Journal
SCRIPTA MATERIALIA
Volume 67, Issue 2, Pages 161-164Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2012.04.005
Keywords
Electrical properties; X-ray diffraction; Nanocrystalline materials; Thermal conductivity
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Funding
- Natural Science Foundation of AnHui province [11040606M51]
- Natural Science Foundation of China [50972146, 10904144, 11174292, 51101150]
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A chemical route combined with a subsequent spark plasma sintering technique was successfully utilized to synthesize n-type Se-substituted ternary Bi2Te3-xSex (0 <= x <= 0.6). We investigated the effect of Se doping on the thermoelectric properties of the Bi2Te3 nanostructured bulk materials. The results indicate that Se doping is an efficient way to reduce the thermal conductivity as compared to that of Bi2Te3 presumably due to enhanced (dopant) scattering of phonons. The maximum thermoelectric figure-of-merit, ZT, is 0.7 at 485 K for Bi2Te2.55Se0.45. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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