Enhanced thermoelectric and mechanical properties of zone melted p-type (Bi,Sb)2Te3 thermoelectric materials by hot deformation

被引：121
作者：
Xu, Z. J. [1 ]
Hu, L. P. [1 ]
Ying, P. J. [1 ]
Zhao, X. B. [1 ,2 ]
Zhu, T. J. [1 ,2 ,3 ]
机构：
[1] Zhejiang Univ, Dept Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China
[2] Zhejiang Univ, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Zhejiang, Peoples R China
[3] Zhejiang Univ, Cyrus Tang Ctr Sensor Mat & Applicat, Hangzhou 310027, Zhejiang, Peoples R China
来源：
ACTA MATERIALIA | 2015年 / 84卷
关键词：
Bismuth tellurides; Thermoelectric materials; Zone-melting; Hot deformation; Donor-like effect; TELLURIDE-BASED ALLOYS; BISMUTH-TELLURIDE; ANTISITE DEFECTS; PERFORMANCE;
D O I：
10.1016/j.actamat.2014.10.062
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：385 / 392
页数：8
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