CONVENIENT SYNTHESIS OF NI-ZN FERRITES FROM METAL CHLORIDES

Due to unique magnetic, electrical and optical properties nanocrystalline materials are getting more technological importance day by day. in recent years, ni-zn ferrite nano composites have gained much interest due to applications in magnetic resonance imaging, high density magnetic recording and ferrofluids technology. ni-zn ferrite nanoparticles were made by chemical co-precipitation technique. aqueous solutions of metal chlorides were coprecipitated with sodium hydroxide (naoh) by using different concentrations of ni and zn. the naoh solution was added very slowly to attain 12 ph value and the dark brown precipitates. these precipitates were kept in a pre-heated water bath at 85 ºc forabout 90 min. the precipitates were washed several times till neutralp h. and dried at 75ºc for 4h. the dried samples were ground to fine powder and calcined at 700ºc for 2h. x-ray diffraction (xrd) technique was applied to characterize the nanoparticles. the determination of the particle size was doneusing scherrer's formula which ranged from 22.67 to 26.29 nm. the coprecipitation method proved to be economical and convenient way to prepare ni-zn ferrite nano particles.