Does the diffusion mechanism in thin amorphous Co81Zr19 films change during structural relaxation?

Details Does the diffusion mechanism in thin amorphous Co81Zr19 films change during structural relaxation? Does the diffusion mechanism in thin amorphous Co81Zr19 films change during structural relaxation?

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001njph....3....6h&link_type=abstract

New Journal of Physics, Volume 3, Issue 1, pp. 6 (2001).

Physics

2

Scientific paper

In order to clarify the diffusion mechanisms in metallic glasses we measured the time dependence and the isotope effect E = (D_α/D_β-1)/(√{m_β/m_α}-1) of Co diffusion in thin 1 μm amorphous Co81Zr19 films during structural relaxation. To observe diffusion on a nanometre scale the radiotracer technique in conjunction with serial sectioning in conjunction with ion-beam sputtering was employed. A drop of the diffusivity by a factor of three was found during structural relaxation at T = 573 K, but no change in E was observed. Small isotope effects of E = 0.00(2) in the relaxed and even in the as-quenched states in the present alloy strongly suggest collective hopping diffusion mechanisms in the relaxed as well as in the as-quenched states. These results are in good accordance with results in thin 1 μm amorphous Co51Zr49 films. The results are compared to measurements in melt-spun amorphous Co76.7Fe2Nb14.3B7, where a drastic drop of E during relaxation has been observed. We further discuss the results with respect to measurements in melt-spun Co89Zr11 ribbons to clarify the mechanism of annealing defects. The absence of any geometry effect seems to rule out annihilation of quenched-in free volume at the outer surface in thin Co-Zr glasses.

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