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Structure and hyperfine interactions of melt-spun Fe80Mo7X1B12(X = Cu or Au) before and after transformation into nanocrystalline states

Content Provider	Scilit
Author	Miglierini, Marcel Tóth, I. Seberíni, M. Illeková, E. Idzikowski, Bogdan
Copyright Year	2002
Description	Journal: Journal of Physics: Condensed Matter Mössbauer spectrometry $(^{57}$Fe transmission and conversion-electron techniques), differential scanning calorimetry, and x-ray diffraction are employed to study the microstructure and magnetism of amorphous and nanocrystalline $Fe_{80}Mo_{7}X_{1}B_{12}$ (X = Cu, Au) alloys. Heat treatment of amorphous specimens below the temperature of primary crystallization causes structural relaxation that, in turn, stabilizes the amorphous arrangement. Changes observed in the topological short-range order are more pronounced for X = Au because this alloy shows a higher degree of disorder in the bulk of the as-quenched state. For both alloys, three-step crystallization behaviour is observed. Annealing performed in temperature range of the first crystallization provided different amounts of body-centred-cubic Fe nanograins. Magnetic interactions among them and their impact on the surrounding amorphous residual matrix are discussed using hyperfine-field distributions. Differences in hyperfine interactions between surface regions and bulk of the alloys are revealed from conversion-electron Mössbauer spectrometry and transmission Mössbauer effect measurements, respectively. The magnetic behaviours for X = Cu and Au are very similar after annealing at temperatures close to and beyond the end of the first crystallization peak. The impact of which element is present on the microstructure and magnetism is crucial during the commencement of the crystallization but it cannot be discerned for higher crystalline contents.
Related Links	http://iopscience.iop.org/article/10.1088/0953-8984/14/6/312/pdf
Ending Page	1260
Page Count	12
Starting Page	1249
ISSN	09538984
e-ISSN	1361648X
DOI	10.1088/0953-8984/14/6/312
Journal	Journal of Physics: Condensed Matter
Issue Number	6
Volume Number	14
Language	English
Publisher	IOP Publishing
Publisher Date	2002-01-31
Access Restriction	Open
Subject Keyword	Journal: Journal of Physics: Condensed Matter Condensed Matter Physics Differential Scanning Calorimetry X Ray Diffraction
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science

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