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Development of high-performance nanocomposite thermoelectric bulk using self-organizing eutectic structure

Research Project

Project/Area Number 19H02795
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
Research InstitutionTohoku University

Principal Investigator

Yokota Yuui  東北大学, 金属材料研究所, 准教授 (60517671)

Co-Investigator(Kenkyū-buntansha) 荻野 拓  国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 主任研究員 (70359545)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2021: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2020: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
Keywords熱電材料 / 共晶体 / 一方向凝固 / ナノ
Outline of Research at the Start

本研究では、共晶点組成の融液を一方向凝固することで自己組織化される相分離構造を、熱電材料バルク体においてナノレベルで実現し、飛躍的な熱電特性の向上を目指す。本技術が実現すれば、従来の熱電材料の開発で別々に実施されてきた「均一なナノ構造体」と「ナノ構造体のバルク化」を同時に達成できる熱電材料の革新的製造技術となる。

Outline of Final Research Achievements

In this study, we realized thermoelectric bulk crystals with uniform nanostructures by utilizing the self-assembly of the eutectic structure. Specifically, we have established a technology to produce SrTiO3/TiO2 eutectic bulk crystals with dopants of Nb, La, and Pr as a thermoelectric oxide material, and Sn/SnSe and SnSe2/SnSe eutectic bulk crystals as a thermoelectric alloy material. Self-assembly of the eutectic structure composed of the uniform rod phase in the matrix phase of the thermoelectric material could be achieved. In the thermoelectric characterization, the thermal conductivity was reduced because of the phonon scattering, and the figure of merit ZT was improved.

Academic Significance and Societal Importance of the Research Achievements

共晶点組成の溶融凝固による相分離を利用した研究は一部報告されているが、それらは全て一方向凝固を用いておらず、バルク体全体で均一な相分離構造を形成することができていない。さらに、育成速度の制御も行っていないため、相分離構造のナノレベル化の報告例もない。一方、本研究ではナノレベルの相分離構造を一工程で実現しており、熱伝導度の低減にも成功している。本技術はナノ粒子を用いることなく、バルク化したナノ構造材を実現できる点で将来を見据えた理想的な熱電バルク体の製造法となることが期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (9 results)

All 2022 2021 2019

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

  • [Journal Article] Microstructure and thermoelectric properties of La-doped SrTiO3/TiO2 eutectic crystals grown by Micro-Pulling-Down method2022

    • Author(s)
      Yokota Yuui、Horii Shigeru、Ogino Hiraku、Yoshida Yoshiyuki、Yoshikawa Akira
    • Journal Title

      Journal of Crystal Growth

      Volume: 583 Pages: 126551-126551

    • DOI

      10.1016/j.jcrysgro.2022.126551

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crystal growth of La2Hf2O7 by micro-pulling-down method using W crucible2022

    • Author(s)
      Suda Takahiro、Yokota Yuui、Horiai Takahiko、Yamaji Akihiro、Yoshino Masao、Hanada Takashi、Sato Hiroki、Toyoda Satoshi、Ohashi Yuji、Kurosawa Shunsuke、Kamada Kei、Yoshikawa Akira
    • Journal Title

      Journal of Crystal Growth

      Volume: 583 Pages: 126547-126547

    • DOI

      10.1016/j.jcrysgro.2022.126547

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Growth, Microstructure, and Mechanical Properties of Co?Cr?Mo Crystal Fibers Fabricated from the Melt by Unidirectional Solidification2021

    • Author(s)
      Yokota Yuui、Nihei Takayuki、Abe Shoki、Yoshikawa Akira
    • Journal Title

      Advanced Engineering Materials

      Volume: 23 Issue: 10 Pages: 2100144-2100144

    • DOI

      10.1002/adem.202100144

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crystal growth of La2Zr2O7 by micro-pulling-down method using Mo and W crucibles2021

    • Author(s)
      Suda Takahiro、Yokota Yuui、Horiai Takahiko、Yamaji Akihiro、Yoshino Masao、Hanada Takashi、Sato Hiroki、Toyoda Satoshi、Ohashi Yuji、Kurosawa Shunsuke、Kamada Kei、Yoshikawa Akira
    • Journal Title

      Journal of Crystal Growth

      Volume: 575 Pages: 126357-126357

    • DOI

      10.1016/j.jcrysgro.2021.126357

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] Microstructure and Thermoelectric Properties of La-doped SrTiO3/TiO2 Eutectic Crystals Grown by Micro-Pulling-Down Method2021

    • Author(s)
      Yuui Yokota, Shigeru Horii, Hiraku Ogino, Yoshiyuki Yoshida, Akira Yoshikawa
    • Organizer
      The 22nd American Conference on Crystal Growth and Epitaxy (ACCGE-22) and The 20th US Workshop on Organometallic Vapor Phase Epitaxy (OMVPE-20)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] SrTiO3熱電材料における共晶体組織利用2021

    • Author(s)
      横田有為, 堀井滋, 荻野拓, 吉田良行, 吉川彰
    • Organizer
      第50回結晶成長国内会議(JCCG-50)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Crystal growth, microstructure and Thermoelectric properties of SrTiO3/TiO2 eutectic crystals2021

    • Author(s)
      Yuui Yokota, Shigeru Horii, Hiraku Ogino, Akira Yoshikawa
    • Organizer
      The 8th Asian Conference on Crystal Growth and Crystal Technology (CGCT-8)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Control of microstructure for La-doped SrTiO3/TiO2 eutectic thermoelectric material by growth rate2019

    • Author(s)
      Yuui Yokota, Shigeru Horii, Hiraku Ogino, Masao Yoshino, Akihiro Yamaji, Hiroki Sato, Yuji Ohashi, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa
    • Organizer
      The 38th International Conference on Thermoelectrics and The 4th Asian Conference on Thermoelectrics (ICT/ACT2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Book] 液相からの結晶成長入門-育成技術と評価方法-2021

    • Author(s)
      日本フラックス成長研究会、吉川 彰、横田 有為、我田 元
    • Total Pages
      216
    • Publisher
      日刊工業新聞社
    • ISBN
      9784526081774
    • Related Report
      2021 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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