A Dual Role by Incorporation of Magnesium in YbZn2Sb2Zintl Phase for Enhanced Thermoelectric Performance

被引：69

作者：

Zhang, Zongwei ^{[1
,2
]}

Yan, Yirui ^{[1
,2
]}

Li, Xiaofang ^{[1
,2
]}

Wang, Xinyu ^{[1
,2
]}

Li, Juan ^{[1
,2
]}

Chen, Chen ^{[1
,2
]}

Cao, Feng ^{[3
]}

Sui, Jiehe ^{[4
]}

Lin, Xi ^{[1
,2
]}

Liu, Xingjun ^{[1
,2
,4
]}

Xie, Guoqiang ^{[1
,2
]}

Zhang, Qian ^{[1
,2
,4
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Shenzhen 518055, Peoples R China

[2] Harbin Inst Technol, Inst Mat Genome & Big Data, Shenzhen 518055, Peoples R China

[3] Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China

[4] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China

来源：

ADVANCED ENERGY MATERIALS | 2020年 / 10卷 / 29期

基金：

中国国家自然科学基金;

关键词：

(Yb0; 9Mg0; 1)MgxZn2-xSb2; Ag doping; orbital alignment; thermoelectric; Zintl phase; ZINTL PHASES; CA1-XEUXZN2SB2; SUBSTITUTION; TRANSPORT;

D O I：

10.1002/aenm.202001229

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：

1-2-2-type Zintl phase compounds have promising thermoelectric properties because of their complex crystal structures and multiple valence-band structures. In this work, a series of single phase (Yb0.9Mg0.1)MgxZn2-xSb2(x= 0, 0.2, 0.4, 0.6, 0.8, and 1) compounds are prepared by alloying YbZn(2)Sb(2)with 10 at% MgZn(2)Sb(2)and different amounts of YbMg2Sb2. The incorporation of Mg at the Yb site, as well as at the Zn site, not only leads to an effective orbital alignment confirmed by the dramatically enhanced density of states effective mass and Seebeck coefficients, but also increases the point defect scattering, contributing to a low lattice thermal conductivity approximate to 0.54 W m(-1)K(-1)at 773 K. Combined with the optimization of the carrier concentration by Ag doping at the Zn site, a highestZTvalue approximate to 1.5 at 773 K is achieved in (Yb0.9Mg0.1)Mg0.8Zn1.2Ag0.002Sb2, which is higher than that of all the previously reported 1-2-2-type Zintl phase compounds.

引用

页数：7

共 38 条

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