Abstract
The structural and magnetic properties of manganese substituted nickel ferrite nanoparticles were synthesized by auto-combustion and evaporation methods. The effects of annealing treatment on structural and magnetic behavior of the samples have been studied for 600°C and 900°C. The ferrite powders were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). The X-ray diffraction patterns indicated that the annealed samples resulted in the formation of Mn–Ni ferrite and the presence of α-Fe2O3 as a secondary phase. The average crystallite sizes of the annealed samples are in the range from ~25 to 65nm for auto combustion method and ~45 to 98nm for evaporation method. The morphology and particle size of the annealed samples are examined by SEM and TEM. The annealing effect on the magnetic properties of Mn–Ni ferrites were analyzed by using a Vibrating Sample Magnetometer (VSM). The impact of particle size, the saturation magnetization of Mn–Ni ferrite nanoparticles increase with increasing annealing temperature.
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