2020 Fiscal Year Final Research Report
Improvement of thermoelectric properties on the bases of dispersion of phonon scattering by lattice defects
| Project/Area Number |
18H01737
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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 | Kobe University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
寺本 武司 神戸大学, 工学研究科, 助教 (10781833)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | 熱電材料 / 部分還元ルチル / フォノン散乱源 |
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| Outline of Final Research Achievements |
The lattice heat transfer rate decreased in the material to which Cr, which has stable trivalent ions, and Zr, which has stable tetravalent ions, decreased, but the electrical resistance increased at a larger rate. It became clear that the additions do not contribute to the improvement of thermoelectric performance.
An attempt was made to precipitate a composite oxide in the crystal. The scattering ability of low-frequency phonons of the coarse composite oxide precipitated at the grain boundaries was not very large. We could not find any heat treatment conditions that could realize the dispersion of fine precipitates in the grains.
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| Free Research Field |
材料物性
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| Academic Significance and Societal Importance of the Research Achievements |
熱電材料は排熱などの低品位の熱源から電気エネルギーを回収することができ，エネルギーの利用効率向上に大きく寄与することが期待されている．しかしながら，現在使用されている熱電材料は毒性を持っていたり希少であるような元素が用いられ，広く用いる上での障害となっている．部分還元ルチルは自然界にありふれた元素から成り立っており，添加元素によってこの材料の熱電性能を向上させることは安全な熱電材料を得るために重要である．
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