Abstract
Irreversible structural relaxation processes have been investigated for Fe75B10Si15, Fe78B7Si15 and Fe79B10Si11 amorphous alloys by electrical resistivity measurements and Mössbauer spectroscopy.The electrical resistivity of as-quenched alloys decreased irreversibly with isothermal annealing. Such resistivity changes are mainly associated with decrease of free volume introduced by quenching from the melt. The irreversible decrease of resistivity was reproduced well using the free-volume-Ziman model which was based on the Ziman theory of resistivity and the free-wolume model for viscous flow. The activation energy for annihilation of free volume was evaluated to be 222 kJ/mol (Fe75B10Si15) and 154 kJ/mol (Fe78B7Si15, Fe79B10Si11) from resistivity changes. On the other hand, a significant difference in the annealing behavior of the average isomer shift and internal magnetic field with time between Fe75B10Si15 and Fe78B7Si15 amorphous alloys was observed. This indicates that the local structural change in relaxation process differs much in both amorphous alloys. Such compositional dependence of activation energy and Mössbauer parameters was explained well by the structural model proposed by Dubois et al.
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