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Development of high-mobility thermoelectric clathrates with controlled nanoblock structure consisting of functional cages

Research Project

Project/Area Number 18K04703
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26020:Inorganic materials and properties-related
Research InstitutionYamaguchi University

Principal Investigator

Kishimoto Kengo  山口大学, 大学院創成科学研究科, 助教 (50234216)

Co-Investigator(Kenkyū-buntansha) 赤井 光治  山口大学, 国際総合科学部, 教授 (20314825)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords熱電材料 / クラスレート化合物 / 電子構造 / キャリア伝導 / 伝導経路 / キャリア移動度
Outline of Final Research Achievements

In order to develop good functional cage networks, we have investigated carrier transport and thermoelectric properties of type-I clathrates Ba8M16Ge30 (M = Al, Ga, In) by combining sample preparation and characterization experiments with theoretical discussions using electronic structure calculations. On the basis of this understanding, several new clathrate compounds were prepared and characterized for the development of high-performance thermoelectric materials. Their electronic structures were also calculated. Thermoelectric power generation modules using the clathrate compounds were fabricated, resulting in a conversion efficiency of 8.4 % for a high temperature of 700 K and a temperature difference of 400 K. We have also developed thermoelectric materials besides clathrates, focusing on their high carrier mobility.

Academic Significance and Societal Importance of the Research Achievements

学術的意義としては,ゲスト-ホスト構造をもつ半導体のキャリア伝導の取り扱い方法を提示したことである。クラスレート化合物では,従来,ホスト-ホスト間の伝導のみが強調されすぎていたが,実際にはゲスト-ホスト間の混成軌道もキャリア伝導を担っていることを示した。また,ゲスト原子のラトリング振動がキャリア伝導に及ぼす影響については,これまでほとんど議論されていなかったが,ある程度の理解を与えることができた。社会的意義としては,高性能な熱電材料および熱電発電モジュールを開発したことである。熱電発電は,各種排熱から電気エネルギーを生み出すことができ,エネルギー問題解決の一助となりうる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (16 results)

All 2021 2020 2019 2018

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (11 results)

  • [Journal Article] Thermoelectric properties of type-I clathrate Na8Ga8Ge382021

    • Author(s)
      Riku Takeshita, Kengo Kishimoto, Hironori Asada, Koji Akai
    • Journal Title

      Journal of Solid State Chemistry

      Volume: 294 Pages: 121911-121911

    • DOI

      10.1016/j.jssc.2020.121911

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Synthesis and some properties of Ba24-x(Ga,Sn)136 (x ~ 4) type-II clathrates2020

    • Author(s)
      Kazuki Kawasaki, Kengo Kishimoto, Hironori Asada, Koji Akai
    • Journal Title

      Journal of Solid State Chemistry

      Volume: 290 Pages: 121540-121540

    • DOI

      10.1016/j.jssc.2020.121540

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Carrier mobilities, thermoelectric properties, and band structures of type-I clathrates Ba8M16Ge30 (M = Al, Ga, In)2020

    • Author(s)
      Kengo Kishimoto, Koji Akai
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: 8 Pages: 081001-081001

    • DOI

      10.35848/1347-4065/aba32a

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Power generation characteristics of thermoelectric conversion module using type-II (K,Ba)24(Ga,Sn)136 and type-VIII Ba8Ga16(Sn,Ge)30 clathrates2020

    • Author(s)
      Kengo Kishimoto, Koji Akai, Kazuo Nagase, Atsushi Yamamoto
    • Journal Title

      Applied Physics Express

      Volume: 13 Issue: 1 Pages: 011001-011001

    • DOI

      10.7567/1882-0786/ab587c

    • NAID

      210000157597

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Thermoelectric and transport properties of sintered type-II clathrate Cs8Ba16Ga40Sn962019

    • Author(s)
      Kengo Kishimoto, Koji Akai
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 58 Issue: 10 Pages: 101002-101002

    • DOI

      10.7567/1347-4065/ab3de6

    • NAID

      210000156999

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] p 型 Zintl 相 SrSb2 の作製と熱電気的特性2020

    • Author(s)
      藤永速太, 岸本堅剛, 小柳剛, 赤井光治
    • Organizer
      第17回日本熱電学会学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 元素置換したn型Type-I Ge系クラスレートのキャリア移動度2020

    • Author(s)
      井原祐史, 岸本堅剛, 小柳剛, 赤井光治
    • Organizer
      第17回日本熱電学会学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] タイプ1クラスレートBa8M16Ge30(M=Al,Ga,In)のキャリア移動度と熱電気的特性2019

    • Author(s)
      岸本堅剛, 赤井光治
    • Organizer
      第16回日本熱電学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Na-Ba-Ga-Sn系type-IIクラスレート化合物の作製と熱電気的特性2019

    • Author(s)
      川﨑和希, 岸本堅剛, 小柳剛, 赤井光治
    • Organizer
      第16回日本熱電学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] type-Iクラスレート化合物Na8-xBaxGa8+xGe38-xの作製2019

    • Author(s)
      竹下陸, 岸本堅剛, 小柳剛, 赤井光治
    • Organizer
      第16回日本熱電学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Zintl化合物NaGaSn5の作製2019

    • Author(s)
      田所遼, 岸本堅剛, 小柳剛, 赤井光治
    • Organizer
      第16回日本熱電学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] KGa3化合物のナトリウム置換物の作製2019

    • Author(s)
      村岡正一, 岸本堅剛, 小柳剛, 赤井光治
    • Organizer
      第16回日本熱電学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] クラスレート半導体Cs-Ba-Ga-Snの欠損準位に関する電子状態の検討2018

    • Author(s)
      赤井光治, 岸本堅剛
    • Organizer
      第15回日本熱電学会学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Type-Iクラスレート化合物Na8MxGe46-x (M=Ga, Zn)の熱電気的特性2018

    • Author(s)
      竹下陸, 岸本堅剛, 赤井光治, 小柳剛
    • Organizer
      第15回日本熱電学会学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Na-Ba-Ga-Sn系type-IIクラスレート化合物の作製2018

    • Author(s)
      川﨑和希, 岸本堅剛, 赤井光治, 小柳剛
    • Organizer
      第15回日本熱電学会学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] クラスレート半導体Ba8Ga16Sn30のゲストイオンポテンシャルと電磁場相互作用の検討2018

    • Author(s)
      福田遼太, 赤井光治, 岸本堅剛, 小柳剛, 栗巣普揮, 山本節夫
    • Organizer
      第15回日本熱電学会学術講演会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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