Synthesis, microstructure and magnetic properties of Ni-Mg ferrites
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The effect of compositional variation on the structure and magnetic properties of Ni-Mg ferrites with compositions Ni1-xMgxFe2O4 for [x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0], prepared by a conventional double sintering ceramic technique, sintered at 1350 ο C for 4.5 hours were investigated. The structural characterization of the samples has been performed by X-ray diffraction (XRD). X-ray diffraction results confirmed the single-phase spinel structures of all the ferrite samples. The lattice parameters have been found to increase linearly with increasing Mg concentration, obeying Vegard’s law. The bulk density and X-ray density of the samples decrease monotonically with increasing Mg content. SEM micrographs exhibit a decrease in grain size with increasing Mg content. The Curie temperature of Ni-Mg ferrites was found to decrease with an increase in the Mg2+ content due to the reduction of A-B exchange interactions. The complex initial permeability is found to decrease as the Mg content increases which is consistent with the variation of density with Mg ions.
Abstract
The effect of compositional variation on the structure and magnetic properties of Ni-Mg ferrites with compositions Ni1-xMgxFe2O4 for [x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0], prepared by a conventional double sintering ceramic technique, sintered at 1350 ο C for 4.5 hours were investigated. The structural characterization of the samples has been performed by X-ray diffraction (XRD). X-ray diffraction results confirmed the single-phase spinel structures of all the ferrite samples. The lattice parameters have been found to increase linearly with increasing Mg concentration, obeying Vegard’s law. The bulk density and X-ray density of the samples decrease monotonically with increasing Mg content. SEM micrographs exhibit a decrease in grain size with increasing Mg content. The Curie temperature of Ni-Mg ferrites was found to decrease with an increase in the Mg2+ content due to the reduction of A-B exchange interactions. The complex initial permeability is found to decrease as the Mg content increases which is consistent with the variation of density with Mg ions.
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