Understanding Strain-Induced Phase Transformations in BiFeO₃ Thin Films.

ABSTRACT: Experiments demonstrate that under large epitaxial strain a coexisting striped phase emerges in BiFeO₃ thin films, which comprises a tetragonal-like (T') and an intermediate S' polymorph. It exhibits a relatively large piezoelectric response when switching between the coexisting phase and a uniform T' phase. This strain-induced phase transformation is investigated through a synergistic combination of first-principles theory and experiments. The results show that the S' phase is energetically very close to the T' phase, but is structurally similar to the bulk rhombohedral (R) phase. By fully characterizing the intermediate S' polymorph, it is demonstrated that the flat energy landscape resulting in the absence of an energy barrier

SUBMITTER: Dixit H 

PROVIDER: S-EPMC5115423 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature