Chronopotentiometric methods were used to investigate the diffusion of Nb3+ in eutectic melts. The diffusivity of Nb3+ (0.6 to 1.2%Nb), at temperatures of 400 to 610C, could be described by:

D (cm2/s) = 2.18 x 10-3 exp[-7.0(kcal/mol)/RT]

V.F.Pimenov, Y.V.Baimakov: Electrokhimiya, 1968, 4[11], 1357-60