The Effect of Bi Ions Substituting at the Sr Site in SrBi<sub>2</sub>Ta<sub>2</sub>O<sub>9</sub>

  • Miura Kaoru
    Research Center, Sony Corporation, 134 Goudo–cho, Hodogaya–ku, Yokohama 240, Japan
  • Tanaka Masahiro
    Research Center, Sony Corporation, 4–14–1 Asahi–cho, Atsugi 243, Japan

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タイトル別名
  • The Effect of Bi Ions Substituting at the Sr Site in SrBi2Ta2O9.
  • Effect of Bi Ions Substituting at the Sr Site in SrBi2Ta2O9

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説明

The possibility of the substitution of Bi ions at the Sr site in SrBi2Ta2O9 (SBT) was investigated using calculations of the electronic structures. The Sr ions in SBT do not have a covalent bonding with the surrounding O ions, unlike the substituted Bi ions at the Sr site. Due to the covalent interaction, the Bi ions rather than the Sr ions favour displacement, which is consistent with the experimental result that the remanent polarization of Sr-deficient and Bi-excess SBT is larger than that of stoichiometric SBT. The difference in valency between the Sr and Bi ions seems to be accounted for by the compensation due to the change in the Bi ion valency at the Sr site. We conclude that there is a possibility of the substitution of Bi ions at the Sr site in Sr-deficient and Bi-excess SBT.

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