期刊
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
卷 4, 期 11, 页码 317-319出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201004278
关键词
silver germanium tellurides; thermoelectrics; thermal conductivity
资金
- Natural Science Foundation of China [50731006, 50971115]
- National 973 Program of China [2007CB607502]
- S&T Program of Zhejiang Province [2009C34007]
Nonstoichiometric Ag8-xGeTe6 (x = 0, 0.01, 0.02, 0.04) compounds with complex crystal structure are demonstrated to exhibit very low thermal conductivities of <0.28 W/m K, comparable with the calculated theoretical minimum thermal conductivity kappa(min). Ag deficiency leads to the improved electrical properties and a maximum thermoelectric figure of merit ZT of 0.85 has been obtained at 623 K for Ag7.99GeTe6, about 30% increase compared to that of stoichiometric Ag8GeTe6. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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