The diffusivity and migration energy of H at high temperatures were found to be consistent with low-temperature data when the possibility of temporary localization of the H atoms at thermal equilibrium vacancies was taken into account. The migration energy in the perfect lattice was deduced to be 0.52eV, and the pre-exponential factor was 8 x 10-5m2/s. From these data, the H-vacancy binding energy was estimated to be equal to 0.43eV.

Hydrogen Diffusivity in Aluminium.  S.Linderoth: Philosophical Magazine Letters, 1988, 57[4], 229-34