The time-lag technique was used to study the permeation and diffusion of H in pure α-Fe. It was found that diffusion at between 300 and 700C could be described by:

D (cm2/s) = 9 x 10-4 exp[-2.70(kcal/g-atom)/RT]

V.I.Salii, P.V.Geld, R.A.Ryabov: Fiziko-Khimicheskaya Mekhanika Materialov, 1970, 6[5], 96-8