Abstract
M-type ferrites Sr(0.55−x)CaxLa0.45Fe11.65Co0.35O19 (x=0, 0.05, 0.15, 0.25 and 0.35) were prepared by the ceramic process. Phase composition, morphology and sublattice occupation of the material were characterized by X-ray diffraction, scanning electron microscopy and Mössbauer spectroscopy, respectively. Magnetic properties of the materials were tested by a vibrating sample magnetometer. The results show that the samples are all composed of single M-type hexagonal ferrite after the Ca substitution, while the lattice constant c decreases and the lattice constant a does not change basically with increase of the substitution amount. In addition, the intrinsic coercive force increases obviously when the Ca substitution amount x<0.25, while the saturation magnetization does not change after Ca addition, which is attributed to the change of the Fe3+ sublattice occupations suggested by Mössbauer spectroscopy.
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