The behavior of H atoms was investigated by using a resistivity method at temperatures ranging from 293 to 773K. It was found that the diffusivity could be described by:

D (m2/s) = 5.3 x 10-10 exp[-0.8(eV)/kT]

R.Pietrzak, B.Rozenfeld: Journal of the Less-Common Metals, 1990, 162[1], 23-31