Thermal and Structural Studies of Phase Transitions in Layered Perovskite SrBi2Ta2O9.

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  • Onodera Akira
    Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060–0810, Japan
  • Yoshio Keiji
    Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060–0810, Japan
  • Myint Cho Cho
    Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060–0810, Japan
  • Kojima Seiji
    Institute of Applied Physics, University of Tsukuba, Tsukuba 305–8573, Japan
  • Yamashita Haruyasu
    Department of Electronics and Information Engineering, Faculty of Engineering, Hokkai–Gakuen University, Sapporo 064–0926, Japan
  • Takama Toshihiko
    Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060–8628, Japan

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  • Thermal and Structural Studies of Phase Transitions in Layered Perovskite SrBi<sub>2</sub>Ta<sub>2</sub>O<sub>9</sub>

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Specific heat and X-ray diffraction (XRD) in Bi-layered perovskite Sr0.85Bi2.1Ta2O9 were measured. Two anomalies in Cp were observed at 670 K (Tc) and 510 K (T*) in Bi-rich Sr0.85Bi2.1Ta2O9, although no anomalies in ε and Ps have been reported around T*. The temperature dependence of XRD patterns shows that the crystal structure of Sr0.85Bi2.1Ta2O9 (orthorhombic, A21am at room temperature) transforms to a tetragonal phase (I4/mmm) above Tc, passing through a probable intermediate orthorhombic phase at T*. SrBi2Ta2O9 remains orthorhombic above Tc (608K) and becomes tetragonal at about 900 K. Stoichiometric SrBi2Ta2O9 and Bi-rich Sr0.85Bi2.1Ta2O9 show a fundamentally different sequence of phase transitions at high temperatures, although their crystal structures are isostructural in the ferroelectric phase.

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