A study was made of the diffusivity of Sr2+ ions in material which was doped with various concentrations of impurities. By assuming that the saturation limit of the diffusivity was a function of the impurity doping, the activation enthalpies for solute migration and solute-vacancy association were estimated to be 0.38 and 0.12eV, respectively.

The Effect of Impurity Doping on the Diffusion of Sr2+ in AgCl. A.L.Laskar: Journal of Physics - C, 1978, 11[6], 3397-402