Structural and magnetic properties of nanocrystalline BaFe12O19 synthesized by microwave-hydrothermal method

摘要

Nanocrystalline BaFe₁₂O₁₉ powders were prepared by microwave-hydrothermal method at 200?°C/45?min. The as-synthesized powders were characterized by using X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA). The present powders were densified at different temperatures, i.e., 750, 850, 900 and 950?°C for 1?h using microwave sintering method. The phase formation and morphology studies were carried out using XRD and field emission scanning electron microscopy (FE-SEM). The average grain sizes of the sintered samples were found to be in the range of 185–490?nm. The magnetic properties such as saturation magnetization and coercive field of sintered samples were calculated based on magnetization curves. A possible relation between the magnetic hysteresis curves and the microstructure of the sintered samples was investigated.