The impurity diffusion of 95Nb in NiO was measured in air by using the tracer-sectioning technique. The results, at 1102 to 1600C, could be described by:

D (cm2/s) = 6.44 x 10-1 exp[-63.63(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