Microstructural properties of spinel Li Fe5O8(LFO)films grown on(001)-oriented Sr TiO3(STO)substrates have been investigated at the atomic-scale by advanced electron microscopy techniques.Two types of orientation rela...Microstructural properties of spinel Li Fe5O8(LFO)films grown on(001)-oriented Sr TiO3(STO)substrates have been investigated at the atomic-scale by advanced electron microscopy techniques.Two types of orientation relationship(OR)between the LFO films and the STO substrates have been determined,cube-on-cube and(111)[ī10]LFO//(111)[1ī0]STO.Antiphase boundaries(APBs)and three types of twin boundaries(TBs)form within the LFO films,and the propagation of TBs and APBs results in their complex interactions.In most cases,interactions between TBs and APBs change the type of TBs and terminate the propagation of APBs since the APBs introduce a displacement vector of(a/4)110 into the TBs.In addition,the interactions between two coherent TBs are observed to generate the incoherent TB.The epitaxial strain of the LFO/STO(001)heterosystem can be released by the formation of TBs and APBs in the films and misfit dislocations at the interface.Considering that the magnetic coupling across the APBs and TBs can lead to novel physical properties,the appearance of APBs and TBs with a high density in the LFO films would affect the magnetic properties of the films.展开更多
The properties of BaO/MgO-type interface in the BaZrO3/MgO(001) heterostructure are studied by aberrationcorrected high-resolution transmission electron microscopy combined with first-principles calculations.Experimen...The properties of BaO/MgO-type interface in the BaZrO3/MgO(001) heterostructure are studied by aberrationcorrected high-resolution transmission electron microscopy combined with first-principles calculations.Experimental evidence demonstrates that cation displacement and vacancies occur at the interface. Our firstprinciple calculations show that cation displacement results from the electrostatic potential effect at the interface,and cation vacancies could lower the interfacial work of separation and enhance the interfacial stability of BaO/MgO-type interface. The results highlight that the effect of interfacial defects should be taken into account in understanding the film growth kinetics and properties in oxide heteroepitaxy.展开更多
基金financially supported by the National Basic Research Program of China(No.2015CB654903)the National Natural Science Foundation of China(Nos.51471169 and 51390472).
文摘Microstructural properties of spinel Li Fe5O8(LFO)films grown on(001)-oriented Sr TiO3(STO)substrates have been investigated at the atomic-scale by advanced electron microscopy techniques.Two types of orientation relationship(OR)between the LFO films and the STO substrates have been determined,cube-on-cube and(111)[ī10]LFO//(111)[1ī0]STO.Antiphase boundaries(APBs)and three types of twin boundaries(TBs)form within the LFO films,and the propagation of TBs and APBs results in their complex interactions.In most cases,interactions between TBs and APBs change the type of TBs and terminate the propagation of APBs since the APBs introduce a displacement vector of(a/4)110 into the TBs.In addition,the interactions between two coherent TBs are observed to generate the incoherent TB.The epitaxial strain of the LFO/STO(001)heterosystem can be released by the formation of TBs and APBs in the films and misfit dislocations at the interface.Considering that the magnetic coupling across the APBs and TBs can lead to novel physical properties,the appearance of APBs and TBs with a high density in the LFO films would affect the magnetic properties of the films.
基金supported by the Hundred Talents Project of Chinese Academy of Sciencesthe National Basic Research Program of China (No.2009CB623705)the National Natural Science Foundation of China (Nos.51471169 and 51390472)
文摘The properties of BaO/MgO-type interface in the BaZrO3/MgO(001) heterostructure are studied by aberrationcorrected high-resolution transmission electron microscopy combined with first-principles calculations.Experimental evidence demonstrates that cation displacement and vacancies occur at the interface. Our firstprinciple calculations show that cation displacement results from the electrostatic potential effect at the interface,and cation vacancies could lower the interfacial work of separation and enhance the interfacial stability of BaO/MgO-type interface. The results highlight that the effect of interfacial defects should be taken into account in understanding the film growth kinetics and properties in oxide heteroepitaxy.
