Abstract

Mössbauer spectroscopy is used to study the crystallization of amorphous transition metal-metalloid alloys. Simultaneous measurements of γ-transmission spectra and conversion electron emission spectra show that on all samples measured the crystallization starts at the ribbon surface. When the annealing is done in vacuum, the first traces of crystalline phases appear on the dull ribbon surface which had been in contact with the quenching roller. If an argon atmosphere is used during the heat treatment the onset of crystallization is first observed on the shiny ribbon surface. The crystallization temperature also depends on the atmosphere used during annealing.

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