High dielectric constant can be reached in a reductive-sintered Sr_1–xBa_xTiO₃ 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 (V_O) into cores and rims compared to their A-site vacancies (V_A), while enabling the highest concentration of V_O (∼17%) without V_A 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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介电 Sr1–xBaxTiO3 陶瓷中 Sr\u2012O 空位和核心\u2012边缘界面结构的协同工程


在还原烧结 Sr_1–xBa_xTiO₃ 势垒层电容器中可以达到高介电常数，其磁芯\边缘结构是主要的微观结构特征。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，还原液相烧结导致磁芯和轮辋中的氧空位（V_O）浓度是其三倍，同时在w轮辋中没有V_A的情况下实现了最高浓度_的VO（∼17%）。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\u2012O 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。