Effect of (Bi, Li) co-doping on dielectric and ferroelectric properties in BaZr${}_{0.15}$Ti${}_{0.85}$O${}_3$ ceramics

Bi and Li co-doping BaZr${}_{0.15}$Ti${}_{0.85}$O${}_3$ 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/cm${}^3$ is obtained in the doped sample, and the energy storage efficiency is also significantly enhanced compared with the undoped sample.