The temperature dependence of the diffusivity was determined using the permeability time-lag method. This was calibrated by measuring the diffusivity in pure Ni. In the case of Ni-V alloys, the ratio of the number of H atoms to the total number of Ni and V atoms was always less than 10-6. At 570 to 1370K, the diffusivity obeyed an Arrhenius relationship for all of the alloys (table 103), and the effect of V was very small; even at high concentrations. The results were explained by using a simple model in which a decrease in H mobility, caused by trapping sites around the V atoms, was assumed to be compensated by an increased mobility due to the associated lattice dilation.Diffusivity of Hydrogen in Nickel-Vanadium Solid Solutions. W.M.Yei, R.B.McLellan: Acta Metallurgica, 1980, 28[10], 1437-42

Table 103

Parameters for H Diffusion in Ni-V