A layered perovskite structure K_0.5Na_0.5NbO₃Bi_4−xPr_xTi₃O₁₂ lead-free relaxation ferroelectric capacitor was fabricated by inserting piezoelectric K_0.5Na_0.5NbO₃ unit into Bi₄Ti₃O₁₂ matrix. Pr element doping induced lattice distortion assists the matching between inserting unit and matrix. K_0.5Na_0.5NbO₃Bi_2.6Pr_1.4TiO₁₂ capacitor has aroused the large energy storage density (U_re) 69.7 J/cm³ and high efficiency (η) 78.13% at room temperature. The well performances can be captured by the randomly dispersed polar nano-regions. The inserted piezoelectric unit hosts regulate the long-range ferroelectric order, which leads to the disturbed ferroelectric order by Pr³⁺ doping and further forms the polar nano-regions. Raman spectra evolution is well documented to the polar nano-regions. What’s more, the energy capacitors exhibit excellent thermal stability in a temperature range of −20 ℃–140 ℃ and fatigue stability with charge/discharge cycling reaching 1 × 10⁸. Inserting piezoelectric unit provides a strategy to design dielectric energy capacitors.

通过将压电体K _0.5 Na _0.5 NbO ₃单元插入Bi ₄ Ti ₃ O ₁₂基质中，制成层状钙钛矿结构K _0.5 Na _0.5 NbO ₃ Bi _{4 -x} Pr _x Ti ₃ O ₁₂无铅弛豫铁电电容器。Pr元素掺杂引起的晶格畸变有助于插入单元与矩阵之间的匹配。K _0.5 Na _0.5 NbO ₃ Bi _2.6 Pr _1.4 TiO ₁₂该电容器在室温下引起了大的储能密度（U _re）69.7 J / cm ³和高效率（η）78.13％。井的性能可以被随机分散的极性纳米区域捕获。插入的压电单元主体调节长距离铁电有序，这会由于Pr ³⁺掺杂而导致铁电有序受扰，并进一步形成极性纳米区域。拉曼光谱的演变在极地纳米区域有很好的记录。此外，能量电容器在-20℃至140℃的温度范围内具有出色的热稳定性，并且在充放电循环达到1×10 ^8时具有疲劳稳定性。。插入压电单元为设计介电电容器提供了一种策略。