Effect of interface layer on dielectric and magnetic properties of 2–2 type Ba2Ti9O20–BaFe12O19 composite ceramics

2–2 type Ba2Ti9O20–BaFe12O19 composite ceramics were prepared by a tape casting method. Interface, dielectric and magnetic properties of prepared composite ceramics have been reported. Obvious interface diffusion between the dielectric and the ferrite has been observed by scanning electron microscopy and energy dispersive spectrometer. It was observed that the thickness of interface increased with increasing of sintering temperature. Compared with pure Ba2Ti9O20 ceramic, relatively high dielectric constant and loss of the prepared composite have been obtained. Meanwhile, lower saturation and remnant magnetizations, and higher coercive field than that of pure BaFe12O19 ferrite has also been obtained. The dielectric constant of the prepared composites increased and then decreased, with increasing of sintering temperature accompanied with an opposite variation for the dielectric loss. At the same time, the saturation magnetization, the remnant magnetization and the coercive field decreased.