The thermotransport of the isotopes in V-based alloys was found to be slower than that in pure V. The addition of V to Nb also increased the thermotransport of D and H, with respect to that in pure Nb. The heat of transport was positive, and was markedly greater for D than for H (table 187). It was concluded that the results were consistent with an atomistic model in which the temperature-dependence of the atomic jump frequencies was the predominant factor. There was a small bias in the direction of the atomic jumps. It was proposed that the differences between the heats of transport, for H and D, were related to an isotope-effect in the activation energy for diffusion.

Thermotransport of Hydrogen and Deuterium in Vanadium-Niobium, Vanadium-Titanium, and Vanadium-Chromium Alloys. D.T.Peterson, M.F.Smith: Metallurgical Transactions A, 1983, 14[5], 871-4

Figure 38

Diffusivity of H in V-Cr and V-Ti

(squares: V, circles: V0.9Cr0.1, triangles: V0.96Cr0.04, stars: V0.97Cr0.03, crosses: V0.92Cr0.08)