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A New Class of Materials with Promising Thermoelectric Properties: MNiSn (M = Ti, Zr, Hf)

Published online by Cambridge University Press:  15 February 2011

H. Hohl ,
A. P. Ramirez ,
W. Kaefer ,
K. Fess ,
Ch. Thurner ,
Ch. Kloc  and
E. Bucher
H. Hohl
Affiliation:
Lucent Technologies, Bell Laboratories, 700 Mountain Avenue, Murray Hill, NJ 07974
A. P. Ramirez
Affiliation:
Lucent Technologies, Bell Laboratories, 700 Mountain Avenue, Murray Hill, NJ 07974
W. Kaefer
Affiliation:
University of Konstanz, Faculty of Physics, P.O. Box 5560, D-78457 Konstanz, Germany
K. Fess
Affiliation:
University of Konstanz, Faculty of Physics, P.O. Box 5560, D-78457 Konstanz, Germany
Ch. Thurner
Affiliation:
University of Konstanz, Faculty of Physics, P.O. Box 5560, D-78457 Konstanz, Germany
Ch. Kloc
Affiliation:
University of Konstanz, Faculty of Physics, P.O. Box 5560, D-78457 Konstanz, Germany
E. Bucher
Affiliation:
Lucent Technologies, Bell Laboratories, 700 Mountain Avenue, Murray Hill, NJ 07974 University of Konstanz, Faculty of Physics, P.O. Box 5560, D-78457 Konstanz, Germany
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Abstract

TiNiSn, ZrNiSn and HfNiSn are members of a large group of intermetallic compounds which crystallize in the cubic MgAgAs-type structure. Polycrystalline samples of these compounds have been prepared and investigated for their thermoelectric properties. With thermopowers of about –200 μV/K and resistivities of a few mΩcm, power factors S2/ρ as high as 38 μW/K2 cm were obtained at 700 K. These remarkably high power factors are, however, accompanied by a thermal conductivity which is too high for applications. In order to reduce the parasitic lattice thermal conductivity, solid solutions Zrl−xHfxNiSn, Zrl−xTixNiSn, and Hfl−xTixNiSn were formed. The figure of merit of Zr0.5Hf0.5NiSn at 700 K (ZT = 0.41) exceeds the end members ZrNiSn (ZT = 0.26) and HfNiSn (ZT = 0.22).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 478: Symposium Q – Thermoelectric Materials - New Directions and Approaches , 1997 , 109
Copyright
Copyright © Materials Research Society 1997

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