Radiotracer and conductivity measurements were used to study the movement of cation vacancies, anion vacancies and vacancy pairs in pure and Sr-doped single crystals. The self-diffusivity of Na+ in extrinsic crystals which were doped with 2.7 x 10-5 Sr2+ could be described by:

D (cm2/s) = 3.53 x 10-6 exp[-0.72(eV)/kT]

In the case of intrinsic crystals, the data could be described by:

D (cm2/s) = 33.16 exp[-1.975(eV)/kT]

Conductivity, Transport Numbers and Ion Self-Diffusion in Various Sodium Chloride Single Crystals. F.Bénière, M.Bénière, M.J.Chemla: Journal of Physics and Chemistry of Solids, 1970, 31[6], 1205-20