Zintl-phase Eu2ZnSb2: A promising thermoelectric material with ultralow thermal conductivity

被引：119
|
作者：
Chen, Chen [1 ,2 ]
Xue, Wenhua [3 ]
Li, Shan [1 ,2 ]
Zhang, Zongwei [1 ,2 ]
Li, Xiaofang [1 ,2 ]
Wang, Xinyu [1 ,2 ]
Liu, Yijie [4 ]
Sui, Jiehe [5 ]
Liu, Xingjun [1 ,2 ,5 ]
Cao, Feng [4 ]
Ren, Zhifeng [6 ,7 ]
Chu, Ching-Wu [6 ,7 ]
Wang, Yumei [3 ]
Zhang, Qian [1 ,2 ]
机构：
[1] Harbin Inst Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
[2] Harbin Inst Technol, Inst Mat Genome & Big Data, Shenzhen 518055, Peoples R China
[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[4] Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China
[5] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China
[6] Univ Houston, Dept Phys, Houston, TX 77204 USA
[7] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA
来源：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2019年 / 116卷 / 08期
基金：
中国国家自然科学基金;
关键词：
thermoelectric properties; Zintl phase; low thermal conductivity; Eu2ZnSb2; PERFORMANCE; ENHANCEMENT; EFFICIENCY; SR; ZT;
D O I：
10.1073/pnas.1819157116
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Zintl compounds are considered to be potential thermoelectric materials due to their "phonon glass electron crystal" (PGEC) structure. A promising Zintl-phase thermoelectric material, 2-1-2-type Eu2ZnSb2 (P6(3)/mmc), was prepared and investigated. The extremely low lattice thermal conductivity is attributed to the external Eu atomic layers inserted in the [Zn2Sb2](2-) network in the structure of 1-2-2-type EuZn2Sb2 (P (3) over bar m1), as well as the abundant inversion domain boundary. By regulating the Zn deficiency, the electrical properties are significantly enhanced, and the maximum ZT value reaches similar to 1.0 at 823 K for Eu2Zn0.98Sb2. Our discovery provides a class of Zintl thermoelectric materials applicable in the medium-temperature range.
引用
收藏
页码：2831 / 2836
页数：6
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