Serial sectioning techniques were used to study the diffusion of 109Cd in pure or Cd-doped single crystals. In the case of pure AgCl at 80 to 280C, the results could be described by:

D (cm2/s) = 8.22 x 10-6 exp[-0.57(eV)/kT]

At temperatures ranging from 280 to 445C, the results could be described by:

D (cm2/s) = 4.26 exp[-1.20(eV)/kT]

The data for the entire temperature range could be described by:

D (cm2/s) = 51.21 exp[-1.34(eV)/kT] + 6.34 x 10-6 exp[-0.56(eV)/kT]

This behavior could be explained by assuming that mass transport involved a vacancy mechanism at higher temperature, and a contribution to mass transport which arose from the interstitial motion of interstitial Cd ions at lower temperatures.

E.W.Sawyer, A.L.Laskar: Journal of the Physics and Chemistry of Solids, 1972, 33[5], 1149-57