Standard permeation equipment and manometric measurements were used to determine H diffusion and permeation data. The results could be summarised by:

bulk: D (cm2/s) = 2.52 x 10-3 exp[-7.96(kcal/g-atom)/RT]

grain boundaries: D (cm2/s) = 2.27 x 10-3 exp[-8.2(kcal/g-atom)/RT]

V.M.Sidorenko, I.I.Sidorak: Fiziko-Khimicheskaya Mekhanika Materialov, 1973, 9[4], 12-6