2025

Invited talks

Taiwan Consortium of Emergent Crystalline Materials (TCECM) (May 9-10, Yilan)

• “Preparation of Mg₂Sn and Mg₂Ge Single Crystals for Thermoelectric Application “
  Kei Hayashi (Invited poster)

2025 Taiwan-Japan Workshop on Crystal Growth, Analysis and Calculation (TJ-CGAC) (May 7-9, Yilan)

• “Development of single crystalline Mg₂Sn and Mg₂Ge thermoelectrics with engineered lattice defects”
  Kei Hayashi (Invited lecture)

16th Pacific Rim Conference on Ceramic and Class Technology including Glass & Optical Materials Division Metting (GOMD 2025) (May 4-9, Vancouver)

• “Data-driven approach to find potential Fe-based half-Heusler thermoelectric materials for the near-room-temperature applications”
  Yuzuru Miyazaki (Invited lecture)

Conferences

the 41st International Conference on Thermoelectrics (& 7th Asian Conference on Thermoelectrics) ICT/ACT2025 (June 15-19, Sendai)

• “Process and composition optimization strategies on promising Cu₂-II-IV-S₄ based TE materials”
  C. Bourges, R. Al Rahal Al Orabi, Y. Miyazaki, G. Lambard, N. Sato, M. Tachibana, S. Ishii, T. Mori (oral)
• “Graphene-Assisted Electronic DOS Modulation and Phonon Scattering to Improve the Thermoelectric Performance of Mg₃Sb₂-Based Materials”
  Qiang Zhang, Jiadang Li, Nagendra S. Chauhan, Zhicheng Huang, Wenhao Fan, Kei Hayashi, Shaoping Chen, Yuzuru Miyazaki (oral)
• “Thermoelectric enhancement in half-metallic full-Heusler Mn₂VAl alloy through control of nonstoichiometry”
  Kei Hayashi, Gakuto Kanno, Hezhang Li, Zhicheng Huang, Jing-Feng Li, Yuzuru Miyazaki (oral)
• “Enhancement of Thermoelectric Properties in P-Type V_0.6Ti_0.4FeSb Alloys via Point Defects Engineering”
  Zhicheng Huang, Xue Nan, Hiroaki Konishi, Kei Hayashi, Yuzuru Miyazaki (oral)
• “Data-driven approach for potential iron-based half-Heusler thermoelectrics with chemical bonding characteristics”
  Xue Nan, Kei Hayashi, Zhicheng Huang, Yuzuru Miyazaki (poster)
• “Chemical bond engineering towards optimal-performance V_1-xTi_xCo_1-yFeySb half-Heusler thermoelectrics”
  Xue Nan, Kei Hayashi, Hiroaki Konishi, Zhicheng Huang, Yuzuru Miyazaki (poster)
• “Preparation and Thermoelectric Properties of Doubly-substituted Fe-based Half-Heusler Alloys (V_1-xTi_x)(Fe_1-yCoy)Sb”
  Hiroaki Konishi, Xue Nan, Zhicheng Huang, Kei Hayashi and Yuzuru Miyazaki (poster)
• “Preparation and thermoelectric properties of Mg₂Sn single crystals grown under high Ar pressure”
  Kazuki Murayama, Kei Hayashi, Zhicheng Huang, Yuzuru Miyazaki (poster)
• “Preparation and Thermoelectric Properties of Partially-substituted Chimney-ladder Compounds (Fe_1-xCo_x)Ge_γ (γ~1.52)”
  Tatsuhiro Kurosawa, Zhicheng Huang, Kei Hayashi, Yuzuru Miyazaki (poster)
• “Characterization of thermoelectric single leg using high-performance Mg₂Sn-based single crystal”
  Shin Sato, Kei Hayashi, Zhicheng Huang, Yuzuru Miyazaki (poster)
• “Formation of magnesium monovacancies by Sb doping into Mg₂Sn crystals”
  Mamoru Kitaura, Takuma Sumi, Yoshitaka Taira, Shinta Watanabe, Zhicheng Huang, Kei Hayashi, Yuzuru Miyazaki, Koji Michishio, Manabu Ishizaki, Akimasa Ohnishi (poster)
• “Design of Oxide Thermoelectric Uni-leg Modules”
  Yoshimi Shimizu, Kei Hayashi, and Yuzuru Miyazaki (poster)

