Complex permittivity, permeability, and microwave absorption of Zn- and Ti-substituted barium ferrite by citrate sol–gel process

Ba(ZnTi)xFe12−2xO19 (x varies from 0.2 to 1.0 in steps of 0.2) hexaferrites were prepared by citrate sol–gel process, the formation temperature is about 800 °C. The samples were characterized by XRD, scanning electron microscopy. The effect of Zn2+Ti4+ substitution, annealing temperature on complex permeability, permittivity and microwave absorption had been studied for Ba(ZnTi)xFe12−2xO19 ferrite in the frequency range from 100 MHz to 6.0 GHz. All the ferrites exhibit significant dispersion in complex permeability. The dispersion in complex dielectric constant is not significant. The variations of reflection loss have been studied as a function of frequency, Zn2+Ti4+ content, and thickness of the absorber.