Enhancement of Thermoelectric Figure of Merit by the Insertion of MgTe Nanostructures in p-type PbTe Doped with Na2Te

被引：118

作者：

Ohta, Michihiro ^{[1
,2
,4
]}

Biswas, Kanishka ^{[1
]}

Lo, Shih-Han ^{[3
]}

He, Jiaqing ^{[1
,3
]}

Chung, Duck Young ^{[2
]}

Dravid, Vinayak P. ^{[3
]}

Kanatzidis, Mercouri G. ^{[1
,2
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[3] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

[4] Natl Inst Adv Ind Sci & Technol, Energy Technol Res Inst, Tsukuba, Ibaraki 3058568, Japan

来源：

ADVANCED ENERGY MATERIALS | 2012年 / 2卷 / 09期

关键词：

lead telluride; nanoprecipitates; electrical transport properties; thermal conductivity; thermoelectrics; DENSITY-OF-STATES; LEAD-TELLURIDE; SPINODAL DECOMPOSITION; THERMAL-CONDUCTIVITY; BULK MATERIALS; ALLOY SYSTEM; PERFORMANCE; EFFICIENCY; PBS; BAND;

D O I：

10.1002/aenm.201100756

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The thermoelectric properties of crystalline melt-grown ingots of p-type PbTexMgTe (x = 13 mol%) doped with Na2Te (12 mol%) were investigated over the temperature range of 300 K to 810 K. While the powder X-ray diffraction patterns show that all samples crystallize in the NaCl-type structure with no MgTe or other phases present, transmission electron microscopy reveals ubiquitous MgTe nanoprecipitates in the PbTe. The very small amounts of MgTe in PbTe have only a small effect on the electrical transport properties of the system, while they have a large effect on thermal transport significantly reducing the lattice thermal conductivity. A ZT of 1.6 at 780 K is achieved for the PbTe containing 2% MgTe doped with 2% Na2Te.

引用

页码：1117 / 1123

页数：7

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