期刊
APPLIED PHYSICS LETTERS
卷 99, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3643051
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资金
- National 973 Program of China [2007CB607502]
- Natural Science Foundation of China [50731006, 51061120455, 50971115]
Large size bismuth telluride based polycrystalline alloys have been prepared to investigate the texture-related anisotropy of thermoelectric properties. X-ray diffraction analysis indicated that the n-type alloy was more easily (001) oriented than the p-type one. Both the electrical and thermal conductivities showed strong anisotropy in the textured samples, while the Seebeck coefficient and the ZT were almost isotropic. However, as the electrical and thermal conductivities were measured along different directions, the ZT could be overestimated up to similar to 60%. A relationship between the texture degree and the anisotropy of the thermal conductivity has been proposed. (C) 2011 American Institute of Physics. [doi:10.1063/1.3643051]
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