Journal
ACTA MATERIALIA
Volume 84, Issue -, Pages 385-392Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.10.062
Keywords
Bismuth tellurides; Thermoelectric materials; Zone-melting; Hot deformation; Donor-like effect
Funding
- National Basic Research Program of China [2013CB632503]
- Nature Science Foundation of China [51171171, 51271165]
- Ph.D program Foundation of Ministry of Education of China [20120101110082, 20110101110024]
- Program for New Century Excellent Talents in University of China [NCET-12-0495]
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Zone-melted bismuth antimony telluride alloys have been the most widely applied commercial thermoelectric (TE) materials for decades. In this work it is demonstrated that hot deformation can enhance both TB properties and mechanical properties of zone-melted (Bi,Sb)(2)Te-3 alloys. The hot deformation modifies the microstructure and induces a donor-like effect to adjust the carrier concentration and significantly reduce the lattice thermal conductivity. A high dimensionless figure of merit (ZT) of 1.36 at 400 K is obtained in Bi0.4Sb1.6Te3 after hot deformation, and also the average ZT is similar to 1.2 in the temperature range of 300-525 K, which makes the alloy suitable for low temperature power generation. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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