Temperature-Driven Structural Phase Transition in Tetragonal-Like BiFeO₃

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概要

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• 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 an $M_{\text{C}}$ monoclinic structure at room temperature [with a (010)_\text{pc symmetry plane, which contains the ferroelectric polarization]. Here, we show detailed temperature-dependent X-ray diffraction data that reveal a structural phase transition at ${\sim}100$ °C to a high-temperature $M_{\text{A}}$ phase [“tetragonal-like” but with a $(\bar{1}10)_{\text{pc}}$ symmetry plane]. These results indicate that the ferroelectric properties and domain structures of the strained BiFeO₃ are strongly temperature dependent.

• 2011-09-25

著者

• NAM Joong

  Materials Science and Technology Division, Oak Ridge National Laboratory

• CHRISTEN Hans

  Materials Science and Technology Division, Oak Ridge National Laboratory

• SIEMONS Wolter

  Materials Science and Technology Division, Oak Ridge National Laboratory

• Biegalski Michael

  Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.

関連論文

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