The boundary conditions for electrochemical permeation through annealed α-phase material were considered, and the diffusion coefficients were measured at 278 to 333K. It was found that the results, for diffusion which was free of trapping and surface effects, could be described by:

D (cm2/s) = 2.40 x 10-3 exp[-5.1(kcal/mol)/RT]

H.Hagi: Journal of the Japan Institute of Metals, 1989, 53[8], 753-8