Effect of different weight fraction on dielectric properties of barium ferrite-barium titanate composites

Abstract

Barium ferrite-barium titanate composite systems, (1-x)BaFe 12O19 - (x)BaTiO3 with different weight fractions of × = 0.0, 0.1, 0.3 and 0.5 were prepared via the conventional solid state reaction method using nano-sized starting materials. The x-ray diffraction peaks of the composite samples show two phases which can be indexed by the hexagonal barium ferrite and tetragonal barium titanate. Field emission scanning electron microscope (FESEM) image of sample with × = 0.1 shows formation of nano-sized BaTiO3 grains spreading evenly among the micron-sized BaFe12O19 grains after sintering at 1000°C. The dielectric properties studies at room temperature of the composites samples show that sample with BaTiO3 weight fraction of × = 0.1 has the highest dielectric constant, ε′ and lowest loss tangent, tan δ in the studied frequency range between 1 Hz and 1 MHz. Its highest dielectric constant value is ∼ 1.2 × 103 and its lowest loss tangent is 0.06 at 50 Hz.