Inspired by increasing demand of advanced pulsed power capacitors, the development of lead-free dielectric ceramic capacitors with high energy storage density and temperature-insensitive performance are extremely crucial. Herein, the lead-free relaxor ferroelectric ceramics based on (1-x) (Na_0.5Bi_0.5)_0.6Sr_0.4TiO₃- xSr_0.7La_0.2ZrO₃ [abbreviated as (1-x)NBST-xSLZ] are prepared by the solid-state reaction route. The large recoverable energy density (W_rec) of 3.45 J/cm³ and efficiency (η) of 90.1% are simultaneously realized in 0.86NBST-0.14SLZ ceramic due to increased breakdown strength. Furthermore, both the W_rec and η of 0.86NBST-0.14SLZ ceramic display superior of thermal stability (20–180 °C), frequency stability (1–1000 Hz), and cycle stability (10⁴) within a satisfactory range of variation. In addition, the 0.86NBST-0.14SLZ ceramic can also achieve a large current density (C_D) of 625 A/cm², an ultrahigh power density (P_D) of 50 MW/cm³ and a fast discharge rate (τ_0.90) of 160.8 ns at 160 kV/cm. These results demonstrate that the 0.86NBST-0.14SLZ ceramic could be a highly competitive and eco-friendly relaxor ferroelectric material for next-generation pulsed power capacitors.

受高级脉冲功率电容器需求增长的启发，开发具有高能量存储密度和对温度不敏感的性能的无铅介电陶瓷电容器至关重要。在本文中，无铅弛豫铁电陶瓷基于（1- X）（钠_0.5的Bi _0.5）_0.6锶_0.4的TiO ₃ - X锶_0.7的La _0.2的ZrO ₃ [简称为（1- X）NBST- X SLZ]制备的通过固态反应路线。3.45 J / cm ³的大可回收能量密度（W _rec）由于击穿强度的提高，在0.86NBST-0.14SLZ陶瓷中同时实现了90.1％的效率（η）。此外，0.86NBST-0.14SLZ陶瓷的W _rec和η在令人满意的变化范围内均表现出优异的热稳定性（20–180°C），频率稳定性（1–1000 Hz）和循环稳定性（10 ⁴）。 。此外，0.86NBST-0.14SLZ陶瓷罐还实现大的电流密度（ç _d 625 A /厘米的）²，超高压的功率密度（P _d的50毫瓦/平方厘米）³和快速放电率（τ _0.90在160 kV / cm时为160.8 ns）。这些结果表明，0.86NBST-0.14SLZ陶瓷可以成为下一代脉冲功率电容器的极具竞争力和环保的弛豫铁电材料。