Abstract Leed-free ferroelectric (1- x )(0.65Bi 0.5 Na 0.5 TiO 3 −0.35Bi 0.1 Sr 0.85 TiO 3 )- x KNbO 3 (BNBST- x KN) ceramics were prepared by the conventional solid state sintering method. The dielectric, ferroelectric and energy-storage properties were systematically investigated. Temperature dependent permittivity curves showed the relaxation properties of BNBST ceramics enhanced with the increase of KNbO 3 . BNBST-15KN exhibited a high permittivity of 3484 and low dielectric loss of 0.003 at 150 °C. Furthermore, Δ e / e 150 °C varied no more than 10% within the tmperature range of 30–297 °C, indicating an excellent dielectric temperature stability. The introduction of KNbO 3 gave rise to a large P m while P-E loops kept slim in shape. Therefore, the optimum energy-storage performance was realized in BNBST-15KN with an energy-storage density W rec of 1.32 J/cm 3 and energy-storage efficiency η of 82.5% at 95 kV/cm, accompanied with superior temperature stability and fatigue performance. The results demonstrated that BNBST- x KN system was a promising lead-free candidate for energy-storage applications.

中文翻译：

---

(1- x )(0.65Bi 0.5 Na 0.5 TiO 3 -0.35Bi 0.1 Sr 0.85 TiO 3 )- x KNbO 3 陶瓷的增强储能性能和介电温度稳定性

摘要 采用常规固相烧结法制备了无铅铁电(1- x )(0.65Bi 0.5 Na 0.5 TiO 3 -0.35Bi 0.1 Sr 0.85 TiO 3 )- x KNbO 3 (BNBST- x KN)陶瓷。系统地研究了介电、铁电和储能特性。随温度变化的介电常数曲线表明，BNBST 陶瓷的弛豫性能随着 KNbO 3 的增加而增强。BNBST-15KN 在 150 °C 下表现出 3484 的高介电常数和 0.003 的低介电损耗。此外，Δ e / e 150 °C 在 30–297 °C 的温度范围内变化不超过 10%，表明具有出色的介电温度稳定性。KNbO 3 的引入产生了较大的 P m 而 PE 环保持纤细的形状。所以，BNBST-15KN实现了最佳储能性能，储能密度W rec 为1.32 J/cm 3 ，储能效率η为82.5%（95 kV/cm），并具有优异的温度稳定性和疲劳性能。结果表明，BNBST-x KN 系统是一种很有前途的无铅储能应用候选者。