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 .