High dielectric constant can be reached in a reductive-sintered Sr_(1-x)Ba_(x)TiO_(3)barrier-layer capacitor with core‒rim structures as dominant microstructural features.By SEM and aberration-corrected TEM observatio...High dielectric constant can be reached in a reductive-sintered Sr_(1-x)Ba_(x)TiO_(3)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 liquidphase.The synergetic evolution of core‒rim structures,SreO 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.展开更多
基金supported by the Postdoctoral Fellowship Program of CPSF(Grant No.GZC20240969)the National Natural Science Foundation of China(Grants No.51532006 and No.51702168)+3 种基金Shanghai Technical Service Center for Advanced Ceramics Structure Design and Precision Manufacturing(NO.20DZ2294000)the support from Beijing Municipal Natural Science Foundation(Grant No.1212016)the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant No.XDB36000000)the CAS Pioneer Hundred Talents Program.
文摘High dielectric constant can be reached in a reductive-sintered Sr_(1-x)Ba_(x)TiO_(3)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 liquidphase.The synergetic evolution of core‒rim structures,SreO 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.
