The self-diffusion coefficient of Al was determined in polycrystalline aluminum oxide at 1670 to 1905C. Diffusion couples were employed which used 26Al in oxide form as a radioactive tracer. Within the above temperature range, the experimental data were represented by:

D(cm2/s) = 28 exp[-(114000)/RT]

A.E.Paladino, W.D.Kingery: The Journal of Chemical Physics, 1962, 37[5], 957-62