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Electronic Structure and Thermoelectric Properties of Ytterbium-Filled Skutterudites

Published online by Cambridge University Press:  21 March 2011

Hiroaki Anno ,
Kazuhiro Ashida ,
Kakuei Matsubara ,
George S. Nolas ,
Koji Akai ,
Mitsuru Matsuura  and
Jiro Nagao
Hiroaki Anno
Affiliation:
Department of Electronics and Computer Science, Science University of Tokyo in Yamaguchi, 1-1-1 Daigaku-dori, Onoda 756-0884, Japan
Kazuhiro Ashida
Affiliation:
Department of Electronics and Computer Science, Science University of Tokyo in Yamaguchi, 1-1-1 Daigaku-dori, Onoda 756-0884, Japan
Kakuei Matsubara
Affiliation:
Department of Electronics and Computer Science, Science University of Tokyo in Yamaguchi, 1-1-1 Daigaku-dori, Onoda 756-0884, Japan
George S. Nolas
Affiliation:
Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, U.S.A
Koji Akai
Affiliation:
Department of Advanced Materials Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
Mitsuru Matsuura
Affiliation:
Department of Advanced Materials Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
Jiro Nagao
Affiliation:
Institute for Energy Utilization, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-2-1 Tsukisamu-Higashi, Toyohira, Sapporo 062-8517, Japan
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Abstract

The electronic structure and thermoelectric properties of Yb partially filled CoSb3 skutterudite compounds have been investigated by x-ray photoelectron spectroscopy and band calculation in terms of an itinerant f electron model. In these materials, the significant effect of Yb filling is the large reduction of lattice thermal conductivity, remaining relatively high electron mobility and Seebeck coefficient, resulting in high thermoelectric figure of merit. We discuss the effects of the valence fluctuation between Yb2+ and Yb3+ and the strong hybridization of Yb 4f states with the valence band states on the electronic properties and their relation to thermoelectric properties for Yb partially filled CoSb3 compounds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 691: Symposium G – Thermoelectric Materials 2001--Research and Applications , 2001 , G2.4
Copyright
Copyright © Materials Research Society 2002

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References

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