Dielectric capacitors with high energy storage density and high efficiency exhibit potential applications in lightweight, miniaturized microelectronic devices. Here, (Pb, La)(Zr, Sn)O₃ (PLZS) based ceramics with Ba substitution were selected and studied with in-situ Raman spectra and in-situ synchrotron X-ray diffraction. Results show that the room temperature phase structure consists of two coexisting antiferroelectric phases of O_I and O_II (O refers to orthorhombic), and between them the latter possesses lower forward phase-switching electric field (E_AF) and should be the origin of FE(I). Meanwhile, Polarization-electric field (P-E) loops and Raman spectrum under variable temperature reveal optimal Ba content of 0.02. Suitable Ba substitution forms balanced coexisting structure and therefore achieves ultrahigh recoverable energy storage density (W_rec) of 12.8 J/cm³ and simultaneously high energy storage efficiency (η) of 84.2% under an electric field of 450 kV/cm. Extremely short discharge period of 51.6 ns and high W_rec support ultrahigh power density (P_D) of 327 MW/cm³ and high discharge current density (D_dis) of 1815 A/cm². Reasonable phase structure design after clarifying the relationship between structure and performance shows guiding significance, and the improved ultra-high W_rec and P_D enhance the possibility of applications of antiferroelectric ceramics in pulsed power capacitor.

具有高能量存储密度和高效率的介电电容器在轻巧，微型化的微电子器件中显示出潜在的应用。在这里，选择了具有Ba取代的（Pb，La）（Zr，Sn）O ₃（PLZS）基陶瓷，并用原位拉曼光谱和原位同步加速器X射线衍射进行了研究。结果表明，室温相结构由O _I和O _II两个共存的反铁电相组成（O表示正交晶），并且它们之间具有较低的正向相变电场（E _AF）），并且应该是FE（I）的来源。同时，在可变温度下的极化电场（PE）回路和拉曼光谱显示最佳Ba含量为0.02。合适的Ba取代形成平衡的共存结构，因此在450 kV / cm的电场下实现了12.8 J / cm ^3的超高可回收能量存储密度（W _rec）和84.2％的同时高的能量存储效率（η）。51.6 ns的极短放电时间和高W _rec支持327 MW / cm ^3的超高功率密度（P _D）和1815 A / cm ^2的高放电电流密度（D _dis）。合理相结构设计澄清指导意义的结构和性能示出之间的关系后，和改进的超高W¯¯ _REC和P _d增强的在脉冲功率电容器反铁电陶瓷的应用的可能性。