X-Ray diffraction and mössbauer spectra of nickel ferrite prepared by combustion reaction
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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.
KeywordsFerrite Octahedral Site NiFe2O4 Rietveld Refinement Combustion Reaction
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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