Measurements were made of the tracer diffusivity in amorphous samples which had been prepared by melt-spinning in a vacuum. The diffusivity in as-quenched material was enhanced by the presence of quasi-vacancies. That is, excess free volume. During annealing, the quasi-vacancies were removed and the diffusivity tended to a constant value which depended only upon the temperature. The tracer self-diffusion of 195Au, at 633 to 684K (table 76), could be described by:

D(m2/s) = 0.79 exp[-274(kJ/mol)/RT]

W.Dorner, H.Mehrer: Physical Review B, 1991, 44[1], 101-14

Table 75

Isotope Effect in CoxZr1-x