Structure and Magnetic Properties of Nanocrystalline Fe--Mo Alloys Prepared by Mechanosynthesis
M. Karolusa, E. Jartychb and D. Oleszakc
aInstitute of Physics and Chemistry of Metals, University of Silesia, Bankowa 12, 40-007 Katowice, Poland
bDepartment of Experimental Physics, Institute of Physics Technical University of Lublin, Nadbystrzycka 38, 20-618 Lublin, Poland
cWarsaw University of Technology Department of Materials Science and Engineering Wo³oska 141, 02-507 Warsaw, Poland
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Nanocrystalline samples of Fe80Mo20 and Fe50Mo50 alloys were prepared by the mechanical milling method. The structure, lattice parameters, and crystallite size were determined by the X-ray diffraction. The magnetic properties of the milled products were determined by the Mössbauer spectroscopy. It was observed that in the case of the Fe80Mo20 alloy a solid solution of Mo in Fe was formed with the lattice parameters of Fe increasing from 0.28659 nm to 0.29240 nm and the crystallite size decreasing from 250 nm to 20 nm. In the case of the Fe50Mo<{50}> alloy there were no clear changes in values of the lattice parameters of Fe and Mo during the milling process, but the crystallite size decreased from 200 nm to 15 nm. Mössbauer spectra revealed different magnetic phases in the mechanosynthesized Fe--Mo samples. In the case of the Fe80Mo20 alloy, the spectrum for the milled mixture indicated the formation of a solid solution. In contrast, for the Fe50Mo50 the spectrum indicated the disappearance of the ferromagnetic phase.
DOI: 10.12693/APhysPolA.102.253
PACS numbers: 61.10.Eq, 07.85.Jy, 81.07.Bc, 81.07.Wx, 61.18.Fs, 87.64.Pj