A study was made of the diffusion of Cu, from CuCl vapor, into single crystals. The diffusion profiles of the Cu ions were deduced by measuring the characteristic light absorption of Cu ions in alkali chlorides. It was found that, at temperatures ranging from 350 to 650C, the diffusion data could be described by:

D (cm2/s) = 10.6 exp[-1.23(eV)/kT]

Diffusion of Cu Ions in Alkali Chlorides. K.Haneda, T.Ikeda, S.Yoshida: Journal of the Physical Society of Japan, 1968, 25, 643