The permeability time-lag method was used to measure the temperature dependence of H diffusion at 558 to 936C. Within this temperature range, the diffusivity could be described by:

D (m2/s) = 6.48 x 10-7 exp[-26.3(kJ/mol)/RT]

H.Matsuta, R.B.McLellan: Journal of the Physics and Chemistry of Solids, 1979, 40[9], 697-9