Preparation and Thermoelectric Properties of Zr1-xTixNiSn0:975Sb0:025 Half-Heusler Alloys

J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (06): 738-741.

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Preparation and Thermoelectric Properties of Zr_1-xTi_xNiSn_0:975Sb_0:025 Half-Heusler Alloys

Cui Yu, Yun Zhang, Tiejun Zhu, Guangyu Jiang, Ji Xu, Bo Zhao, Xinabing Zhao

State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received:2008-09-23 Revised:2009-03-03 Online:2009-11-28 Published:2009-11-24
Contact: Tiejun Zhu
Supported by:
the National High Technology Research and Development Program of China ("863 Program", No. 2007AA03Z234),
the National Basic Research Program of China (No. 2007CB607502)
the National Natural Science Foundation of China (No. 50601022).

Abstract

Abstract:

Zr_1-x Ti_xNiSn_0:975Sb_0:025 (x=0, 0.15, 0.25, 0.5) half-Heusler thermoelectric materials have been prepared by levitation melt, melt spinning and hot pressing. X-ray diffraction analysis and scanning electron microscopy observation showed that nearly single phase half-Heusler compounds were obtained for the levitation-melted ingots. The effects of Ti substitution and grain refinement by melt spinning have been studied. It is found that both the Ti substitution on the Zr site and the grain refinement can reduce the lattice thermal conductivity and total thermal conductivity. The maximum figure of merit ZT value achieved is about 0.47, which is comparable with the previously reported value of ~0.5 for Zr_0:5Ti_0:5NiSn.

Key words: Thermoelectric materials, Thermoelectric Properties, Half-Heusler alloys, Levitation Melting, Grain Refinement

Cui Yu,Yun Zhang,Tiejun Zhu,Guangyu Jiang,Ji Xu,Bo Zhao,Xinabing Zhao. Preparation and Thermoelectric Properties of Zr_1-xTi_xNiSn_0:975Sb_0:025 Half-Heusler Alloys[J]. J Mater Sci Technol, 2009, 25(06): 738-741.

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Preparation and Thermoelectric Properties of Zr_1-xTi_xNiSn_0:975Sb_0:025 Half-Heusler Alloys

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