Thermoelectric properties of 25%Bi2Te3-75%Sb2Te3 solid solution prepared by hot-pressing method

被引：39

作者：

Shin, HS ^{[1
]}

Ha, HP ^{[1
]}

Hyun, DB ^{[1
]}

Shim, JD ^{[1
]}

Lee, DH ^{[1
]}

机构：

[1] YONSEI UNIV,SEOUL 120749,SOUTH KOREA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1997年 / 58卷 / 04期

关键词：

semiconductors; chalcogenides; defects; electrical properties; mechanical properties;

D O I：

10.1016/S0022-3697(96)00049-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The Seebeck coefficient and electrical conductivity of the 25% Bi2Te3 - 75 % Sb2Te3 solid solution prepared by hot-pressing method were measured and the effects of particle size, oxidation, hot-pressing temperature and time on the Seebeck coefficient of the polycrystalline solid solution were examined in detail. It has been found that the mechanical deformation during pulverization or pressing processes is very important in controlling the Seebeck cofficient. The role of the anion vacancies formed by the mechanical deformation as well as the change of the antistructure defect concentration were discussed. By optimizing particle size and hot-pressing temperature, the figure of merit about 2.9 x 10(-3) K-1 could be obtained for the p-type polycrystalline 25% Bi2Te3 - 75% Sb2Te3 solid solutions without excess Te addition. (C) 1997 Elsevier Science Ltd.

引用

页码：671 / 678

页数：8

共 14 条

[1]

GEORGE WR, 1959, P PHYS SOC LOND, V74, P769

[2]

Goldsmid H. J, 1964, THERMOELECTRIC REFRI, P133

[3] THE EFFECT OF EXCESS TELLURIUM ON THE THERMOELECTRIC PROPERTIES OF BI2TE3-SB2TE3 SOLID-SOLUTIONS [J].