Neutron activation and spreading methods were used to study diffusion in 5N-purity material at 93 to 145C. The results could be described by:

D (cm2/s) = 2.2 x 10-1 exp[-0.60(eV)/kT]

J.J.B.Prasad, K.V.Reddy: Indian Journal of Pure and Applied Physics, 1983, 21[7], 391-4