Structural Changes and Ferroelectricity in Bi-Layered SrBi<sub>2</sub>Ta<sub>2</sub>O<sub>9</sub>

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  • Yamashita Haruyasu
    Department of Electronics and Information Engineering, Faculty of Engineering, Hokkai-Gakuen University, Sapporo 064-0926, Japan
  • Yoshio Keiji
    Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
  • Murata Wataru
    Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
  • Onodera Akira
    Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan

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  • Structural Changes and Ferroelectricity in Bi-Layered SrBi2Ta2O9.

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説明

Structural changes of bismuth-layered perovskite SrBi2Ta2O9 associated with ferroelectric phase transition were studied by X-ray powder Rietveld analysis. The crystal structure of SrBi2Ta2O9 is tetragonal in the paraelectric phase at 1000 K (I4/mmm, Rp = 5.64%, Rwp = 7.37%). The TaO6 octahedra are distorted along the a-axis and aligned in an antiparallel manner. In the ferroelectric phase, this crystal favors canted arrangements of octahedra below Tc (608 K). These result in net spontaneous polarization along the a-axis. SrBi2Ta2O9 undergoes a canted phase transition, analogous to canted ferromagnets with an antisymmetrical Dzialoshinski-Moriya-type interaction.

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