Quaternary thermoelectric materials: Synthesis, microstructure and thermoelectric properties of the (Bi, Sb)2(Te, Se)3 alloys

被引：14

作者：

Guo, Xin ^{[1
]}

Qin, Jieming ^{[1
]}

Jia, Xiaopeng ^{[2
]}

Ma, Hongan ^{[2
]}

Jia, Hongsheng ^{[3
]}

机构：

[1] Changchun Univ Sci & Technol, Mat Sci & Engn, Changchun 130022, Peoples R China

[2] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China

[3] Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 705卷

基金：

美国国家科学基金会;

关键词：

Thermoelectric materials; High-pressure; (Bi; Sb)(2)(Te; Se)(3); Microstructure; Raman spectra; PERFORMANCE;

D O I：

10.1016/j.jallcom.2017.02.182

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：

High-quality quaternary Bi0.5Sb1.5Te3-xSex (BSTS) alloys with x - 0.3, 0.5 and 0.75 are successfully synthesized in 25 min by high pressure and high temperature (HPHT) method. Due to the effects of synthesis pressure and Se doping, the texture and microstructure exhibit abundant distorted layers and lattice defects. The unique triangular nanoplates can be obtained in the microstructures by HPHT method without any substrates, suggesting that Bi0.5Sb1.5Te3-xSex has a nature of the epitaxial growth. The thermoelectric transport properties are characterized in detail, revealing an evident correlation with the amount of Se doping. As a result, a maximum ZT value of 0.95 is achieved at 503 K from the as-prepared Bi0.5Sb1.5Te2.7Se0.3 alloys. Additionally, Raman spectra are conducted and then indicate that Se doping contents have an important influence on the lattice vibrations and lattice structures of quaternary (Bi, Sb)(2)(Te, Se)(3) alloys. (C) 2017 Elsevier B.V.All rights reserved.

引用

页码：363 / 368

页数：6