Thermal Conductivity of Doped and Pure Cadmium Sulfide

Abstract

The thermal conductivity as a function of temperature has been measured from 1.4 to 80\ifmmode^\circ\else\textdegree\fi{}K for doped and pure cadmium sulfide single crystals. The experimental results for the pure crystals indicate that the thermal conductivity is isotropic and can be successfully analyzed using the Debye thermal conductivity integral. Isoelectronic, substitutional impurities (Co, Mn, Ni, Se, and Zn) were introduced in the melt in concentrations up to 500 ppm. The Debye integral, assuming phonon scattering by dislocations as well as the impurities, gives a good fit to the experimental data for all but the Se-doped crystal. Phonon scattering by magnetic levels was also considered and may explain the low-temperature depression of the thermal conductivity in the 500-ppm Co-doped sample.