Dielectric Properties of (1- x )BaTiO 3 - x BaFe 12 O 19 Composite Ceramics.

The composite ceramics of (1-x)BaTiO3-xBaFe12O19(x= 0.2, 0.4, 0.5 and 0.6) were prepared by solid state method. The phase formation and diphase microstructure of the composite samples were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that ferroelectric BaTiO3can well coexisted with the magnetic phase BaFe12O19.The electric and dielectric properties of the obtained composites were investigated. The electrical conduction and dielectric constant of the composites increased with the increase of BaFe12O19contents. The high values of conductivity and dielectric constant near 250°C were due to the effect of space charges that played an important role in the composites. (1-x)BaTiO3-xBaFe12O19composites exhibited a high value of dielectric constant at low frequencies and high temperatures. Atx= 0.4, the composites showed usual dielectric dispersion with increasing frequency. [ABSTRACT FROM AUTHOR]