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Highly-strained BiFeO3 exhibits a "tetragonal-like, monoclinic" crystalstructure found only in epitaxial films (with an out-of-plane lattice parameterexceeding the in-plane value by >20%). Previous work has shown that this phaseis properly described as a M$_{C}$ monoclinic structure at room temperature[with a (010)$_{pc}$ symmetry plane, which contains the ferroelectricpolarization]. Here we show detailed temperature-dependent x-ray diffractiondata that evidence a structural phase transition at ~100C to a high-temperatureM$_{A}$ phase ["tetragonal-like" but with a (1-10)$_{pc}$ symmetry plane].These results indicate that the ferroelectric properties and domain structuresof strained BiFeO$_3$ will be strongly temperature dependent.

Temperature Driven Structural Phase Transition in Tetragonal-Like BiFeO3