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Reduction in the thermal conductivity of Heusler-type thermoelectric material thin film by controlling structural defects

Research Project

Project/Area Number 18K13789
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 21050:Electric and electronic materials-related
Research InstitutionOsaka University

Principal Investigator

Yamada Shinya  大阪大学, 基礎工学研究科, 助教 (30725049)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsホイスラー合金 / 熱電変換材料 / 薄膜 / 熱伝導率
Outline of Final Research Achievements

Fe-based Heusler alloys such as Fe2VAl and Fe2TSi have been expected as a next-generation thermoelectric material to replace Bi-Te compounds from the viewpoint of not containing toxic elements. In this project, for applications as a potential thermoelectric material, we examined the possibility of improvement in thermoelectric performance of thin-film Fe-based Heusler alloys. First, we experimentally find that the presence of the V-Si antisite defect in the Si-substituted Fe2VAl films contributes to the significant reduction in the thermal conductivity. Second, we experimentally clarified the room-temperature Seebeck coefficient and thermal conductivity values of 101 uV/K and 5.6 W/(mK), respectively, for the Fe2TiSi films. These results will open a new way for Fe-based full-Heusler alloy thermoelectric materials.

Academic Significance and Societal Importance of the Research Achievements

Fe系フルホイスラー合金は,低環境負荷で高い熱電性能が期待されている一方,その作製の難しさから,信頼性の高い薄膜作製技術の開発や物性評価が十分に行われてこなかった.本研究は,Fe系フルホイスラー合金薄膜の作製技術の確立,電気・熱電特性の制御を実証した点に加えて,これまで議論されてこなかった熱電物性を制御する新たな手法を提言した.低環境負荷の新しい熱電変換材料の薄膜の高性能化の指針を提示した点に,産業,学術面の両方で大変意義のある研究であるといえる.

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (8 results)

All 2020 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (4 results)

  • [Int'l Joint Research] ヨーク大学(英国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Thermoelectric properties of single-phase full-Heusler alloy Fe2TiSi films with D03-type disordering2020

    • Author(s)
      Shimanuki Y.、Kudo K.、Ishibe T.、Masago A.、Yamada S.、Nakamura Y.、Hamaya K.
    • Journal Title

      Journal of Applied Physics

      Volume: 127 Issue: 5 Pages: 055106-055106

    • DOI

      10.1063/1.5141949

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Significant reduction in the thermal conductivity of Si-substituted Fe2VAl epilayers2019

    • Author(s)
      K. Kudo, S. Yamada, J. Chikada, Y. Shimanuki, T. Ishibe, S. Abo, H. Miyazaki, Y. Nishino, Y. Nakamura, K. Hamaya
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 5 Pages: 054201-054201

    • DOI

      10.1103/physrevb.99.054201

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Direct observation of pseudo-gap electronic structure in the Heusler-type Fe2VAl thin film2019

    • Author(s)
      H. Miyazaki, S. Tateishi, M. Matsunami, K. Soda, S. Yamada, K. Hamaya, Y. Nishino
    • Journal Title

      Journal of Electron Spectroscopy and Related Phenomena

      Volume: 232 Pages: 1-4

    • DOI

      10.1016/j.elspec.2018.12.003

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 熱電ホイスラー合金Fe2TiSiエピタキシャル薄膜の電気・熱電特性2020

    • Author(s)
      工藤 康平、嶋貫 雄太、石部 貴史、 真砂 啓、 山田 晋也、中村 芳明、 浜屋 宏平
    • Organizer
      第166回日本金属学会春季講演大会東京工業大学 大岡山キャンパス
    • Related Report
      2019 Annual Research Report
  • [Presentation] 熱電材料Fe2TiSiエピタキシャル薄膜の低温MBE成長2019

    • Author(s)
      嶋貫雄太, 工藤康平, 山田晋也, 石部貴史, 中村芳明, 浜屋宏平
    • Organizer
      第80回応用物理学会秋季学術講演大会、北海道大学 札幌キャンパス
    • Related Report
      2019 Annual Research Report
  • [Presentation] Si置換したFe2VAlエピタキシャル薄膜の熱伝導率2019

    • Author(s)
      工藤康平, 山田晋也, 近田尋一朗, 嶋貫雄太, 石部貴史, 阿保智, 宮崎秀俊, 西野洋一, 中村芳明, 浜屋宏平
    • Organizer
      第66回応用物理学会春季学術講演大会、東京工業大学 大岡山キャンパス
    • Related Report
      2018 Research-status Report
  • [Presentation] Electrical and thermoelectric properties of single-crystalline Fe2VAl films2018

    • Author(s)
      K. Kudo, S. Yamada, R. Okuhata, J. Chikada, Y. Shimanuki, Y. Nakamura,and K. Hamaya
    • Organizer
      第2回フォノンエンジニアリング研究グループ研究会、KKRホテル熱海
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2021-02-19  

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