The diffusivities were determined at 20 to 100C. It was found that the results for low H concentrations could be described by:

D (cm2/s) = 4.1 x 10-3 exp[-5.45(kcal/g-atom)/RT]

O.M.Katz, E.A.Gulbransen: Review of Scientific Instruments, 1960, 31, 615