Enhanced dielectric relaxation in (1−x)BaTiO3–xBiYO3 ceramics

•(1−x)BaTiO3–xBiYO3 ((1−x)BT–xBY) (x=0.00–0.30) ceramics were prepared by the solid-state reaction technique. All the samples were sintered at 1300 °C for 2 h in air.•The effects of BiYO3 content on the phase composition were studied.•The effects of BiYO3 content on the microstructure were studied.•The effects of BiYO3 content on the dielectric properties were studied.•The effects of BiYO3 content relaxor behavior, dielectric temperature stability were studied.

The polycrystalline (1−x)BaTiO3–xBiYO3 ((1−x)BT–xBY) (x=0.00–0.30) ceramics were fabricated via a conventional solid state route. The phase transition, microstructure and dielectric performances of the composites were investigated. X-ray powder diffraction patterns indicates tetragonal symmetry at x≤0.04, whilst the XRD patterns for x>0.04 are pseudocubic. A progressive decline in εrmax with the elevation of x leads to near temperature-stable dielectric properties over a wide temperature range. For x≥0.04, dielectric measurements indicates relaxor behavior. Dielectric temperature stability of BT ceramics have improved effectively by the increasing amount of BY content. It is found that x=0.30 can meet the X9R criterion, with Δε/Δε25≤±15% in the temperature range of −55 to 200 °C .