Synthesis, structural, magnetic and dielectric characterizations of molybdenum doped calcium strontium M-type hexaferrites

Molybdenum doped strontium calcium hexagonal ferrites have been synthesized by the sol gel combustion method. The structural and morphological characterizations of the prepared hexaferrites were carried out by X-ray diffraction and scanning electron microscopy, respectively. Magnetic and dielectric properties of these compounds were also studied. X-ray diffraction analysis revealed that all the synthesized samples have single magnetoplumbite phase with average particle size in the range 34–47 nm. The remanent magnetization falls with the concentration of dopant cation in the studied range of magnetic field. The coericivity of all the samples is increased with Mo concentration and is high enough to be used for longitudinal magnetic recording media. The dielectric parameters exhibit the relaxation behavior in higher frequency region and show increasing trend with the molybdenum contents. The high magnitudes of dielectric constant of the synthesized hexaferrites make them suitable materials for miniaturization of microwave devices.