Effect of Cu concentration on thermoelectric properties of nanostructured p-type MgAg0.97-xCuxSb0.99

被引：54
|
作者：
Sui, Jiehe [1 ,2 ,3 ,4 ]
Shuai, Jing [1 ,2 ]
Lan, Yucheng [5 ]
Liu, Yuan [1 ,2 ]
He, Ran [1 ,2 ]
Wang, Dezhi [1 ,2 ]
Jie, Qing [1 ,2 ]
Ren, Zhifeng [1 ,2 ]
机构：
[1] Univ Houston, Dept Phys, Houston, TX 77204 USA
[2] Univ Houston, TcSUH, Houston, TX 77204 USA
[3] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
[4] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[5] Morgan State Univ, Dept Phys & Engn Phys, Baltimore, MD 21251 USA
来源：
ACTA MATERIALIA | 2015年 / 87卷
关键词：
MgAgSb alloys; Nanostructure; Thermoelectric; Self-compatibility factor; FIGURE-OF-MERIT; PHONON-GLASS; PERFORMANCE; ENHANCEMENT; SKUTTERUDITES;
D O I：
10.1016/j.actamat.2015.01.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Recently, MgAgSb was discovered to have good thermoelectric properties. In this paper, we intend to substitute a small amount of Ag by Cu to make MgAg0.97-xCuxSb0.99 (x = 0, 0.003, 0.007, and 0.01) thermoelectric materials aiming to decrease the lattice thermal conductivity without sacrificing the power factor. The results showed that Cu substitution not only reduced the thermal conductivity, but also improved the power factor, consequently led to improved ZT values. Among the MgAg0.97-xCuxSb0.99. samples, MgAg0.963Cu0.007Sb0.99 showed the highest ZT values of 0.95 at room temperature and 1.32 at 250 degrees C. In addition, the MgAgSb-based samples displayed much better self-compatibility factors than Bi0.4Sb1.6Te3. The effect of grain orientation on the anisotropy of thermoelectric properties of MgAg0.97Sb0.99 has also been studied. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：266 / 272
页数：7
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