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Bi and Li co-doping BaZr0.15Ti0.85O3 ceramics were fabricated by the solid-state method, and investigated the impact on the microstructural, dielectric, ferroelectric and energy storage properties. XRD results show that the structure is perovskite and there is no secondary phase in all samples. SEM pictures indicate that the average grain size significantly decreases as the doping concentration increase. In addition, the phase transition peak is broadened and the Curie temperature shifts towards lower temperature. This phenomenon provides a significant possibility for the application to room temperature, and diffuse phase transition occurs. Moreover, P–E hysteresis loops of all samples demonstrate that remnant polarization and saturated polarization diminish as the doping concentration increases. A high energy storage density of 1.23 J/cm3 is obtained in the doped sample, and the energy storage efficiency is also significantly enhanced compared with the undoped sample. [ABSTRACT FROM AUTHOR]

Energy storage ceramics are important materials used in dielectric energy storage capacitors, which have a large dielectric constant, low dielectric loss, and good temperature stability. It has a promising application in high temperature-resistant dielectric pulse power systems. This study uses the sol–gel method to prepare Ba0.85Ca0.15Zr0.1Ti0.9O3 (abbreviated as BCZT) precursor powder, and then uses the solid phase method to prepare Ba0.85Ca0.15Zr0.1Ti0.9O3-8%BiFe1-x(Mg0.5Ti0.5)xO3 (abbreviated as BCZT-BFMT, x = 0, 15, 50 and 100%). The effects of different doping amounts of Mg ions and Ti ions on the energy storage performance of BCZT-BFMT ceramics were systematically investigated. The results show that all samples with different compositions show pure phase and dense microstructures, and the sample with x = 50% has better dielectric properties. When the doping content is 50%, the energy storage density of the sample is 0.73 J/cm3 under the breakdown electric field of 108 kV/cm, which is significantly improved compared with the pure BCZT-BF sample. [ABSTRACT FROM AUTHOR]