Synthesis and high thermoelectric efficiency of Zintl phase YbCd2-xZnxSb2

被引：179

作者：

Wang, Xiao-Jun ^{[1
]}

Tang, Mei-Bo ^{[1
]}

Chen, Hao-Hong ^{[1
]}

Yang, Xin-Xin ^{[1
]}

Zhao, Jing-Tai ^{[1
]}

Burkhardt, Ulrich ^{[2
]}

Grin, Yuri ^{[2
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 09期

关键词：

antimony alloys; cadmium alloys; carrier density; density functional theory; thermal conductivity; thermoelectricity; ytterbium alloys; zinc alloys; ELECTRON LOCALIZABILITY;

D O I：

10.1063/1.3040321

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We synthesized a series of polycrystalline YbCd2-xZnxSb2 (x=0, 0.4, 0.8, 1, 1.2, 1.6, and 2) samples and measured their thermoelectric properties. Thermoelectric figure of merit ZT at 700 K is higher than 1.0 for Cd-rich samples (x=0, 0.4, 0.8, and 1.0) and Zn substitute of Cd in YbCd2Sb2 can easily tune carrier concentration and reduce thermal conductivity. When x=0.4, sample exhibits the highest power factor (12-20 mu W cm(-1) K-2), the lowest lattice thermal conductivity (1.0 W m(-1) K-1 at 300 K), highest ZT (1.2 at 700 K), and best "self-compatibility." The first principles calculations were performed to study the influences of bonding and electronic structures on physical properties.

引用

页数：3

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