Effect of annealing on thermoelectric properties of eutectic PbTe-Sb2Te3 composite with self-assembled lamellar structure

被引：12
作者：
Liu, Jing [1 ]
Wang, Xiaoguang [1 ]
Peng, Liangming [1 ]
机构：
[1] Univ Sci & Technol China, Sch Engn Sci, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230026, Peoples R China
来源：
INTERMETALLICS | 2013年 / 41卷
关键词：
Ternary alloy systems; Thermoelectric properties; Melting; Phase interfaces; LATTICE THERMAL-CONDUCTIVITY; PBTE; ALLOYS; MERIT; ENHANCEMENT; PERFORMANCE; FIGURE; NANOSTRUCTURES; EFFICIENCY; MODEL;
D O I：
10.1016/j.intermet.2013.04.018
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The eutectic PbTe-Sb2Te3 composite with self-organized lamellar structure was synthesized using induction melting and the effects of annealing on the microstructure and thermoelectric properties were investigated. The PbTe and Sb2Te3 lamellae are crystallographically oriented with coherent interface, which are found to insignificantly affect the electronic flow. After annealed, the spheroidization of the lamellae occurs, and the carrier concentration decreases. Despite the increased phase boundaries, the lattice thermal conductivity increases with the annealing time. Largely due to the enhanced Seebeck coefficient, a maximum Zr similar to 0.48 at 550 K for the sample annealed for 20 h at 573 K is achieved, showing a 60% improvement over that of the as-melted one. (C) 2013 Elsevier Ltd. All rights reserved.
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页码：63 / 69
页数：7
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