The diffusion of 18O was measured at 1175 to 1560C. The diffusion was measured in undoped CoO crystals and in crystals containing from 0.1 to 0.5mol% of aluminum or lithium. The diffusion coefficient in the undoped crystals at P02 = 0.21atm was represented by:

D(cm2/s) = 50 exp[-95000)/RT]

W.K.Chen, R.A.Jackson: Journal of Physics and Chemistry of Solids, 1969, 30[6], 1309-14