Low-temperature thermal properties of n-type partially filled calcium skutterudites
Résumé
The low-temperature thermal properties of polycrystalline CaxCo4Sb12 skutterudite samples have been investigated between 10 and 300 K for different x contents. The compounds were synthesized via solid-state reactions. The lattice thermal conductivity is found to decrease drastically with the increasing content of Ca at any temperature considered. Our theoretical analysis puts forward that this reduction can be explained by phonon–point defect scattering due to both mass fluctuations and strain field scattering on the 2a crystallographic position and also to phonon resonance scattering.
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