Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na_0.5Bi_0.5TiO₃ Thin Films.

ABSTRACT: The oxygen octahedral rotation (OOR) forms fundamental atomic distortions and symmetries in perovskite oxides and definitely determines their properties and functionalities. Therefore, epitaxial strain and interfacial structural coupling engineering have been developed to modulate the OOR patterns and explore novel properties, but it is difficult to distinguish the 2 mechanisms. Here, different symmetries are induced in Na_0.5Bi_0.5TiO₃ (NBT) epitaxial films by interfacial oxygen octahedral coupling rather than epitaxial strain. The NBT film grown on the Nb:SrTiO₃ substrate exhibits a paraelectric tetragonal phase, while with La_0.5Sr_0.5MnO₃ as a buffer layer, a monoclinic phase and robust ferroelectricity are obtain

SUBMITTER: Han H 

PROVIDER: S-EPMC10351392 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature