Abstract

The crystal structure of the parent alloy of the series under investigation has four distinct iron sites. Mössbauer spectra of the series with recorded at 293 and 4.2 K and fitted with four components show little site preference for Mn substitution up to x = 0.15. At x = 0.20 evidence for site preference is observed. The magnetic phases at 4.2 K were deduced from changes in the Mössbauer spectra in applied fields. The alloy with x = 0.20 is found to be ferromagnetic. Alloys with x = 0.05, 0.10 and 0.15 show evidence of a canted spin phase. A transition from a canted to a ferromagnetic phase is observed at applied fields T for the x = 0.15 alloy. Phase diagrams constructed from Mössbauer and magnetization results are compared with the predictions of a generalized theoretical model which incorporates ferromagnetic and antiferromagnetic interactions.

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