Room temperature optical and dielectric properties of Ca and Ni doped Barium Ferrite

The citrate sol gel combustion method has been used to synthesize (Ba0.9Ca0.1) (Fe0.8Ni0.2)(12)O-19 hexaferrites. Microstructural analyses were carried out by XRD and FTIR. Optical properties were studied by UV-visible technique in the range of 300-800 nm. The energy band gap was calculated with the help of Tauc relationship shows increases in band gap. Ca and Ni doped barium ferrite annealed at 850 degrees C exhibit significant dispersion in complex permeability. The dispersion in complex dielectric constant can be explained on the basis of Koop's theory based on Maxwell-Wagner two layer models in studied nanoparticles.