Preparation and microwave properties of Y-type magnetoplumbite microcrystalline glass ceramic with the composition 0.5(Ba2ZnZCo2-ZFe12O22)·0.5SiO2

The citrate sol-gel synthesis technique was used to prepared Ba₂Zn_ZCo_2-ZFe₁₂O₂₂/SiO₂ microcrystalline glass ceramic with Z=2.0, 1.6, 1.2, and 0.8. Several methods such as X-ray diffractometry, scanning electron microscopy and HP vector network analyzer were used to obtain detailed information on the crystallography and magnetic properties of Ba₂Zn_ZCo_2-ZFe₁₂O₂₂/SiO₂ microcrystalline glass ceramic. The correlation of the formation of Ba₂Zn_ZCo_2-ZFe₁₂O₂₂/SiO₂ microcrystalline glass ceramic with thermal treatment was studied. The complex dielectric constant and complex permeability of microcrystalline glass ceramic-paraffin wax composites were measured by the transmission/reflection coaxial line method in the range from 100MHz to 6 GHz. The effects of composition, annealing temperature and measuring frequency on complex permittivity and permeability of Ba₂Zn_ZCo_2-ZFe₁₂O₂₂/SiO₂ microcrystalline glass ceramic were also investigated. Received 23 July 2001 / Accepted: 24 July 2001