Influence of point-defect scattering on the lattice thermal conductivity of solid solution Co(Sb1-xAsx)3 -: art. no. 235209

We have investigated the transport properties of solid solutions of skutterudites based on Co(Sb1-xAsx)(3). Homogeneous solid solutions were prepared with As content x <= 0.1. The influence of point-defect scattering on the lattice thermal conductivity has been studied in detail. The lattice thermal conductivity decreases with the increasing content of As at all temperatures from 2 K to 700 K. Theoretical analysis indicates that the reduction of the lattice thermal conductivity with increasing As concentration can be explained by the enhanced point-defect scattering due to mass fluctuations and strain field fluctuations as As atoms substitute on the Sb sublattice.