Diffusion of Ag+, Cl−, and Cd++ in Silver Chloride Single Crystals

The diffusion rates of silver, chlorine, and cadmium ions in single crystals of silver chloride have been investigated by means of a modification of the surface counting method. The diffusion coefficient of the silver ion from 200° to 400°C was represented by the equation D=9.36 exp(−1.01 ev/kT) cm2/sec. Estimates of chloride ion activation energies gave a value of 1.57 ev between 350° and 400°C, and a value of 0.37 ev below 280°C. The silver and chloride ion diffusion data have been compared with results of workers who used sectioning methods. The diffusion coefficient of the cadmium ion may be expressed by the equation D=32.8 exp(−1.36 ev/kT) cm2/sec+2.35×10−5 exp(−0.56/kT) cm2 sec.