The diffusivity of H in the hydride, Ti2NiH2, was found to be described by:

D (cm2/s) = 2 x 10-4 exp[-0.345(eV)/kT]

at between 428 and 523K.

Determination of the Hydrogen Diffusion Coefficient in Ti2Ni by Means of Quasielastic Neutron Scattering. E.Lebsanft, D.Richter, J.M.Töpler: Zeitschrift für Physikalische Chemie, 1979, 116, 175-83. See also: J.Töpler, E.Lebsanft, R.Schätzler: Journal of Physics F, 1978, 8[2], L25-8