The preparation and microwave properties of Ba3ZnZCo2−ZFe24O41 ferrite by citrate sol–gel process

A series of Ba3ZnZCo2−ZFe24O41 ferrite with Z=0.0, 0.4, 0.8, 1.2, 1.6 and 2.0 had been prepared by citrate sol–gel process, the result showed that the pure Z-type hexaferrite could be obtained by this process at 1200°C for 5 h. The complex dielectric constant and complex permeability were measured in 100 MHz–6 GHz by using transmission/reflection coaxial line method. It showed that the real part of the dielectric constant was almost invariable in the whole measuring frequency for all samples, the imaginary part of the dielectric constant and the real part of the permeability all decreased with the measuring frequency. And nature resonance phenomena were observed in the μ″ spectra for all samples. It also indicated that substitution of zinc ions had a close effect on the nature resonance frequency of Ba3ZnZCo2−ZFe24O41 ferrite, the more the zinc ions was, the lower the resonance frequency.