Nuclear magnetic resonance techniques were used to study the diffusion of H in hydrided Ti-Nb (table 173). All of the hydrides were single-phase, and had face-centered cubic lattices in which the lattice parameter increased linearly from 0.445nm at 0at%Nb, to 0.4524nm at 70.2at%Nb. Hydrides with Nb contents of up to 94% comprised 2 phases (body-centered cubic phase of NbH type and face-centered cubic phase of TiH2.0 type). When some of the Ti atoms were replaced by Nb atoms, the activation energy increased. This was attributed to the larger effect which was exhibited by the Nb-ion charge than by the effect of lattice dilatation due to the introduction of H.

J.Y.Lileeva, A.A.Chertkov, O.T.Malyuchkov: Izvestiya Vysshikh Uchebnykh Zavedenii (Tsvet. Met.), 1970, 13[3], 123-6

Table 173

Activation Energy for H Diffusion in Ti-Nb at -160 to 250C