Characterizations of Substituted Co2Y and Zn2Y type Hexagonal Ferrite

Abstract

Hexagonal ferrites are well known for their high-frequency microwave device applications. BaCo2Y and BaZn2Y type hexagonal ferrite are used for microwave antenna as they have good permeability and permittivity at high frequency. To modify the electrical properties of ferrites usually different substitution are applied in their crystal structure. In the present investigation, La-Zn is substituted for Fe in Co2Y ferrite, and La-Co is substituted for Fe in Zn2Y type ferrite. The ferrites with composition Ba2-xLaxZn2Fe12-xCoxO22 and Ba2-xLaxCo2Fe12-xZnxO22 where x equals to 0.0, 0.1, 0.3 and 0.5 were synthesized through conventional solid state reaction route. The phase formation behavior of the ferrites, changes in crystal structure parameters with substitutions were investigated using X-ray diffraction analysis. Accurate lattice parameters were evaluated through Rietveld refinement of XRD pattern. The electrical property of the ferrite was investigated on sintered ferrite. The microstructure of sintered ferrite was investigated by using Field Emission Scanning Electron Microscope (FESEM). The permittivity of the ferrite was measured on sintered pallet and permeability was measured on toroid specimen using LCR meter. All the electrical parameters were co-related with the crystal structure, microstructure, and densification behaviour of the ferrites.