The diffusion of H was studied at 40 to 85C. The results could be described by:

D (cm2/s) = 1.7 x 104 exp[-2.9(kcal/mol)/RT]

V.E.Volkov, R.A.Ryabov, P.V.Geld, G.D.Fedorov: Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, 1972, 1, 127-8