Barium hexaferrite synthesis by oxalate precursor route

Magnetic materials are important electronic materials that have a wide range of industrial and commercial applications. Barium hexaferrite (BaFe12O19), is of great importance as permanent magnets, particularly for magnetic recording as well as in microwave devices. An aim of this study was to synthesize stoichiometric and single phase barium hexaferrite by a technique of oxalate precursor. Effect of different annealing temperature on the particle size, microstructure and magnetic properties of the resulting barium hexaferrite powders has been studied, and reported in the presented paper. The Fe3+/Ba2+ mole ratio was controlled at 12, while the annealing temperature was controlled from 800 to 1200 °C. The resultant powders were investigated by differential thermal analyzer (DTA), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). Single well crystalline BaFe12O19 phase was obtained at annealing temperature 1200 °C. The SEM results showed that the grains were regular hexagonal platelets. In addition, maximum saturation magnetization (66.36 emu/g) was observed at annealing temperature 1100 °C. However, it was found that the coercivity of the synthesized BaFe12O19 samples was lower than the theoretical values.