Thermal conductivity of gallium antimonide crystals under conditions of uniform compression

Abstract

Experimental studies of the thermal conductivity of single-crystal and polycrystalline gallium antimonide samples are performed by an absolute method under steady-state thermal conditions in the temperature range of 273–423 K under uniform compression at pressures from atmospheric to 0.35 GPa. Mechanisms responsible for heat transfer under these conditions are revealed. The Bridgman parameter characterizing the volume dependence of the thermal conductivity is determined. It is shown that the difference in magnitudes of the single crystal and polycrystals thermal conductivity is associated with phonon scattering by defects in boundary layers of crystallites. The correlation between the thermal conductivity under uniform compression and the change in the crystal phonon spectrum and elastic anisotropy is determined.