ANISOTROPIC THERMAL CONDUCTIVITY OF ELECTRON-IRRADIATED CdS

Measurements of the low temperature thermal conductivity of electron-irradiated CdS were made on irradiation and annealing. The measurements show that primary defects move at temperatures as low as 35°K in CdS. After annealing above 60°K, an anisotropic thermal conductivity is developed which is attributed to the formation of anisotropic phonon scatterers. The preferred orientation of the anisotropic defects is along the c axis, and the equilibrium energy difference for reorientation is ∼1.5 × 10−3 eV.