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Phase Stability and Thermoelectric Properties of Half-Heusler Compounds (Ti,M)NiSn (M = Zr, Hf)

Published online by Cambridge University Press:  31 January 2011

Takahiro Kenjo ,
Yoshisato Kimura  and
Yoshinao Mishima
Takahiro Kenjo
Affiliation:
kenjyo.t.aa@m.titech.ac.jp, Tokyo Institute of Technology, Materials Science and Engineering, Yokohama, Japan
Yoshisato Kimura
Affiliation:
kimura.y.ac@m.titech.ac.jp, Tokyo Institute of Technology, MS&E, 4259-G3-23 Nagatsuta, midori-ku, Yokohama, 226-8502, Japan, +81-45-924-5157
Yoshinao Mishima
Affiliation:
mishima.y.ab@m.titech.ac.jp, Tokyo Institute of Technology, Yokohama, Japan
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Abstract

Aiming to improve thermoelectric properties of half-Heusler compounds MNiSn (M = Ti, Zr, Hf), phase equilibria in the (Ti,M)NiSn systems have been investigated focusing on the half-Heusler phase separation between TiNiSn and ZrNiSn, TiNiSn and HfNiSn. Solubility limit of an element M in each half-Heusler phase was determined by XRD and EPMA. Nearly single phase alloys were fabricated by the directional solidification using optical floating zone melting method to evaluate intrinsic thermoelectric properties of the alloys. Lattice thermal conductivity can be reduced in (Ti,M)NiSn alloys by phonon scattering due to the solid solution effect of M site substitution. Moreover, electrical properties can be enhanced by the Ti addition in (Ti,Zr)NiSn alloys. Among present MNiSn alloys, (Ti0.15,Zr0.85)NiSn alloy has the highest power factor of 5.3 mWm-1K-2 at around 745 K.

Keywords

thermoelectricphase equilibriamicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1218: Symposium Z – Energy Harvesting–From Fundamentals to Devices , 2009 , 1218-Z05-14
Copyright
Copyright © Materials Research Society 2010

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