The impurity diffusion of 22Na in CoO was measured in air by using the tracer-sectioning technique. The results, at 1000 to 1299C, could be described by:

D (cm2/s) = 8.09 x 10-2 exp[-49.19(kcal/mol)]

Cation Impurity Diffusion in CoO and NiO. K.Hoshino, N.L.Peterson: Journal of Physics and Chemistry of Solids, 1984, 45[8-9], 963-72