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The ferroelectric and piezoelectric properties of strontium bismuth tantalate Sr x Bi y Ta 2 O 9 (Sr x Bi y T) ceramics were investigated. Well developed P(polarization)-E(electric field) hysteresis loops were observed for all samples except for the Sr 1.0 Bi y T(y>2) ceramics. A large remanent polarization (2P r ＝26 µC/cm 2 ) was observed for the Sr 0.8 Bi 2.15 T ceramics sintered at 1150ºC. For the Sr 0.8 Bi 2.2 T ceramics, the determined electromechanical coupling factor (k p = 9.7%) and mechanical quality factor (Q m = 4500) with a radial-extensional mode were obtained. Those of the stoichiometric SBT ceramics are k p = 4.0%. The cation vacancy and/or Bi incorporation into the Sr site of SrBi 2 Ta 2 O 9 were effective for enhancement of the electromechanical coefficients.

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Table 2 and dielectric, elastic constants in Table 3. The authors regret this oversight.