The effect of annealing on the structural and magnetic properties of zinc substitutes Ni-ferrite nanocrystals
Nanosized Ni0.5Zn0.5Fe2O4 was prepared by chemical co-precipitation technique using the chlorides of Ni, Zn and Fe (III) and oleic acid. The precursors were annealed at different temperature 500, 700, and 900 °C. The XRD of samples show the presence of single phase cubic spinel structure. Grain size of the sample has been determined using Scherrer formula and SEM technique. The particle size, Lattice parameter and X-ray density were estimated from X-ray diffraction data. The particles size is found to vary from 13nm to 31 nm and largely depends on the annealing temperature. Magnetization measurements have been carried on the nano-size Ni-Zn ferrite and it was found that saturation magnetization (Ms), Remanance (Mr) and coercivity were lower compared to bulk materials.