2012 Fiscal Year Final Research Report
Localized states and thermoelectric properties of vacancy-containing Sn-based clathrate compounds
| Project/Area Number |
22560698
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Yamaguchi University |
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Principal Investigator |
KISHIMOTO Kengo 山口大学, 大学院・理工学研究科, 助教 (50234216)
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| Co-Investigator(Kenkyū-buntansha) |
AKAI Koji 山口大学, 大学情報機構, 准教授 (20314825)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 熱電材料 / クラスレート / 欠損 / 局在準位 |
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| Research Abstract |
Some thermoelectric clathrate compounds possess vacancies in their frameworks. Such vacancies usually affect their band structures, which dominate their thermoelectric properties. Thus, there is a possibility of improving thermoelectric properties by the control of vacancy-structures of such materials. We have studied the vacancy-structures, thermoelectric properties, and band structures of the clathrate compounds K8Sn44□2(□: vacancy). The clathrate samples exhibited order-disorder phase transitions at 320 K, where their electrical conductivities and power factors almost increased tenfold.
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