Enhanced Thermoelectric Properties of p-Type CaMg2Bi2 via a Synergistic Effect Originated from Zn and Alkali-Metal Co-doping

被引：29

作者：

Guo, Muchun ^{[1
]}

Guo, Fengkai ^{[1
]}

Zhu, Jianbo ^{[1
]}

Yin, Li ^{[2
]}

Qin, Haixu ^{[1
]}

Zhang, Qian ^{[2
]}

Cai, Wei ^{[1
]}

Sui, Jiehe ^{[1
]}

机构：

[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China

[2] Harbin Inst Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 05期

基金：

中国国家自然科学基金;

关键词：

CaMg2Bi2; alkali-metal doping point defect; carrier concentration optimization; thermoelectric properties;

D O I：

10.1021/acsami.9b22333

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Bi-based Zintl phase CaMg2Bi2 is a promising thermoelectric material. Here, we report that the high-concentration point defects induced by equivalent Zn doping on the Mg site significantly enhance phonon scattering and then suppress lattice thermal conductivity by 50% at room temperature. Subsequently, partial substitution of divalent calcium ions with alkali-ion doping (Li, Na, K) not only optimizes the electrical transport properties by increasing the carrier concentration but also further reduces the lattice thermal conductivity through crystal disorder. Finally, the synergistic effect of Zn and Li co-doping leads to a high ZT of similar to 1.0 at 873 K and an average ZT of 0.6 between 300 and 873 K for Ca0.995Li0.005Mg1.9Zn0.1Bi1.98. This work demonstrates an instructive method to reduce the lattice thermal conductivity via doping at the Mg site, which has never been reported in the CaMg2Bi2 system. Moreover, high-performance Ca0.995Li0.005Mg1.9Zn0.1Bi1.98. alloy does not contain any toxic elements and expensive rare earth elements, which is of great significance for the development of environment-friendly thermoelectric materials.

引用

页码：6015 / 6021

页数：7

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