Synthesis, Structural, Electrical and Magnetic Characterization of Mn_(0.5)Mg_(0.5-x)Ni_xFe_2O_4 Spinel Nanoferrites

摘要

Nanoferrites of composition Mn_(0.50)Mg_(0.5-x)-Ni_xFe_2O_4 with 0.00 ≤ x ≤ 0.50 were prepared by the chemical coprecipitation method. The prepared nanoferrites were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), atomic force microscopy(AFM), dc electric resistivity and magnetic properties using vibrating sample magnetometer (VSM) to study the structural, morphological, electrical, and magnetic changes taking place with varying Ni and Mg concentration in the composition of the prepared nanoferrites. The XRD results indicated the formation of single spinel ferrite with crystalline size in the range of 16-24 nm. The lattice parameter (a) decreased with the decrease of the Mg concentration. IR reveals the presence of both high and low frequency bands due to tetrahedral and octahedral sites, respectively. Further information about the morphology of the nanoferrites was obtained from AFM and SEM measurements. Electrical properties indicate that synthesized samples have high resistivity. The magnetic hysteresis curves clearly indicate the soft nature of the prepared nanoferrites. Various magnetic parameters such as saturation magnetization (M_s), and remanence (M_r) are obtained from the hysteresis loops and observed to be dependent on the composition.