Measurements were made of tracer diffusivity in amorphous samples which had been prepared by melt-spinning in vacuum. The diffusivity in as-quenched material was enhanced by the presence of quasi-vacancies (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, could be described by:

D (cm2/s) = 7.90 x 103 exp[-274(kJ/mol)/RT]

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