2022 Fiscal Year Final Research Report
Relationships between localized-mode phonon energy and thermal transport properties
| Project/Area Number |
20H02459
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 26040:Structural materials and functional materials-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 熱伝導 / 格子振動 / フォノン分散 / 非調和振動 |
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| Outline of Final Research Achievements |
To control the transport of highly diffusive heat on a micro scale, it is essential to have a thermal switching mechanism that can reversibly switch the heat flow on and off in a simple way without mechanical driving parts. In this study, the effect of thermal vibration of guest atoms in inclusion compounds on the lattice thermal conductivity was investigated to obtain a design guideline for thermal switching materials in which the thermal conductivity can be drastically changed by manipulating guest atoms in an external field. The results showed that anharmonicity, rather than the localization of thermal vibration, strongly governs the lattice thermal conductivity.
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| Free Research Field |
金属材料，金属物性
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| Academic Significance and Societal Importance of the Research Achievements |
物質の熱伝導率の起源については現代において不明な点が多い．本研究では，包接化合物と呼ばれるホストゲスト型の構造を有する場合，ゲスト原子の熱振動，特にその非調和性が格子熱伝導率低減に大きく寄与していることを明らかにした．本研究で得られた知見は低い熱伝導率が求められる熱電変換材料の研究開発にも応用できると考えられ，工業的重要度も高い．
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