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Phonons and Thermal Conductivity in Skutterudite Thermoelectrics

Published online by Cambridge University Press:  01 February 2011

C. A. Kendziora  and
G. S. Nolas
C. A. Kendziora
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
G. S. Nolas
Affiliation:
Department of Physics, University of South Florida, Tampa, FL 33620
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Abstract

We study Raman phonon vibrations and relate them to thermal conductivity for empty and filled skutterudites designed for thermoelectric applications, where low thermal conduction is critical. Polarized Raman scattering spectra of crystallite and polycrystalline samples are compared with theoretical predictions and analyzed in comparison to the thermal conduction properties. Our emphasis is on the CoSb3 skutterudite and its filled derivatives, including materials with Ge, Sn, and La in the cages. We observe a strong correlation between aspects of the Raman spectrum and low thermal conductivity. This presents Raman spectroscopy as a characteristic screening tool for potential thermoelectrics and is a crucial step toward predicting lattice thermal conductivities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 793: Symposium S – Thermoelectric Materials 2003 - Research and Applications , 2003 , S4.4
Copyright
Copyright © Materials Research Society 2004

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References

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