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

Mellors, N.J., Zhao, X., Simmons, L.M., Quinn, C.J. and Kilcoyne, Susan H. (2012) A Mössbauer spectroscopy and neutron diffraction study of magnetostrictive, melt-spun Fe-Ga alloy ribbons. Journal of Magnetism and Magnetic Materials, 324 (22). pp. 3817-3823. ISSN 03048853

FeGa_MS_and_ND_Kilcoyne_post_review_resubmission.pdf - Accepted Version

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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 Fe1−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.

Item Type: Article
Uncontrolled Keywords: Melt spun FeGa alloys; Magnetostrictive alloys; Mössbauer spectroscopy; neutron diffraction; Short-range order; Ferromagnetism
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
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Depositing User: Graham Stone
Date Deposited: 04 Jul 2012 14:57
Last Modified: 02 Aug 2012 07:42


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