Dependence of Phase Structure and Discharge Performance on the Temperature of Perovskite Composited Ceramics

0.8Sr 0.875 Pb 0.125 TiO 3 –0.2Bi(Mg 0.5 Zr 0.5 )O 3 – x (K 0.5 Na 0.5 )NbO 3 (0.8SPT–0.2BMZ– x KNN, 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 ( η ) are 1.27 J cm −3 and 90% at 240 kV cm −1 , respectively. Moreover, W rec and η 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 ≈2.05 J cm −3 and a large power density of ≈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.