The migration of D and H was measured by using a steady-state method. It was found that both isotopes moved towards the cooler end. The heat of transport of H was equal to 28.5kJ/mol at 370 to 440C, while that for D was equal to 39.6kJ/mol at 370 to 430C.

Thermomigration of Hydrogen and Deuterium in Vanadium, its Alloys, Niobium and Tantalum. H.Nakajima, M.Yoshioka, M.Koiwa: Transactions of the Japan Institute of Metals, 1987, 28[12], 949-56

Figure 16

Diffusivity of H in Nb-V

(open squares: Nb0.75V0.25, filled squares: Nb0.90V0.10)