Temperature Driven Structural Phase Transition in Tetragonal-Like BiFeO3

Details Temperature Driven Structural Phase Transition in Tetragonal-Like BiFeO3 Temperature Driven Structural Phase Transition in Tetragonal-Like BiFeO3

2011-07-17

arxiv.org/abs/1107.3273v1

Applied Physics Express vol. 4 pg. 95801 (2011)

Physics

Condensed Matter

Materials Science

10 pages, 3 figures

Scientific paper

10.1143/APEX.4.095801

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

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