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

Mellors, NJ, Zhao, X, Simmons, LM, Quinn, CJ and Kilcoyne, SH 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. (In Press)

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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 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.

    Item Type: Article
    Uncontrolled Keywords: Melt spun FeGa alloy; Magnetostrictive alloy; Mössbauer spectroscopy; Neutron diffraction; Short-range order; Ferromagnetism
    Themes: Energy
    Schools: Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics Research Centre
    Journal or Publication Title: Journal of Magnetism and Magnetic Materials
    Publisher: Elsevier
    Refereed: Yes
    ISSN: 0304-8853
    Funders: European Commission Sixth Framework Programme (FP6)
    Depositing User: NJ Mellors
    Date Deposited: 24 Jul 2012 09:51
    Last Modified: 28 Jan 2014 17:18

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