Mössbauer study of structural relaxation in amorphous YFe2 and Fe16Ni62B14Si8

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Abstract
Mössbauer effect of 57Fe in the paramagnetic phase of amorphous YFe2 and Fe16Ni62B14Si8 was measured to investigate a microscopic mechanism of structural relaxation. The Mössbauer spectrum broadens after annealing around 100 °C for YFe2. On the other hand, broadening appears around 100 and 250 °C in Fe16Ni62B14Si8. These broadenings are attributed to disturbances of environment around iron caused by movements of constituent atoms. The quadrupole splitting becomes small owing to a development of topological atomic short range ordering by the annealing in both samples. From these results it is concluded that the structural relaxation of metal‐metalloid glass is divided into two stages. The first stage, below ∼250 °C, is an alloying process between metal atoms. The second stage, above ∼250 °C, is an incipient process of crystallization which is caused by a movement of metalloid atoms.