2013 Fiscal Year Final Research Report
Research of High Performance Thermoelectric Materials with Nano-size Cages by focusing Random Host Structure of Quaternary Sn-based Clathrate Semiconductors
| Project/Area Number |
23560838
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 |
AKAI KOJI 山口大学, 大学情報機構, 准教授 (20314825)
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| Co-Investigator(Kenkyū-buntansha) |
KISHIMOTO Kengo 山口大学, 理工学研究科, 助教 (50234216)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 熱･エネルギー材料 / 熱電クラスレート半導体 |
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| Research Abstract |
We studied improve of a thermoelectric performance for Ba-Ga-Sn clathrate semiconductors with nano-size caged structure. The Sn-based clathrates have high abilities as high performance thermoelectric materials, in spits of a random structure of Ga and Sn in the host lattice. Therefore it is expected that transport properties are robust for additional element doping in Ba-Ga-Sn. In this study we tried to enhance the mobility of carrier by atomic doping to host sites or guest sites. In theoretical approaches we calculated the electronic structure by an ab-initio method and calculated the thermoelectric properties by using calculated band structure. In the calculation of the thermoelectric properties the semi-classical theory was used by the Boltzmann equation. In the experimental researches, new materials were synthesized, and a thermoelectric power, an electrical conductivity, and a thermal conductivity were measured.
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