Gorsky-effect relaxation measurements were used to study the diffusion of H and D in 4N6-purity recrystallized Ta. It was found that the diffusivity of D at temperatures of between 270 and 600K could be described by:

D (cm2/s) = 4.9 x 10-4 exp[-0.163(eV)/kT]

The diffusivity of H within the same temperature range was described by:

D (cm2/s) = 4.4 x 10-4 exp[-0.140(eV)/kT]

The Diffusion Coefficients of Hydrogen and Deuterium in Vanadium, Niobium, and Tantalum by Gorsky-Effect Measurements. G.Schaumann, J.Völkl, G.Alefeld: Physica Status Solidi, 1970, 42[1], 401-13