A study was made of the diffusion of Co2+ along the grain boundaries of bicrystals, by using autoradiographic analysis, micro-hardness measurements and micro X-ray spectral analysis. It was deduced that the bulk diffusivity at temperatures ranging from 200 to 650C could be described by an activation energy of 0.20eV. Cation Diffusion along Boundaries in Alkali Halide Bicrystals. J.E.Geguzin: Fizika Tverdogo Tela, 1966, 8[11], 3248-53

Figure 13

Diffusion of Co in KCl