期刊
ACTA MATERIALIA
卷 75, 期 -, 页码 316-321出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.05.019
关键词
Thermoelectrics; Nanostructuring; Dimensionless figure-of-merit
资金
- DOE [DE-EE0005806]
We present a study on the dimensionless thermoelectric figure-of-merit (ZT) of nanostructured YbxCo4Sb12 (x = 0.2, 0.35, 0.45. 0.5 and 0.6) made by hot pressing the nanopowder obtained from ball milling an ingot in comparison with that made directly from ball milling the elements. It was found that the electrical conductivity of the sample made from the ingot is higher and the thermal conductivity is lower compared to the sample made from directly ball milling the elements. It is believed that the higher electrical conductivity is due to the presence of fewer defects, while the lower thermal conductivity may be due to stronger phonon scattering from the different grain sizes. We have achieved a peak ZT of similar to 1.4 at 550 degrees C in Yb0.35Co4Sb12. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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