The pressure and temperature dependences of the diffusivity of 60Co in melt-spun metallic glass and face-centered cubic Co were studied by using radio-tracer, ion-beam sputtering serial sectioning, electron microprobe analysis, X-ray diffraction, and differential scanning calorimetry techniques. No pressure dependence of the diffusivity in the amorphous alloy was detected, whereas there was a slight dependence in the case of Co. The activation volume was estimated to be equal to 6% of the atomic volume of Co. It was concluded that diffusion in the metallic glass did not involve quasi-vacancies in thermal equilibrium, and could be described by:

D (m2/s) = 0.001 exp[-2.3(eV)/kT]

K.Rätzke, F.Faupel: Physical Review B, 1992, 45[13], 7459-62