Influence of Iron Content on Microstructure and Magnetic Properties of Sr0.3La0.4Ca0.3 n(Fe2O3)Co0.4

In this work, the hexagonal ferrite Sr0.3La0.4Ca0.3 n (Fe2O3)Co-0.4, where n ranging from 5.5 to 6.0 with a step of 0.1, and magnetic powders and magnets were synthesized by solid-states reaction. The microstructure of the magnetic powders was investigated by X-ray diffraction (XRD). And then we can found that a single magnetoplumbite phase is obtained for magnetic powders as a result when 5.6 n 5.8. When the iron content in the magnetic powders increased continuously, the diffraction peaks of alpha-Fe2O3 were observed. Scanning electron microcopy (SEM) was used to explore the micrographs of the magnets and the hexagonal-shaped crystals were found obviously. The magnetic properties of the M-type hexagonal ferrites Sr0.3La0.4Ca0.3 n(Fe2O3)Co-0.4 were studied by using vibrating sample magnetometry. The saturation magnetization (M (s)) first increased and then began to decrease with the n increasing. While the coercivity first decreased with the n from 5.5 to 5.9 and then increased when n 5.9. The coercivity (H (c)) of the hexagonal ferrite Sr0.3La0.4Ca0.3 n(Fe2O3)Co-0.4 reaches the maximum value (H (c) = 1130 Oe) when the iron content (n = 5.5).