A Mössbauer effect study of structural ordering in rapidly quenched Fe–Ga alloys
Samples of Fe 100− x Ga x ( x=8.3, 17.9, 20.5 and 23.3) were prepared by rapid solidification from the melt using a single Cu roller. X-ray diffraction studies of all samples showed them to be single phase with the disordered BCC structure. No evidence of superlattice reflections from D0 3 ordering...
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Veröffentlicht in: | Journal of magnetism and magnetic materials 2006-10, Vol.305 (2), p.315-320 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Samples of Fe
100−
x
Ga
x
(
x=8.3, 17.9, 20.5 and 23.3) were prepared by rapid solidification from the melt using a single Cu roller. X-ray diffraction studies of all samples showed them to be single phase with the disordered BCC structure. No evidence of superlattice reflections from D0
3 ordering was observed for any of the samples. Room-temperature
57Fe Mössbauer effect spectra indicated that all samples were ferromagnetically ordered. Spectra were fit to distributions of hyperfine fields. The
x=8.3 sample showed a hyperfine field distribution that was single peaked and indicated a reasonably random distribution of local Fe environments. The
x=17.9 and 20.5 samples showed hyperfine field distributions that were bimodal and indicated two distinct local Fe environments. The
x=23.3 sample showed three distinct field components. It is suggested that the
x=8.3, 17.9 and 20.5 alloys are primarily a disordered BCC phase. The
x=8.3 alloy shows a small amount of short-range Ga–Ga pairing, while this short-range pairing is significantly greater in the
x=17.9 and 20.5 alloys. The three field components in the
x=23.3 alloy correspond well to the two sites associated with the D0
3 phase and a third component corresponding to a remaining L1
2 phase suggesting the presence of at least short-range D0
3 clustering in this alloy. |
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ISSN: | 0304-8853 |
DOI: | 10.1016/j.jmmm.2006.01.020 |