Structural and Magnetic Properties of Nickel Ferrite Nanoparticles: Effect of Annealing

Nickel ferrite nanoparticles were prepared by co-precipitation method. The prepared powder was annealed at 500°C,700°C, 900°C and 1100°C. The powders were characterized by the X-ray diffraction technique (XRD), FourierTransform Infrared (FTIR), and the magnetic behavior studied by Vibrating Sample Magnetometer (VSM). XRDanalysis showed that nickel ferrite has a spinel structure. Crystallite size calculatedfrom XRD peak broadening resultedin the largest crystallite size of 24 nm. The FT-IR spectra of NiFe2O4showed strong absorption peaks around 600 and400 cm-1 which are typical for the cubic spinel crystal structure. Magnetic measurements showed that magnetizationand coercivity increases when annealing temperature is increased.

کلیدواژه ها:

Nickel ferrite ، co-precipitation ، spinel structure