Phase transformation and thermoelectric properties of p-type (Bi2Te3)0.25(Sb2Te3)0.75 prepared by mechanical alloying and hot pressing

被引：33
|
作者：
Fan, X. A. [1 ]
Yang, J. Y. [1 ]
Chen, R. G. [1 ]
Zhu, W. [1 ]
Bao, S. Q. [1 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Plast Forming Simulat & Dies Techno, Wuhan 430074, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 438卷
基金：
中国国家自然科学基金;
关键词：
phase transformation; (Bi2Te3)(0.25)(Sb2Te3)(0.75); thermoelectric materials; mechanical alloying; hot pressing;
D O I：
10.1016/j.msea.2005.12.055
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Starting from elemental powder mixtures, p-type (Bi2Te3)(0.25)(Sb2Te3)(0.75) thermoelectric alloys were fabricated via mechanical alloying (MA) and hot pressing in the present work. With the MA process proceeding, elemental Bi, Sb and Te reacted into (Bi2Te3)(0.25)(Sb2Te3)(0.75) solid solution phase, the amount of the solid solution phase increased with prolonging MA time, and single phase (Bi2Te3)(0.25)(Sb2Te3)(0.75) was obtained after MA for 12 h. Microstructure and thermoelectric properties of the hot-pressed samples were investigated. P-type (Bi2Te3)(0.25) (Sb2Te3)(0.75) with slightly preferred orientation and fine grain size were obtained after hot pressing. The maximum figure of merit was obtained as 2.84 x 10(-3) K-1 at room temperature. (c) 2006 Elsevier B.V. All rights reserved.
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页码：190 / 193
页数：4
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