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Thermoelectric Properties of Half-Heusler Compounds N-type MNiSn and P-type MPtSn (M = Hf, Zr)

Published online by Cambridge University Press:  26 February 2011

Yoshisato Kimura ,
Tomoya Kuji ,
Akihisa Zama ,
Taiki Lee  and
Yoshinao Mishima
Yoshisato Kimura
Affiliation:
kimurays@materia.titech.ac.jp, Tokyo Institute of Technology, Materials Science and Engineering, 4259-G3-23 Nagatsuta, Midori-ku, Yokohama, N/A, Japan, +81-45-924-5157, +81-45-924-5157
Tomoya Kuji
Affiliation:
kuji@materia.titech.ac.jp, Tokyo Institute of Technology, Graduate student, Materials Science and Engineering, 4259-G3-23 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
Akihisa Zama
Affiliation:
zama@materia.titech.ac.jp, Tokyo Institute of Technology, Graduate student, Materials Science and Engineering, 4259-G3-23 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
Taiki Lee
Affiliation:
leetaiki@materia.titech.ac.jp, Tokyo Institute of Technology, Graduate student, Materials Science and Engineering, 4259-G3-23 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
Yoshinao Mishima
Affiliation:
mishima@materia.titech.ac.jp, Tokyo Institute of Technology, Materials Science and Engineering, 4259-G3-23 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan
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Abstract

To design and to develop Half-Heusler based high-temperature thermoelectric materials, thermoelectric properties of n-type MNiSn and p-type MPtSn (M = Hf, Zr) were investigated based on two respective strategies. For the n-type (Hf, Zr)NiSn, a combined process of optical floating zone melting and hot-pressing was applied aiming to reduce thermal conduction through the lattice contribution. For the p-type HfPtSn, power factor and hence figure of merit ZT were dramatically improved by the p-type doping of Ir and Co targeting for Pt-site, which effectively lower electrical resistivity. The additions of Ir and Co are expected not only to increase carrier concentration but also to suppress the lattice thermal conduction by substituting for Pt.

Keywords

thermoelectricitythermal conductivityelectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II04-03
Copyright
Copyright © Materials Research Society 2007

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References

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