2022 Fiscal Year Final Research Report
Achieving minimum thermal conductivity in higher manganese silicide-based thermoelectric materials through controlling of incommensurate nano-sized domains
| Project/Area Number |
20H00394
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
林 慶 東北大学, 工学研究科, 准教授 (70360625)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 熱電変換 / 格子熱伝導率 / 非整合構造 |
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| 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.
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| Free Research Field |
無機固体化学
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| 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。
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