Preparation and characterization of Ni‐Ferrite Nano Particles

Mixed ferrite system of com position Nix Fe3−x O4 Where (x= 1,1.25,1.5,2) (inverse spinel) has been prepared in nano form. Ni and Fe nitrates are mixed and shacked thoughrly, then NaOH has been used as a precipitating agent. Obtained samples were washed by the ionized water and ethanol. Finally dried at 70°C for one day the ingots have been annealed at different temperatures. XRD and ME spectra have been measured. It was found that the particle size increases by increasing annealing temperature. All samples annealed at T ⩽ 650°C show superparamagnetic effects. Samples annealed at 900,1000°C exhibit magnetic hyperfine interaction reflecting high magnetic moments.