The temperature dependence of the diffusivity of vacancies was deduced from the annealing kinetics of voids. The measurements were carried out at temperatures ranging from 473 to 673K. The activation energy for temperatures of between 473 and 573K was estimated to be 2.02eV, but a peculiarity was observed in the diffusion coefficients at temperatures ranging from 573 to 673K (table 42). This was attributed to the effect of an order-disorder transition.
I.Hashimoto, K.Yamamoto: Philosophical Magazine A, 1994, 69[1], 11-7
Table 42
Vacancy Diffusion Coefficients in Cu3Au
Temperature (K) | D (cm2/s) |
473 | 5.25 x 10-20 |
493 | 1.24 x 10-19 |
523 | 1.25 x 10-18 |
533 | 8.25 x 10-18 |
553 | 7.17 x 10-17 |
573 | 3.86 x 10-17 |
613 | 3.33 x 10-17 |
633 | 2.64 x 10-17 |
673 | 3.17 x 10-17 |