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Journal Article (Refereed)
July 2012

A Mössbauer spectroscopy and neutron diffraction study of magnetostrictive, melt-spun Fe¿Ga alloy ribbons

Mellors, N & Zhao, X & Quinn, C & Simmons, L & Kilcoyne, S 2012, 'A Mössbauer spectroscopy and neutron diffraction study of magnetostrictive, melt-spun Fe¿Ga alloy ribbons', Journal of Magnetism and Magnetic Materials.

Abstract

Abstract

Ribbons of Fe100−xGax (x=15, 17.5, 19.5 and 22.5) were prepared by rapid solidification from the melt. 57Fe Mössbauer spectroscopy and high resolution neutron diffraction have revealed that Fe100−xGax alloys with x=15 and 17.5 have the disordered bcc (A2) structure even after annealing, but the alloy with x=19.5 developed the short-range ordered D03 phase when annealed. The x=22.5 alloys showed mainly D03 phase with a fraction of bcc phase. A fraction of the bcc phase transformed into D03 phase and the long-range ordering of D03 phase was improved after annealing. 57Fe Mössbauer spectra showed no observable L12 phase in any samples even though less than 1% volume of L12 phases has been found in the annealed samples by neutron diffraction. The additional absorption at hyperfine field of 25 T in x=22.5 samples was regarded as a result of imperfect D03 structure, rather than L12 phase.


Publication Details

Journal Name
Journal of Magnetism and Magnetic Materials