Coexistence of ferroelectric triclinic phases in highly strained BiFeO 3 films
Résumé
Two tilted triclinic phases were found via synchrotron x-ray diffractions in the mixed-phase regions of highly strained BiFeO3 films. First-principles calculations suggest that these two triclinic phases originate from a phase separation of a single monoclinic state accompanied by elastic matching between the two phase-separated states and further suggest that the ease of phase transition between these two energetically close phases is responsible for the large piezoelectric responses observed in Zhang, Nat. Nano.10.1038/nnano.2010.265 6, 98 (2011). © 2011 American Physical Society.