Enhanced thermoelectric and mechanical properties of zone melted p-type (Bi,Sb)2Te3 thermoelectric materials by hot deformation
Enhanced thermoelectric and mechanical properties of zone melted p-type (Bi,Sb)2Te3 thermoelectric materials by hot deformation
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DOI：
10.1016/j.actamat.2014.10.062
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发表时间：
2015-02-01
期刊：
影响因子：
9.4
通讯作者：
Zhu, T. J.
中科院分区：
文献类型：
--
作者：
Xu, Z. J.;Hu, L. P.;Zhu, T. J.
几十年来，区熔碲化铋锑合金一直是应用最广泛的商业热电（TE）材料。研究表明，热变形可以提高区熔（Bi，Sb）（2）Te-3合金的热膨胀性能和力学性能。热变形改变了微结构，诱导了类施主效应，从而调节了载流子浓度，显著降低了晶格热导率。Bi_（0.4）Sb_（1.6）Te_3合金经热变形后，在400 K时的无量纲优值（ZT）高达1.36，在300-525 K温度范围内的平均ZT接近1.2，适合于低温发电。(C)2014 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
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.