Using an isotope-exchange method, studies were made of the self-diffusion of 36Cl ions in powdery crystals at temperatures ranging from 200 to 420C. The activation energy for self-diffusion was found to be equal to 0.95eV at 200 to 330C, and to 1.6eV at 330 to 420C.

Self-Diffusion of Chloride Ions in Manganese Bichloride Crystallites. Y.Sensui: Bulletin of the Chemical Society of Japan, 1972, 45[2], 359-61

Table 114

Thin-Film Diffusion of Ag into a NaCl Substrate