Effects of process parameters on electrical properties of n-type Bi2Te3 prepared by mechanical alloying and spark plasma sintering

被引：39
作者：
Zhao, L. D.
Zhang, B. -P.
Li, J. -F.
Zhou, M.
Liu, W. S.
机构：
[1] Beijing Univ Sci & Technol, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
来源：
PHYSICA B-CONDENSED MATTER | 2007年 / 400卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
Bi2Te3; spark plasma sintering; seebeck coefficient; electrical conductivity;
D O I：
10.1016/j.physb.2007.06.009
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
n-Type Bi2Te3 thermoelectric materials were prepared by spark plasma sintering (SPS) using mechanically alloyed powders. Seebeck coefficient and electrical conductivity of the resultant materials were measured, with emphasis on the effects of sintering process parameters on the electrical properties. The power factor was improved from 1.5 to 1.6mW/mK(2) when the SPS pressure was increased from 20 to 50 MPa at 623 K, and was further increased to 2.1 mW/mK(2) under 50 MPa by raising the SPS temperature from 623 to 673 K. The maximum power factor was obtained for the sample sintered under optimized SPS process parameters, in which the sintering temperature and the sintering pressure are 673 K and 50 MPa, respectively. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：11 / 15
页数：5
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