The migration of H in the Laves-phase cubic hydride, where x ranged from 0.5 to 4.8, was studied by using quasi-elastic neutron scattering and high-resolution back-scattering spectrometry. At temperatures greater than 320K, an homogeneous phase extended across the entire width of the phase diagram. It was found that the tracer diffusion coefficient increased with increasing concentration (table 190). This behavior was tentatively attributed to the occupation of interstitial sites having differing site energies. At low H concentrations, evidence was found for the localized motion of H in the host lattice.

C.Schönfeld, R.Schätzler, R.Hempelmann: Berichte der Bunsengesellschaft für Physikalische Chemie, 1989, 93[11], 1326-30

Table 190

H Diffusion in V2ZrHx at 340K