Microstructure and electrical properties of quenched AgPb 18Sb1-xTe20 thermoelectric materials

被引：15

作者：

State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China ^{[1
]}

机构：

[1] State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University

来源：

J Phys D | 2007年 / 11卷 / 3537-3540期

关键词：

High resolution electron microscopy - Liquid nitrogen - Quenching - Seebeck coefficient - Thermoelectricity;

D O I：

10.1088/0022-3727/40/11/042

中图分类号：

学科分类号：

摘要：

Bulk AgPbmSbTe2+m compounds exhibit outstanding thermoelectric properties. It is believed that their preparation by a higher cooling rate could improve the homogeneity of these materials, and thereby one expects a certain impact on their thermoelectric properties. We have prepared AgPb18Sb1-xTe20 compounds where x ≤ 0.0, 0.1, 0.3 and 0.5 by quenching the melts in liquid nitrogen. High-resolution transmission electron microscopy has confirmed that the homogeneity of the samples is improved with respect to the samples prepared by furnace cooling. The decrease in the electric conductivity and the increase in the absolute value of the Seebeck coefficient, we ascribe to the improved homogeneity of the samples. The same effects on the conductivity and on the Seebeck coefficient are obtained with increasing Sb content. The influence of the Sb concentration are interpreted as follows: the number of Ag-Sb pairs and thereby the widening of the energy band increase with increasing Sb content. © 2007 IOP Publishing Ltd.

引用

页码：3537 / 3540

页数：3

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