Proton relaxation times were used to estimate H diffusivities in β-phase Ni5-yAlyLaHx, for y-values of between 0 and 1.2 (table 109). It was found that the substitution of Al significantly increased the observed activation energy, with a corresponding 2-fold increase in the diffusion coefficient at 300K (table 110).

NMR Studies of Hydrogen Diffusion in β-LaNi5−yAly Hydrides. R.C.Bowman: Solid State Communications, 1979, 32[7], 501-6

Table 111

Diffusivity of H in H-Storage Alloys