High dielectric constant can be reached in a reductive-sintered Sr1–xBaxTiO3 barrier-layer capacitor with core‒rim structures as dominant microstructural features. By SEM and aberration-corrected TEM observations, an interfacial zone between the core and rim, named as white-rim (w-rim), was found always enriched with Ba, while the core was free of Ba solution. The reductive liquid-phase sintering resulted in three times the concentrations of oxygen vacancies (VO) into cores and rims compared to their A-site vacancies (VA), while enabling the highest concentration of VO (∼17%) without VA in w-rim. The strained core/w-rim interfaces, with obvious interfacial polarizations, which can effectively raise the dielectric constant, were expected to be created from a temporary equilibrium between the cores and the liquid-phase. The synergetic evolution of core‒rim structures, Sr–O vacancies, multiple internal polarized structures can be utilized to better control and optimize dielectric behaviors and other functionalities for perovskite capacitors and other multi-functional ceramics.

中文翻译：

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电介质 Sr1–xBaxTiO3 陶瓷中 Sr[sbnd]O 空位和核心边缘界面结构的协同工程


在以磁芯边缘结构为主要微观结构特征的还原烧结 Sr1–xBaxTiO3 势垒层电容器中可以达到高介电常数。通过 SEM 和像差校正的 TEM 观察，发现核心和边缘之间的界面区，称为白边缘 （w-rim），始终富含 Ba，而核心不含 Ba 溶液。与 A 位空位 （VA） 相比，还原液相烧结导致芯和轮辋中的氧空位 （VO） 浓度是其三倍，同时在 w 轮辋中实现最高浓度的 VO （∼17%），而无 VA。应变的核/w 边缘界面具有明显的界面极化，可以有效地提高介电常数，预计是由核和液相之间的临时平衡产生的。磁芯边缘结构的协同演化、Sr-O 空位、多个内部极化结构可用于更好地控制和优化钙钛矿电容器和其他多功能陶瓷的介电行为和其他功能。