Quasi-elastic neutron scattering methods were used to study self-diffusion at 76 to 97C. The results could be described by:

D (cm2/s) = 1.2 x 10-1 exp[-0.43(eV)/kT]

M.Ait-Salem, T.Springer, A.Heidemann, B.Alefeld: Philosophical Magazine, 1979, 39[6], 797-814