Composition and magnetic properties of M-Ba ferrite powders fabricated via sugar-nitrates process

Fine M-type hexagonal barium ferrite (M-Ba ferrite) powders were synthesized by a novel sugarbased process. The effects of synthesis variables such as the molar ratio of Fe/Ba, the calcination temperature and the pH value of the precursor solution on the phase component of the obtained powder and the magnetic properties of M-Ba ferrite were studied by the thermogravimetric analysis, differential thermal analysis, X-ray diffraction, scanning electron microscopy and a physical properties measurement system. The results of this study showed that magnetic properties and formation of M-Ba ferrite were significantly influenced by the Fe/Ba molar ratio, the heat treatment temperature and pH of the precursor solution. Single phase M-Ba ferrite powders with the specific saturation magnetization of 63.6 emu/g and the coercivity of 1849 Oe could be obtained when the Fe/Ba molar ratio was 11.5 and the pH value of precursor solution was 6.5.