| Project/Area Number |
26820296
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Kyushu University (2016)
Hiroshima University (2014-2015) |
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Principal Investigator |
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| Research Collaborator |
TAKABATAKE Toshiro 広島大学
UMEO Kazunori 広島大学
OHTA Michihiro 産業技術総合研究所
NISHIBORI Eiji 筑波大学
LEE Chul-Ho 産業技術総合研究所
SUZUKI Takashi 広島大学
ISHII Isao 広島大学
TOU Hideki 神戸大学
SATO Hitoshi 広島大学
KUROKI Kazuhiko 大阪大学
USUI Hidetomo 大阪大学
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 熱電変換材料 / 硫化銅鉱物 / テトラヘドライト / コルーサイト / チオスピネル / ラットリング / 金属ー半導体転移 / 熱電変換 / 熱電物性 / 相転移 / テトラへドライト |
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| Outline of Final Research Achievements |
Copper-based minerals, tetrahedrites, have attracted much interest due to their good thermoelectric properties, glass-like thermal conductivity, and metal-semiconductor transition (MST) occurring at 85 K. In this work, transport and thermal properties, and crystal and phonon structures of tetrahedrites have been investigated. It was revealed that the low-energy and anharmonic vibration (rattling) of copper atom is responsible for the glass-like thermal conductivity and the MST. Furthermore, thermoelectric performance of tetrahedrite was improved by the substitutions of germanium and tin for copper.
Attempts to discover high-performance "thermoelectric minerals" have been made. It was found that copper-based minerals, colusites, and mineral-related compounds, thiospinels, respectively exhibit high dimensionless figures of merit at 660K.
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