2024

Awards

• Nan Xue　40th International Conference on Thermoelectrics (ICT2024)
  The ICT2024 Outstanding Poster Prize
  “First-Principles Study for High Thermoelectric Performance Iron-based Half Heusler Compounds with Thermodynamic and Mechanical Stability”

Papers

• “Dislocation Introduction via Domain Engineering in Mg₂Sn Single Crystal to Improve its Thermoelectric Properties“
  Zhicheng Huang, Kei Hayashi, Wataru Saito, Hezhang Li, Jun Pei, Jinfeng Dong, Toshiaki Chiba, Xue Nan, Bo-Ping Zhang, Jing-Feng Li, Yuzuru Miyazaki
  Small Methods 2500385 (2025).
• “Insights into enhanced thermoelectric performance of the n-type Mg₃Sb₂-based materials by amphoteric Al doping“
  Qiang Zhang, Huijun Li, Nagendra S. Chauhan, Lifei Wang, Wenhao Fan, Shaoping Chen, Jianfeng Fan, Yuzuru Miyazaki
  Materials Today Energy 44(4), 101656 (2024).
• “Ultralow thermal conductivity and high ZT of Cu₂Se-based thermoelectric materials mediated by TiO_2-n nanoclusters“
  Jincheng Yu, Xiaodong Liu, Haihua Hu, Yilin Jiang, Hua-Lu Zhuang, Hezhang Li, Bin Su, Jing-Wei Li, Zhanran Han, Zhengqin Wang, Lu Chen, Kei Hayashi, Yuzuru Miyazaki, B. Layla Mehdi, Jing-Feng Li
  Joule, 8(9), 2652 (2024).
• “ Sr-substitution effects on crystal structure and thermoelectric properties of misfit layered cobaltate, [Ca₂CoO₃]_pCoO₂“
  Yoshimi Shimizu, Kei Hayashi and Yuzuru Miyazaki
  Solid State Science 152, 107536 (2024).

Invited talks

2025 16th International Conference on Materials and Manufacturing Technologies (March 21-23, Sendai)

• “Data-driven approach to find potential Fe-based half-Heusler thermoelectric materials for the near-room-temperature applications”
  Yuzuru Miyazaki (Invited lecture)

New Zealand–Japan Workshop on Emerging Solid-State Technology for Low-Enthalpy Energy Harvesting (November 11-12, Wellington)

• “Defect engineering to enhance thermoelectric performance of Mg₂Sn and Mg₂Ge single crystals”
  Kei Hayashi (Invited lecture)

14th International Conference on Ceramic Materials and Components for Energy and Environmental Systems (CMCEE14) (August 18-22, Budapest)

• “Laqce defect engineering for high-performance Mg₂Sn and Mg₂Ge thermoelectric single crystals”
  Kei Hayashi (Invited lecture)

40th International Conference on Thermoelectrics (June 30- July 4, Krakow)

• “Bond-engineering to Develop High-performance Fe-based Half-Heusler Alloys”
  Yuzuru Miyazaki (Invited lecture)

Europian Materials Research Society 2024 Spring Meeting (May 27-31, Strasbourg)

• “Fe-based Half Heusler Thermoelectric Materials”
  Yuzuru Miyazaki (Invited lecture)

Conferences

40th International Conference on Thermoelectrics (June 30- July 4, Krakow)

• “Enhanced p-type thermoelectric properties of Mg₂Ge single crystals via lattice defect engineering”
  K. Hayashi, H. Tajeuchi, Z. Huang, N. S. Chauhan, Q. Zhang, X. Nan, H. Li, J. Pei, J. Dong, B.-P. Zhang, J.-F. Li, Y. Miyazaki (Oral)
• “Enhancement of Thermoelectric Properties in p-type Iron-based Half-Heusler VFeSb Alloys via Titanium Alloying”
  Z. Huang, K. Hayashi, X. Nan, H. Konishi, Y. Miyazaki (Oral)
• “First-Principles Study for High Thermoelectric Performance Iron-based Half-Heusler Compounds with Thermodynamic and Mechanical Stability”
  X. Nan, Z. Huang, K. Hayashi, H. Konishi, Y. Miyazaki (Poster)