Largely enhanced thermoelectric properties of the binary-phased PbTe-Sb2Te3 nanocomposites

被引：7
作者：
Lu, Pengxian [1 ]
Wang, Xingbang [2 ]
Lu, Manman [2 ]
机构：
[1] Henan Univ Technol, Coll Mat Sci & Engn, Zhengzhou 450007, Peoples R China
[2] Zhengzhou Foreign Language Sch, Zhengzhou 450000, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH | 2012年 / 27卷 / 04期
关键词：
ELECTRICAL-TRANSPORT; HIGH-PRESSURE; HIGH FIGURE; PBTE; COSB3; MERIT; POWER;
D O I：
10.1557/jmr.2011.441
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this article, the binary-phased PbTe-Sb2Te3 nanopowders were synthesized via a hydro/solvo-thermal route to improve the thermoelectric properties of PbTe matrix material. The single-phased PbTe powders exhibit pure nanoparticles, but the binary-phased PbTe-Sb2Te3 powders have a mixed morphology composed of nanospheres and nanoribbons. Our results suggest that the thermal conductivity of the binary-phased PbTe-Sb2Te3 bulks can be reduced significantly and the Seebeck coefficient can be increased obviously, although the electrical conductivity can also be decreased sharply. Consequently, a large figure of merit 0.85 at 623 K can be achieved for 0.7PbTe-0.3Sb(2)Te(3) bulk, which is enhanced by about one time as compared to that of the single-phased PbTe bulk. This large enhancement could be attributed to the lowered carrier concentration and the increased interface scattering in the binary-phased PbTe-Sb2Te3 materials with a mixed morphology.
引用
收藏
页码：734 / 739
页数：6
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