW study of the late transition metal monoxides Reviewed

Ye Lin-Hui, Asahi Ryoji, Peng Lian-Mao, Freeman Arthur J.

JOURNAL OF CHEMICAL PHYSICS Vol. 137 ( 15 ) page： 154110 2012.10

Optically Tunable Amino-Functionalized Graphene Quantum Dots Reviewed

Tetsuka Hiroyuki, Asahi Ryoji, Nagoya Akihiro, Okamoto Kazuo, Tajima Ichiro, Ohta Riichiro, Okamoto Atsuto

ADVANCED MATERIALS Vol. 24 ( 39 ) page： 5333 - 5338 2012.10

Thermoelectric Properties of Off-Stoichiometric Ti-Ni-Sn Half-Heusler Systems Reviewed

Hazama Hirofumi, Matsubara Masato, Asahi Ryoji

JOURNAL OF ELECTRONIC MATERIALS Vol. 41 ( 6 ) page： 1730 - 1734 2012.6

Enhanced Thermal Diffusion of Li in Graphite by Alternating Vertical Electric Field: A Hybrid Quantum-Classical Simulation Study Reviewed

Ohba Nobuko, Ogata Shuji, Tamura Tomoyuki, Kobayashi Ryo, Yamakawa Shunsuke, Asahi Ryoji

Journal of the Physical Society of Japan Vol. 81 ( 2 ) page： 23601 - 23601 2012.2

Enhanced Thermal Diffusion of Li in Graphite by Alternating Vertical Electric Field: A Hybrid Quantum-Classical Simulation Study Reviewed

Ohba Nobuko, Ogata Shuji, Tamura Tomoyuki, Kobayashi Ryo, Yamakawa Shunsuke, Asahi Ryoji

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 81 ( 2 ) 2012.2

Ideal tensile and shear strength of a gum metal approximant: Ab initio density functional calculations Reviewed

Nagasako Naoyuki, Asahi Ryoji, Hafner Juergen

PHYSICAL REVIEW B Vol. 85 ( 2 ) 2012.1

1111 Phase-Field Study of Compositional Variation within Bimetallic Nanoparticle

Yamakawa Shunsuke, Sakurai Shogo, Asahi Ryoji, Koyama Toshiyuki

The Proceedings of The Computational Mechanics Conference Vol. 2012 ( 0 ) page： 68 - 69 2012

2110 Hybrid quantum-classical simulation with DC-RGDFT on thermal diffusion of Li in Graphite

OHBA Nobuko, OGATA Shuji, KOUNO Takahisa, KOBAYASHI Ryo, TAMURA Tomoyuki, ASAHI Ryoji

The Proceedings of The Computational Mechanics Conference Vol. 2012 ( 0 ) page： 191 - 192 2012

First-principles study of Cu2ZnSnS4 and the related band offsets for photovoltaic applications Reviewed

Nagoya A., Asahi R., Kresse G.

JOURNAL OF PHYSICS-CONDENSED MATTER Vol. 23 ( 40 ) 2011.10

A hybrid quantum-classical simulation study on stress-dependence of li diffusivity in graphite Reviewed

Ohba N.

CMES - Computer Modeling in Engineering and Sciences Vol. 75 ( 3-4 ) page： 247 - 264 2011.9

Improvement of thermoelectric properties for half-Heusler TiNiSn by interstitial Ni defects Reviewed

Hazama Hirofumi, Matsubara Masato, Asahi Ryoji, Takeuchi Tsunehiro

JOURNAL OF APPLIED PHYSICS Vol. 110 ( 6 ) 2011.9

Temperature-induced martensitic phase transitions in gum-metal approximants: First-principles investigations for Ti3Nb Reviewed

Lazar Petr, Jahnatek Michal, Hafner Juergen, Nagasako Naoyuki, Asahi Ryoji, Blaas-Schenner Claudia, Stoehr Markus, Podloucky Raimund

PHYSICAL REVIEW B Vol. 84 ( 5 ) 2011.8

Computational Materials Design for High-performance Thermoelectrics Reviewed

ASAHI Ryoji, HAZAMA Hirofumi, NAGASAKO Naoyuki, MATSUBARA Masato

Ceramics Japan Vol. 46 ( 6 ) page： 505 - 509 2011.6

Fabrication of Nanocomposite Thermoelectric Materials by a Pulsed Laser Deposition Method Reviewed

Matsubara Masato, Azuma Hirozumi, Asahi Ryoji

JOURNAL OF ELECTRONIC MATERIALS Vol. 40 ( 5 ) page： 1176 - 1180 2011.5

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Papers - ASAHI Ryoji