The effects of the iron content on structural and magnetic properties of Sr0.80La0.20FexZn0.15O19 hexagonal ferrites

The hexagonal ferrite Sr0.80La0.20FexZn0.15O19 (10.65≤x≤12.05) magnetic powder and magnets were synthesized by the ceramics process. The phase components of the hexagonal ferrite magnetic powder were studied using X-ray diffraction (XRD). Scanning electron microscopy (SEM) was used to investigate the morphology of the sintered magnets. The effects of the iron content on magnetic properties of the magnets were studied systematically. The remanence (Br) and maximum energy product [(BH)max] for the magnets at x=11.25 reached the maximum value of 414.5 mT and 32.24 kJ/m3, respectively. The intrinsic coercivity (Hcj) and magnetic induction coercivity (Hcb) for the magnets at x=11.65 reached the maximum value of 265.8 kA/m and 257.8 kA/m, respectively.