Abstract
Enhancement of magnetic moment as well as magneto-crystalline anisotropy constants is essential for the device application of magnesium ferrites. We were able to achieve enhanced magnetic properties of nanocrystalline magnesium ferrite by virtue of suitable doping. The investigated samples, with the general formula Mg0.7Me0.3Fe2O4 (where Me = Ca and Co), were prepared by a citrate method. These compositions were then subjected to a detailed study for structural and magnetic properties. X-ray diffraction (XRD) studies confirmed the formation of cubic spinel phase (space group Oh7-F3dm). Energydispersive X-ray (EDX) results showed that the composition of the elements was as relevant as expected from the citrate method. The obtained nanoferrites showed a particle size within the range of 14–21 nm. In the case of Mg0.7Ca0.3Fe2O4, the reaction is fast and more exothermic, initiating the decreases in the molecular concentration at the crystal surface and hence obstructing the grain growth. The magnetic hysteresis measurement was performed using a vibrating sample magnetometer. Magnetic parameters such as effective magnetic moment, Curie temperature, saturation magnetization, remanent magnetization, and coercivity were obtained. Based on UV diffuse reflectance spectroscopy studies, the optical band gaps were found to range from 1.1 to 2.05 eV.
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