SOFT MAGNETIC NANOCRYSTALLINE Ni-Fe-X-Y AND MeFe₂O₄ POWDERS OBTAINED BY MECHANOSYNTHESIS
DOI:
https://doi.org/10.24193/subbphys.2021.02Keywords:
mechanical alloying; Ni-Fe-X-Y alloys; soft ferrite; magnetisation; XRD; DSC.Abstract
The soft magnetic nanocrystalline powders, alloys (Ni3Fe, 79Ni16Fe5Mo, 77Ni14Fe5Cu4Mo, wt. %) and zinc ferrite, were obtained by dry and wet mechanical alloying and reactive milling, followed by different heat treatments. The powders were characterised by X-ray diffraction, scanning electron microscopy, X-ray microanalysis, differential scanning calorimetry, thermomagnetic and magnetic measurements. The X-ray diffraction shown the progressive new phases formation. The crystallite size is between 18-7 nm depending on materials and milling conditions. The particle size is smaller for wet-mechanical alloying comparing with dry-milling. The thermomagnetic measurement shown the Curie temperature of the alloys. The spontaneous magnetisation of the wet-milled and annealed samples is higher than of the molten alloys.
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