Abstract
Magnetoplumbite-type (M-type) hexagonal barium ferrite particles were synthesized by a hydrothermal method. The structure and magnetic properties of barium ferrites were investigated systematically, which indicated that the ratio of Fe/Ba (RF/B) and sintering temperature have an important effect on structure and performance. Phase composition, micro-morphology, and magnetic properties of the particles were investigated by X-ray powder diffraction (XRD) analysis, scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM). When the ratio of Fe/Ba (RF/B) is even low or high, inferior images of XRD could be attained with certain impurities. When RF/B = 8, the single phase could be obtained without impurities. Micro-morphology of the particles exhibits the uniform plane hexagonal structures of nano-sized M-type ferrites when sintered at 800 °C. Saturation magnetization (M s) reaches the maximum value at RF/B = 7 (M s = 45.07 emu/g). The value of coercivity (H c) increases with the growth of RF/B, and H c is up to 6207 Oe when RF/B = 7. The effect of RF/B and temperature on magnetization (M s) and coercivity (H c) was studied in this paper.
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