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Achieving minimum thermal conductivity in higher manganese silicide-based thermoelectric materials through controlling of incommensurate nano-sized domains

Research Project

Project/Area Number 20H00394
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
Research InstitutionTohoku University

Principal Investigator

Miyazaki Yuzuru  東北大学, 工学研究科, 教授 (40261606)

Co-Investigator(Kenkyū-buntansha) 林 慶  東北大学, 工学研究科, 准教授 (70360625)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥46,150,000 (Direct Cost: ¥35,500,000、Indirect Cost: ¥10,650,000)
Fiscal Year 2022: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2021: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
Fiscal Year 2020: ¥26,000,000 (Direct Cost: ¥20,000,000、Indirect Cost: ¥6,000,000)
Keywords熱電変換 / 格子熱伝導率 / 非整合構造 / ナノ構造 / 非整合複合結晶 / チムニーラダー型化合物
Outline of Research at the Start

対象とするMnSiγ(γ ~1.7)においては、非整合ナノドメイン分裂と呼ばれる、Si原子の配列が規則的な領域(規則ドメイン)と、歪みが大量に入った縞状領域(不規則ドメイン)のナノレベルでの微細組織分裂が形成される。本研究では、非整合ナノドメイン分裂が生じる起源を解明するとともに、元素置換による分裂形態(サイズ、形状、分布状態)と熱伝導率との関連を詳細に調べて、格子熱伝導率を大幅に低減可能なナノ組織の実現を図り、実用レベルにある熱電発電材料および発電モジュールを創製する。

Outline of Final Research Achievements

Higher Manganese Silicide (HMS)-based thermoelectric (TE) materials can be applied to utilise waste heat from automobile engines. The present research aimed to study the relationship between nanostructure, derived from the incommensurability of HMSs, and lattice thermal conductivity, to develop potential TE materials to be operated at 800 K. We have revealed that partially-substituted samples exhibit the highest dimension-less figure-of-merit of zT = 0.75. Based on the knowledge, we have also started to optimise n-type TE performance in related materials.

Academic Significance and Societal Importance of the Research Achievements

結晶の非整合性に基づく多彩なナノ組織と、それがフォノン伝播ひいては格子熱伝導率に及ぼす影響を系統的に明らかにし、それらの知見を基に実用レベルの熱電発電材料を創製した学術的価値の高い研究である。社会的には、本材料の利用により、自動車エンジンからの排熱有効利用により燃費の向上およびCO2排出量の削減に資する効果が期待される成果である。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Comments on the Screening Results   Annual Research Report
  • Research Products

    (10 results)

All 2023 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (6 results) (of which Int'l Joint Research: 6 results,  Invited: 4 results) Book (1 results)

  • [Journal Article] Anisotropic correlations in higher manganese silicides2023

    • Author(s)
      Chauhan Nagendra S.、Ono Ichiro、Hayashi Kei、Miyazaki Yuzuru
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 935 Pages: 167983-167983

    • DOI

      10.1016/j.jallcom.2022.167983

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Charge-Compensated (V, Ru) Co-Substitution in Higher Manganese Silicide Single Crystals for Enhanced Thermoelectric and Mechanical Performance2023

    • Author(s)
      Chauhan Nagendra Singh、Ono Ichiro、Hayashi Kei、Miyazaki Yuzuru
    • Journal Title

      ACS Applied Energy Materials

      Volume: 6 Issue: 7 Pages: 3714-3723

    • DOI

      10.1021/acsaem.2c03803

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Relevance of Solidification Kinetics for Enhanced Thermoelectric Performance in Al-Doped Higher Manganese Silicides2022

    • Author(s)
      Chauhan Nagendra S.、Ono Ichiro、Hayashi Kei、Miyazaki Yuzuru
    • Journal Title

      ACS Applied Materials and Interfaces

      Volume: 14 Issue: 46 Pages: 51983-51993

    • DOI

      10.1021/acsami.2c16107

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Incommensurate Nowotny Chimney-Ladder phases - Potential thermoelectric materials2023

    • Author(s)
      Y. Miyazaki, N. S. Chauhan, T. Kurosawa, and K. Hayashi
    • Organizer
      The International Workshop Thermoelectric Materials: from materials chemistry and physics to devices (IWT2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Higher Manganese Silicides: Incommensurability and Thermoelectric Properties2022

    • Author(s)
      Yuzuru Miyazaki
    • Organizer
      SIPS2022 Mizutani International Symposium
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Realising enhanced thermoelectric performance in partially substituted higher manganese silicides crystals2022

    • Author(s)
      N. S. Chauhan, I. Ono, K. Hayashi, and Y. Miyazaki
    • Organizer
      18th European Conference on Thermoelectrics (ECT'22)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Partially compensated (Ru, V) co-doped higher manganese silicide single crystals2022

    • Author(s)
      N. S. Chauhan, I. Ono, K. Hayashi, and Y. Miyazaki
    • Organizer
      The 6th Asia-Pacific Conference on Semiconducting Silicides and Related Materials, 2022 (APAC-Silicide 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Crystal Structure and Thermoelectric Properties of Incommensurate Composite Crystal MnSiγ (γ~1.7)2021

    • Author(s)
      Y. Miyazaki, H. Nagai, H. Hamada, Y. Kikuchi, K. Hayashi
    • Organizer
      Materials Research Meeting, MRM2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Understanding Detailed Crystal Structures for Improving Thermoelectric Properties of Silicide-based Materials2020

    • Author(s)
      Y. Miyazaki, H. Nagai, H. Nakasawa, W. Saito, M. Kubouchi, t. Takamatsu and K. Hayashi
    • Organizer
      5th Asian Conference on Thermoelectrics
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] Thermoelectric Energy Conversion, Theory and Mechanisms, Materials, Devices, and Applications2021

    • Author(s)
      Yuzuru Miyazaki
    • Total Pages
      13
    • Publisher
      Elsevier
    • ISBN
      9780128185353
    • Related Report
      2020 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

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