A Mössbauer study of amorphous alloy Fe67Co18B14Si1

Abstract

Amorphous alloy Fe67Co18B14Si1 (METGLAS 2605CO) has been studied by Mössbauer Spectroscopy in the temperature range 80 K - 900 K. Non-crystalline nature of the alloy is reflected in the observed broad and overlapping Mössbauer six-line pattern from 80 K - 630 K. Amorphous sample crystallizes at 650 K before becoming paramagnetic in the amorphous state. The Curie temperature has been estimated to be 830 ± 10 K. Heff(T)/Heff(O) vs (T/TC) data has been fitted to the Handrich model of an amorphous ferromagnet in which the fluctuation exchange parameter has been taken as δ = 0.6(1-T2/TC2). Heff(T) has also been found proportional to (T/TC) 3 2 with a slope B 3 2 - 0.43±0.05. Initial crystallization studies by Mössbauer Spectroscopy and X-rays indicate that the crystallized products do not contain α-Fe but most probably FeB and (FeCo)B alloys. © 1984.