期刊
APPLIED PHYSICS LETTERS
卷 105, 期 13, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4896998
关键词
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资金
- JSPS KAKENHI [26820296]
- Thermal and Electric Energy Technology Foundation
- Electric Technology Research Foundation of Chugoku, Japan
- Japan-U.S. Cooperation Project for Research and Standardization of Clean Energy Technologies - METI
- Grants-in-Aid for Scientific Research [26820296] Funding Source: KAKEN
We report thermoelectric (TE) properties of dense samples of colusites Cu26V2M6S32 (M = Ge, Sn), most of which are composed of earth-abundant elements; Cu and S. The combination of p-type metallic conduction and large thermopowers greater than 200 mu V/K leads to high TE power factors of 0.61 and 0.48 mW/K-2 m at 663 K for M = Ge and Sn samples, respectively. Furthermore, the lattice thermal conductivity is smaller than 0.6 W/Km over the temperature range from 350 K to 663 K due to the structural complexity. As a consequence, the values of dimensionless TE figure of merit ZT for M = Ge and Sn reach 0.73 and 0.56 at 663 K, respectively. Thus, the colusites are promising candidates for environmental friendly TE materials usable in the range of 500-700 K. (C) 2014 AIP Publishing LLC.
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