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Thermoelectric properties control of Half-Heusler compounds by lattice defects and interfaces introduced based on the close relationship with Heusler compounds

Published online by Cambridge University Press:  06 February 2015

Yoshisato Kimura ,
Yaw-Wang Chai ,
Toshinori Oniki ,
Takahiko Itagaki  and
Shinya Otani
Yoshisato Kimura
Affiliation:
Tokyo Institute of Technology, Materials Science and Engineering, 4259-J3-19 Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan.
Yaw-Wang Chai
Affiliation:
Tokyo Institute of Technology, Materials Science and Engineering, 4259-J3-19 Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan.
Toshinori Oniki
Affiliation:
Tokyo Institute of Technology, Materials Science and Engineering, 4259-J3-19 Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan.
Takahiko Itagaki
Affiliation:
Tokyo Institute of Technology, Materials Science and Engineering, 4259-J3-19 Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan.
Shinya Otani
Affiliation:
Tokyo Institute of Technology, Materials Science and Engineering, 4259-J3-19 Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan.
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Abstract

Half-Heusler MNiSn (M=Ti, Zr, Hf) compounds are well-known, excellent n-type thermoelectric materials. The n-type Seebeck coefficients of ZrNiSn are reduced because of the precipitation of the metallic Heusler ZrNi2Sn phase. An excellent n-type Seebeck coefficient can be converted to p-type based on the vacancy site occupation by the solute Co atoms in the half-Heusler TiNiSn phase as well as ZrNiSn. The Heusler phase precipitates, including their precursor nano-structure in the half-Heusler matrix and the vacancy site occupation of the half-Heusler phase, are regarded as lattice defects based on the crystallographically and thermodynamically close relationship between half-Heusler and Heusler phases.

Keywords

thermoelectriccrystallographic structurephase equilibria
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy05-26
Copyright
Copyright © Materials Research Society 2015 

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References

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