The electrical resistivity of TaHx specimens, where x ranged from 0.025 to 0.27, was studied after preparation via the cathodic charging of 3N-purity Ta. From these results, the activation energy for H self-diffusion was calculated to be 4.17kcal/mol.
T.Matsuyama, S.Dohi, K.Hirano: Japanese Journal of Applied Physics, 1973, 12[4], 609-10
Table 231
Diffusivity of H and D in Ta
Isotope | Temperature (C) | D (cm2/s) |
H | 0 | 5.6 x 10-7 |
H | 22 | 9.9 x 10-7 |
H | 30 | 1.04 x 10-6 |
H | 46 | 1.36 x 10-6 |
H | 60 | 1.65 x 10-6 |
H | 77 | 2.20 x 10-6 |
H | 100 | 3.10 x 10-6 |
H | 125 | 5.7 x 10-6 |
H | 150 | 7.7 x 10-6 |
H | 175 | 7.8 x 10-6 |
H | 205 | 1.24 x 10-5 |
H | 225 | 1.11 x 10-5 |
H | 250 | 1.33 x 10-5 |
H | 302 | 2.00 x 10-5 |
D | 0 | 2.4 x 10-7 |
D | 30 | 4.8 x 10-7 |
D | 60 | 9.6 x 10-7 |
D | 77 | 1.13 x 10-6 |
D | 100 | 1.80 x 10-6 |
D | 125 | 2.9 x 10-6 |
D | 150 | 3.5 x 10-6 |
D | 175 | 5.4 x 10-6 |
D | 205 | 7.6 x 10-6 |
D | 225 | 8.0 x 10-6 |
D | 225 | 7.3 x 10-6 |
D | 250 | 1.06 x 10-5 |
D | 400 | 2.72 x 10-5 |