The tracer diffusivity of Co in amorphous samples was measured, as a function of pressure, for x-values of between 0.42 and 0.62 (table 126). It was concluded that the activation volume for diffusion in these alloys was between 8 x 10-30 and 2 x 10-29m3, and depended upon the alloy composition. The results were explained in terms of an interstitial-type diffusion mechanism for Co in amorphous Ni-Zr alloys.
H.J.Höfler, R.S.Averback, G.Rummel, H.Mehrer: Philosophical Magazine Letters, 1992, 66[6], 301-6
Table 126
Diffusivity of Co in amorphous NixZr1-xalloys as a function of pressure
x | Pressure (Pa) | D (m2/s) |
42 | 5.000 x 10-7 | 6.66 x 10-21 |
42 | 1.175 x 108 | 7.15 x 10-21 |
42 | 2.760 x 108 | 4.45 x 10-21 |
42 | 3.680 x 108 | 4.91 x 10-21 |
42 | 5.300 x 108 | 3.96 x 10-21 |
52 | 5.000 x 10-7 | 8.28 x 10-21 |
52 | 2.020 x 108 | 5.71 x 10-21 |
52 | 2.760 x 108 | 2.95 x 10-21 |
52 | 3.680 x 108 | 3.29 x 10-21 |
52 | 5.300 x 108 | 2.30 x 10-21 |
57 | 5.000 x 10-7 | 6.17 x 10-21 |
57 | 2.020 x 108 | 4.70 x 10-21 |
57 | 2.655 x 108 | 2.95 x 10-21 |
57 | 3.680 x 108 | 2.55 x 10-21 |
57 | 5.300 x 108 | 1.97 x 10-21 |
62 | 5.000 x 10-7 | 2.15 x 10-21 |
62 | 1.175 x 108 | 1.73 x 10-21 |
62 | 3.680 x 108 | 1.36 x 10-21 |
62 | 5.300 x 108 | 1.25 x 10-21 |