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Thermal Conductivity of Fe-Doped Cosb3 Skutterudites

Published online by Cambridge University Press:  10 February 2011

Kevin L. Stokes ,
A. C. Ehrlich  and
G. S. Nolas
Kevin L. Stokes
Affiliation:
Advanced Materials Research Institute, University of New Orleans, New Orleans, LA
A. C. Ehrlich
Affiliation:
Materials Physics Branch, Naval Research Laboratory, Washington, DC
G. S. Nolas
Affiliation:
Research and Development Division, Marlow Industries, Inc., Dallas TX
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Abstract

We investigate the effect of Fe substitution for Co on the lattice thermal conductivity of CoSb3 skutterudites. The polycrystalline materials are formed from uniaxially hot-pressed powders. Three alloys were prepared with 0, 3% and 10% Fe, respectively. Thermal conductivity measurements were made between 80 K to 450 K. The lattice thermal conductivity of 10%Fe:CoSb3 is approximately two times smaller than the lattice thermal conductivity of CoSb3 over the entire temperature range. This effect cannot be accounted for by the phenomenlogical theory considering only the mass difference and strain field due to the alloying (Fe) atom. Other phonon scattering mechanisms are discussed. Comparison is made with the partially-filled skutterudite alloy, La0.65Fe2.8Co1.1Sb12.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 545: Symposium Z – Thermoelectric Materials 1998 - The Next Generation… , 1998 , 339
Copyright
Copyright © Materials Research Society 1999

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