The diffusivity of O in (U0.8Pu0.2)O2 was studied at 1400C. Pellets of the mixed oxide, with a density that was about 95% of the theoretical value, were made into a diffusion couple and annealed under a vacuum of 0.0004Pa. From the results, it was deduced that the diffusivity was 3.5 x 10-9m2/s.

R.Ducroux, A.S.Bayoglu, M.Fromont, R.Lorenzelli: Journal of Nuclear Materials, 1987, 149, 101-2