Orientation dependence of the evaporation rate of CdS single crystals

Abstract

The vacuum evaporation characteristics of the (0001), (112̄0), and (101̄0) crystal faces of CdS single crystals have been measured in the temperature range of 680°-760° C. From the temperature dependence of the rate, the activation energy of the surface reaction which controls the vaporization of (0001) and (112̄0) faces has been determined. Semisphere shaped crystals are used to study the evaporation of all the orientations simultaneously. The (101̄0) crystal face is unstable under vacuum evaporation conditions. During vaporization the surface area changes drastically; the crystals develop new orientations. The surface areas of the (0001) and (112̄0) crystal faces do not change throughout the evaporation within the accuracy of the experiments. © 1964 The American Institute of Physics.