Microwave absorption properties of Mn- and Ti-doped strontium hexaferrite

M-type strontium hexaferrite SrFe9Mn1.5Ti1.5O19 was synthesized by solid-state method. X-ray diffraction (XRD), scanning electron microscopic (SEM), energy dispersive spectrometer (EDS) and susceptometer were used for characterization of obtained powders. The ferrite–polymer composites with different ferrite ratios of 50%, 60%, 70% and 80% in polyvinylchloride matrix were prepared. The microwave absorption properties of these composites were investigated in 12–20 GHz frequency range. The results showed that the particle size had a wide range of distribution and the magnetoplumbite structure was formed in the sample. The composite with 70% ferrite content has shown a maximum reflection loss of −26 dB at 18.84 GHz with the −15 dB bandwidth over the extended frequency range of 16.4–19.4 GHz for an absorber thickness of 1.8 mm. It was concluded that the prepared composites could be good candidates for electromagnetic compatibility and other practical applications at high frequency.