Zone Leveling Crystal Growth of Thermoelectric PbTe Alloys with Sb2Te3 Widmanstatten Precipitates

被引：12

作者：

Ikeda, Teruyuki ^{[1
,2
]}

Marolf, Nathan J. ^{[2
]}

Snyder, G. Jeffrey ^{[2
]}

机构：

[1] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

[2] CALTECH, Pasadena, CA 91125 USA

来源：

CRYSTAL GROWTH & DESIGN | 2011年 / 11卷 / 09期

基金：

日本科学技术振兴机构;

关键词：

TELLURIDE;

D O I：

10.1021/cg2007588

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Unidirectional solidification of PbTe-rich alloys in the pseudobinary PbTe-Sb2Te3 system using the zone leveling technique enables the production of large regions of homogeneous solid solutions for the formation of precipitate nanocomposites as compared with Bridgman solidification. (PbTe)(0.940)(Sb2Te3)(0.060) and (PbTe)(0.952)(Sb2Te3)(0.048) alloys were successfully grown using (PbTe)(0.4)(Sb2Te3)(0.6) and (PbTe)(0.461)(Sb2Te3)(0.539) as seed alloys, respectively, with 1 mm h(-1) withdrawal velocity. In the unidirectionally solidified regions of both alloys, Widmanstatten precipitates are formed due to the decrease in solubility of Sb2Te3 in PbTe. To determine the compositions of the seed alloys for the zone leveling experiments, the solute distribution in solidification in the PbTe-richer part of the pseudobinary PbTe-Sb2Te3 system has been examined from the concentration profiles in the samples unidirectionally solidified by the Bridgman method.

引用

页码：4183 / 4189

页数：7

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