The diffusivities were determined at 190 to 400C. It was found that the results for low H concentrations could be described by:

D (cm2/s) = 7.2 x 10-3 exp[-5.72(kcal/g-atom)/RT]

W.Jost, A.Widmann: Zeitschrift für Physikalische Chemie - B, 1935, 29, 247