For accepter‐doped perovskite piezoelectric ceramics, macroscopic properties of the materials (eg, hardening, fatigue, and aging) are closely related to microscopic characteristics (eg, oxygen vacancies and defect dipoles). In this work, the relationship of macroscopic and microscopic characteristics in CuO‐doped K_0.5Na_0.5NbO₃ (KNN) ceramic has been studied by subjecting the material to electric field cycling, quenching, heating, and consequently aging. The introduction of CuO in KNN generates and . The defect dipoles exhibit obviously the pinning effect on ferroelectric domains and thus induce a completely pinched/double P‐E loop and excellent hardening piezoelectricity of high Q_m of 2235. With the destruction of short‐range symmetry uniformity between defect dipoles and ferroelectric dipoles induced by electric field cycling, quenching and heating, the ceramic can be depinned and softened. As a result, the depinned ceramic possesses an opened single ferroelectric hysteresis loop and the significantly decreasing Q_m. A distinctive aging is observed in the depinned ceramic. This study provides deep insights into the evolution of electrical properties of accepter‐modified alkali niobate perovskite ceramics under electric field cycling, quenching, and heating.

中文翻译：

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掺杂CuO的K0.5Na0.5NbO3陶瓷的压电和铁电特性的循环和热诱导演化

对于掺杂受体的钙钛矿压电陶瓷，材料的宏观特性（例如，硬化，疲劳和老化）与微观特性（例如，氧空位和缺陷偶极子）密切相关。在这项工作中，通过对材料进行电场循环，淬火，加热和时效处理，研究了掺杂CuO的K _0.5 Na _0.5 NbO ₃（KNN）陶瓷的宏观和微观特性之间的关系。在KNN中CuO的引入产生并产生了氧化氮。缺陷偶极子对铁电畴表现出明显的钉扎效应，因此引起了完全捏/双PE环和高Q _m的出色的硬化压电性2235.由于电场循环，淬火和加热引起的缺陷偶极子和铁电偶极子之间的短程对称均匀性的破坏，陶瓷可以被钉扎和软化。结果，脱钉的陶瓷具有开放的单个铁电磁滞回线和显着减小的Q _m。在脱销的陶瓷中观察到明显的老化。这项研究提供了在电场循环，淬火和加热条件下，受体修饰的碱金属铌酸盐钙钛矿陶瓷电性能演变的深刻见解。