Abstract
The changes in the microscopic state of Fe-site surroundings during structural relaxation in a (Co0.75Fe(0.25)75 Si10 B15 metallic glass which shows a remarkable reversible relaxation were examined using Mossbauer-effect measurements at 300 K. The narrowing of the distributions in the magnetic hyperfine field,Hi, and in the isomer shift, δis, and the separation into two parts in the quadrupole splitting, δQS, due to irreversible and reversible relaxations were clearly observed. A shift towards higher values in the meanHi and a decrease in the mean δis were also found in both relaxations. The features of the changes inHi, δi and δQS strongly support the theory that the irreversible structural relaxation corresponds to topological short-range ordering which is mainly due to the ordering of Si and B atoms (that is, from random distributions to well-defined positions) and the theory that the reversible structural relaxation arises mainly from chemical short-range ordering between Co and Fe atoms.
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