Ba2Co2-xZnxFe12O22 Hexaferrites produced by the method of self-propagating high-temperature synthesis: Structure, properties, application

Abstract

In this study, Y-type hexaferrites Ba2Co2-xZnxFe12O22 (Co2-xZnx-Y, x = 0.0, 0.5, 1.0, 1.5) powders were synthesized by the method of self-propagating high-temperature synthesis. Hexaferrite powders were obtained both with and without preliminary mechanical activation before synthesis. A comprehensive analysis of the microstructure, morphology, phase composition and magnetic properties has been carried out. The synthesis conditions for obtaining hexaferrite powder with the highest content of the target phase are determined. An increase in the content of the target phase was revealed when using preliminary mechanical activation before synthesis. The magnetocrystalline anisotropy fields and magnetomechanical ratios for Ba2Co2-xZnxFe12O22 powder hexaferrites have been determined for the first time by ferromagnetic resonance method. The study of the spectra of reflection loss and permeability of composites made on the basis of Co2-xZnx-Y hexaferrites synthesized with preliminary mechanical activation showed that these composites can serve as an effective absorber to reduce side electromagnetic radiation in the frequency range of 6–18 GHz.