Abstract
Nickel ferrite powders with a nominal NiFe2O4 composition were synthesized by combustion reaction using urea as fuel. The powder was obtained using a vitreous silica basin heated directly on a hot plate at 480 °C until self-ignition occurred. After combustion, the powder was calcined at 700 °C for 2 h. The formation of the spinel phase and the distribution of cations in the tetrahedral and octahedral sites of the crystal structure were investigated by the Rietveld method, using synchrotron X-ray diffraction data and Mössbauer spectroscopy. The material presented a crystallite size of 120 nm and magnetic properties. The resulting stoichiometry after the Rietveld refinement was (Fe0.989(2) Ni0.011(2)) [Fe1.012(2) Ni0.989(2)] O4.
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Acknowledgements
The authors thank RENAMI, CNPq and FAPESP (Brazil) for their financial support of this work, and the National Laboratory of Synchrotron Light (LNLS), Campinas, Brazil for the XRD measurements.
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Ramalho, M.A.F., Gama, L., Antonio, S.G. et al. X-Ray diffraction and mössbauer spectra of nickel ferrite prepared by combustion reaction. J Mater Sci 42, 3603–3606 (2007). https://doi.org/10.1007/s10853-006-0383-2
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DOI: https://doi.org/10.1007/s10853-006-0383-2