(Zr,Hf)Co(Sb,Sn) half-Heusler phases as high-temperature (>700 °C) p-type thermoelectric materials

被引：196
作者：
Culp, Slade R. [2 ]
Simonson, J. W. [2 ]
Poon, S. Joseph [2 ]
Ponnambalam, V. [1 ]
Edwards, J. [1 ]
Tritt, Terry M. [1 ]
机构：
[1] Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA
[2] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA
来源：
APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 02期
关键词：
D O I：
10.1063/1.2959103
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
By substituting Sn for Sb, the potential of stable (Zr,Hf)Co(Sb,Sn) half-Heusler phases, as p-type thermoelectric materials, for high-temperature power generation has been examined. Sn concentration as much as similar to 20% -30% is required to realize high power factor values. Substitution of heavier Hf, which reduces the thermal conductivity (kappa) via mass fluctuation scattering, nonetheless maintains high mobility. As a result, the thermoelectric figure of merit ZT, for these not-yet-optimized materials, which we found to be ZT=0.5 at 1000 K (measured) and ZT=0.6 at 1100 K (extrapolated), surpasses the industry benchmark for a p-type material set by SiGe alloys. (C) 2008 American Institute of Physics.
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