Electrotransport experiments were performed by using α-phase specimens which had been hydrogenated to H/Ta ratios of 0.10 to 0.15, and subjected to fields of 3 to 5V/m. For temperatures ranging from 0 to 300C, the H mobility could be described by:

m (m2/Vs) = 1.26 x 10-7 exp[-3.40(kcal/mol)/RT]

Thus, the activation energy for H electrotransport was close to that for H diffusion.

J.K.Ivashina, V.F.Nemchenko, A.V.Nemchenko: Fizika Metallov i Metallovedenie, 1977, 44[1], 212-4