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Effect of substitutional doping on the thermal conductivity of Ti-based Half-Heusler compounds

Published online by Cambridge University Press:  01 February 2011

S. Bhattacharya ,
V. Ponnambalam ,
A.L. Pope ,
Y. Xia ,
S.J. Poon ,
R.T. Littleton IV  and
T.M. Tritt
S. Bhattacharya
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC, USA
V. Ponnambalam
Affiliation:
Department of Physics, University of Virginia, Charlottesville, VA, USA
A.L. Pope
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC, USA
Y. Xia
Affiliation:
Department of Physics, University of Virginia, Charlottesville, VA, USA
S.J. Poon
Affiliation:
Department of Physics, University of Virginia, Charlottesville, VA, USA
R.T. Littleton IV
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC, USA
T.M. Tritt
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC, USA
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Abstract

Half-Heusler alloys with the general formula TiNiSn1-XSbX are currently being investigated for their potential as thermoelectric (TE) materials. 1,2,3,4 These materials exhibit high thermopower (40–250μV/K) and low electrical resistivity values (0.1 - 8mΩ-cm) which yields a relatively large power factor (α2σT) of (0.2 - 1.0) W/m♦K at room temperature. The challenge is to reduce the relatively high thermal conductivity (≈ 10 W/m♦K) that is evident in these materials. The focus of this research is to investigate the effect of Sb-doping on the Sn site and Zr doping on the Ti site on the thermal conductivity of TiNiSn. Highly doped half-Heusler alloys have shown marked reduction in thermal conductivity to values on the order of 3.5 - 4.5 W/m♦K. Systematic determination of thermal conductivity in a variety of these doped materials as well as Sb and Zr doped TiNiSn are presented and discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 626: Symposium Z – Thermoelectric Materials 2000 - The Next Generation Materials for Small-Scale Refrigeration and Power Generation Applications , 2000 , Z5.2
Copyright
Copyright © Materials Research Society 2000

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References

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