Dependence of phase structure and discharge performance on the temperature of perovskite composited ceramics

0.8Sr${}_{0.875}$Pb${}_{0.125}$TiO${}_3$-0.2 Bi(Mg${}_{0.5}$Zr${}_{0.5}$)O${}_3$-x(K${}_{0.5}$Na${}_{0.5}$)NbO${}_3$ (0.8SPT-0.2BMZ-xKNN, x = 0.015-0.035) ceramics are calcined by solid-state methods. The phase structures, energy storage, and discharge performance, as well as their temperature stability, are systematically investigated. All samples are verified as a single perovskite structure by X-ray diffraction (XRD) results. The x = 0.03 ceramic possesses excellent temperature stability, meeting the X7R standard for pulsed power capacitors. According to P-E loops calculation, the recoverable energy storage density (W${}_{rec}$) and efficiency ($\eta$) are 1.27 J cm${}^{-3}$ and 90% at 240 kV cm${}^{-1}$, respectively. Moreover, W${}_{rec}$ and $\eta$ also have good temperature insensitivity over a wide temperature range from 30 to 150 °C. The x = 0.03 ceramic has a high discharge energy density of $\approx$2.05 J cm${}^{-3}$ and a large power density of $\approx$143 MW cm${}^{-3}$ at 300 kV cm${}^{-1}$. The excellent temperature insensitivity and large discharge energy density exhibit that the x = 0.03 sample is a potential candidate material for pulsed power capacitors with a wide temperature range. (© 2022 Wiley‐VCH GmbH)