The diffusive behavior of H in 3N84-purity material was studied at 120 to 600C. The results could be described by:

120-300C:     D (cm2/s) = 9.0 x 10-5 exp[-0.068(eV)/kT]

300-600C:     D (cm2/s) = 5.0 x 10-4 exp[-0.106(eV)/kT]

G.Schaumann, J.Völkl, G.Alefeld: Physica Status Solidi, 1970, 42[1], 401-13

The best linear fits to the solute diffusion data ([1015] to [1019], [1021] to [1030]) yield:

H: Ln[Do] = 0.55E – 9.4 (R2 = 0.92); N: Ln[Do] = 0.23E – 12.2 (R2 = 0.73);

Nb: Ln[Do] = 0.20E – 19.4 (R2 = 0.94)