Vacuum de-gassing methods, which were based upon non-stationary H permeation, were found to furnish consistent values for diffusivity in the amorphous alloy. It was noted that there was no significant difference between the diffusivity and permeability of H in the amorphous and crystalline states (table 14).
L.A.Andreyev, J.A.Kalashnikova: Fizika Metallov i Metallovedenie, 1987, 64[2], 343-8. (Physics of Metals and Metallography, 1987, 64[2], 125-81)
Table 14
Diffusion of H in Co71Fe5Si15B9
Temperature (K) | Condition | D (cm2/s) |
423 | amorphous | 1.5 x 10-9 |
448 | amorphous | 2.3 x 10-9 |
458 | amorphous | 3.6 x 10-9 |
458 | crystalline | 4.1 x 10-9 |
473 | amorphous | 6.3 x 10-9 |
473 | crystalline | 4.4 x 10-9 |
523 | amorphous | 1.3 x 10-8 |
523 | crystalline | 1.3 x 10-8 |
573 | amorphous | 2.9 x 10-8 |
573 | crystalline | 2.2 x 10-8 |
623 | amorphous | 5.5 x 10-8 |
623 | crystalline | 4.4 x 10-8 |