y mol% Fe-doped Ba(Zr_0.2Ti_0.8)O₃—x mol%(Ba_0.7Ca_0.3)TiO₃ (abbreviated as yFe:BCZTx) ferroelectric ceramics with y = 0, 0.375, 0.75, and 1.5 across the morphotropic phase boundary (MPB) with x = 44 and 56 were fabricated via conventional solid state reaction methods. Fe incorporated into the lattice and all the yFe:BCZTx ceramics showed pure perovskite structure. Fe-doping can significantly reduce the grain sizes and shift the tetragonal-cubic phase boundary toward lower temperature for all the investigated compositions across the MPB. A moderate enhancement of frequency dispersion on the dielectric constant was observed. The temperature dependent dielectric constant was analyzed according to modified Curie–Weiss law and the diffuse factor increased with increasing Fe-doping content. Relaxor-like slim polarization–electric field (P-E) loops were obtained for all BCZTx ceramics after Fe-doping. 1.5Fe:BCZTx ceramics shows almost hysteresis free P-E loops without obvious fatigue behavior after 10,000 cycles. The recoverable energy storage efficiency was significantly enhanced in 1.5Fe:BCZTx ceramics with good temperature stability. Our results indicate Fe-doping can be used as a universal phase boundary shifter and to increase energy storage efficiency for BCZT ceramics.

y mol% Fe 掺杂 Ba(Zr _0.2 Ti _0.8 )O ₃ — x mol%(Ba _0.7 Ca _0.3 )TiO ₃（缩写为y Fe:BCZT x）铁电陶瓷，y  = 0、0.375、0.75和 1.5 x  = 44 和 56的同形相界 (MPB)是通过传统的固态反应方法制造的。Fe 并入晶格和所有y Fe:BCZT x陶瓷显示出纯钙钛矿结构。对于整个 MPB 上的所有研究成分，Fe 掺杂可以显着减小晶粒尺寸并使四方-立方相界向较低温度移动。观察到介电常数的频率色散适度增强。根据修正的居里-魏斯定律分析温度相关的介电常数，扩散因子随着 Fe 掺杂量的增加而增加。在掺杂 Fe 后，所有 BCZT x陶瓷都获得了类似弛豫的细长极化电场 (PE) 环。1.5Fe:BCZT x陶瓷在 10,000 次循环后显示出几乎无滞后的 PE 回路，没有明显的疲劳行为。1.5Fe:BCZT x可回收储能效率显着提高陶瓷具有良好的温度稳定性。我们的结果表明，Fe 掺杂可用作通用相边界移动器，并提高 BCZT 陶瓷的储能效率。