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

M-type barium hexaferrites Ba1−xCexFe12−xCoxO19 ( 0.0 ≤ x ≤ 0.3 ) 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 P 6 3 / m m c . The results of field-emission scanning electronic microscopy (FE-SEM) show that the grains are regular hexagonal platelets with sizes from 0.5 to 1.5 μ m . It is observed that the value of the coercivity field ( H c ) increases at low substitution ( x ≤ 0.1 ), reaches a maximum at x = 0.1 , and then decreases at x ≥ 0.1 , while the value of saturation magnetization ( M s ) decreases monotonically with increasing x . 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.