Co-precipitation

Nanocrystalline strontium hexaferrite (SrFe12O19) powders have been successfully synthesized using facile Co-precipitation method. Ferrite precursors were obtained from mixtures of strontium and ferric chloride in an aqueous medium without any surfactant and soft template. The as-received powders were calcined at 800 and 1000 ˚C for 2 hours in air. The final powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area analysis and Vibrating Sample Magnetometer (VSM). The effects of calcination temperature on phase composition, particle size and shape as well as magnetic properties of the products have been investigated. The results indicated that higher calcination temperature (1000 oC) resulted in higher particle sizes (98.1 nm), maximum saturation magnetization (60.53 emu/g), remanence value (36.23 emu/g) and less surface area (12 m2g-1). The magnetocrystalline anisotropy constant, K, calculated from the Stoner–Wohlfarth theory, increases by increasing temperature up to 15.1 (HA2/kg). 1