Abstract
The isotope effect, E=(Dα/Dβ−1)/(mβ/mα−1), of cobalt diffusion in the deeply supercooled liquid state of the bulk metallic glass formers Zr46.7Ti8.3Cu7.5Ni10Be27.5 and Zr65Cu17.5Ni10Al7.5 has been measured employing the radiotracers 57Co and 60Co in conjunction with serial sectioning by means of ion-beam depth profiling. In both alloys a small mass dependence with E≈0.10 is observed. This dependence has no temperature dependence in a range of 120 K in the supercooled liquid state encompassing four orders of magnitude in the diffusivity. We suggest that these results show that long-range diffusion in a deeply supercooled liquid is not mediated by viscous flow but proceeds by collective hopping processes involving about 10 atoms.
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