Dielectric capacitors are widely concerned because of high-power density. It is essential to develop lead-free materials with high recoverable energy density (W_rec). Herein, the Ag_1–3xEu_xNbO₃ (AENx) ceramics with x = 0, 0.01, 0.02, and 0.04 were synthesized via a traditional solid-state reaction method. The effects of Eu³⁺ additions on the phase, microstructure, and energy-storage performance of AgNbO₃ (AN) antiferroelectric ceramics were systematically studied. The results show that a few Eu doping do not change the perovskite structure of AN, but reduce the phase-transition temperatures of the monoclinic M1-M2 and M2-M3 phases, as well as the tolerance factor and the grain size. These, in turn, lead to the improved antiferroelectric phase stability and enhanced breakdown strength. Consequently, a large W_rec of 3.32 J/cm³ and an energy storage efficiency (η) of 40% were obtained in Ag_0.97Eu_0.01NbO₃ ceramic at an applied electric field of 220 kV/cm, which exhibited satisfactory thermal stability at 30–130 °C. Furthermore, the Eu³⁺ doped ceramics exhibit an excellent practical charging/discharging efficiency (< 60 ns). This work shows that the energy storage performance of AN-based ceramics was significantly optimized by Eu doping, making them competitive candidate materials for pulsed power systems.

介质电容器因功率密度高而受到广泛关注。开发具有高可恢复能量密度（ W _rec ）的无铅材料至关重要。本文通过传统的固相反应方法合成了x  =0、0.01、0.02和0.04的Ag _{1–3 x} Eu _x NbO ₃ (AEN x )陶瓷。^{Eu 3+添加对AgNbO} ₃物相、微观结构和储能性能的影响(AN)系统地研究了反铁电陶瓷。结果表明，少量Eu掺杂并没有改变AN的钙钛矿结构，但降低了单斜晶M1-M2和M2-M3相的相变温度，以及容差因子和晶粒尺寸。这些反过来又导致反铁电相稳定性的提高和击穿强度的增强。_{因此，Ag 0.97} Eu _0.01 NbO ₃陶瓷在220 kV/cm的外加电场下获得了3.32 J/cm ³的大W _rec和40%的储能效率（η ），并且在220 kV/cm的外加电场下表现出令人满意的热稳定性。 30–130°C。此外，欧盟³⁺掺杂陶瓷表现出优异的实用充电/放电效率（< 60 ns）。这项工作表明，Eu 掺杂显着优化了 AN 基陶瓷的储能性能，使其成为脉冲功率系统的有竞争力的候选材料。