Abstract
The properties of BaO/MgO-type interface in the BaZrO3/MgO(001) heterostructure are studied by aberration-corrected high-resolution transmission electron microscopy combined with first-principles calculations. Experimental evidence demonstrates that cation displacement and vacancies occur at the interface. Our first-principle 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.
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