Effects of Ce–Co substitution on the magnetic properties of M-type barium hexaferrites

M-type barium hexaferrites Ba1−xCexFe12−xCoxO19 (0.0≤x≤0.30.0≤x≤0.3) have been synthesized by a simple chemical coprecipitation method. X-ray diffraction (XRD) studies indicate that the samples are of single phase, with space group P63/mmcP63/mmc. The results of field-emission scanning electronic microscopy (FE-SEM) show that the grains are regular hexagonal platelets with sizes from 0.5 to 1.5μm. It is observed that the value of the coercivity field (HcHc) increases at low substitution (x≤0.1x≤0.1), reaches a maximum at x=0.1x=0.1, and then decreases at x≥0.1x≥0.1, while the value of saturation magnetization (MsMs) decreases monotonically with increasing xx. The variations of magnetic properties can be tentatively attributed to the effects of Ce–Co substitution. The results above indicate that our samples might be promising candidates for permanent magnets and perpendicular recording media materials in the future.

► The grains of BCFCO ferrites are regular hexagonal platelets with sizes between 0.5 and 1.5μm. ►TCTC shifts to lower temperature with increasing Ce–Co substitution level. ► Samples exhibit decreased saturation magnetization (MsMs) values with increasing xx. ►HcHc increases at x≤0.1x≤0.1, and then decreases at x≥0.1x≥0.1.