Thermoelectric Properties of the XCoSb (X: Ti,Zr,Hf) Half-Heusler Alloys

被引:16
作者
Gandi, Appala Naidu [1 ]
Schwingenschlogl, Udo [1 ]
机构
[1] KAUST, Phys Sci & Engn Div PSE, Thuwal 239556900, Saudi Arabia
来源
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2017年 / 254卷 / 11期
关键词
half-Heusler alloy; phonon mean free path; Seebeck coefficient; thermal conductivity; thermoelectrics; LONG-TERM STABILITY;
D O I
10.1002/pssb.201700419
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We investigate the thermoelectric properties of the half-Heusler alloys XCoSb (X: Ti, Zr, Hf) by solving Boltzmann transport equations and discuss them in terms of the electronic band structure. The rigid band approximation is employed to address the effects of doping. While many half-Heuser alloys show excellent thermoelectric performance, the materials under study are special by supporting both n-and p-doping. We identify the reasons for this balanced thermoelectric transport and explain why experimentally p-doping is superior to n-doping. We also determine the spectrum of phonon mean free paths to guide grain refinement methods to enhance the thermoelectric figure of merit.
引用
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页数:4
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