Abstract
Reversible structural relaxation in two FeBSi amorphous alloys, Fe 78B 7Si 15 and Fe 75B 10Si 15, has been studied through measurements of the electrical resistance and relaxation enthalpy using a differential scanning calorimeter. Both alloys exhibited reversible changes of these physical properties due to the reversible relaxation. Larger reversible changes were observed in Fe 78B 7Si 15 than in Fe 75B 10Si 15. This result can be well explained by the idea that the reversible relaxation is caused by changes in chemical short-range order among iron and silicon atoms according to Dubois and Le Caer's structural model of amorphous alloys. The activation energy spectrum characterizing the reversible relaxation process was obtained from reversible enthalpy changes during isothermal annealing at 500 K. It results in an asymmetric gaugassian-like distribution with a peak maximum at 1.7 eV.
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