Dielectric and Piezoelectric Properties of Nonstoichiometric SrBi2Ta2O9 and SrBi2Nb2O9 Ceramics |
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| Authors: | J. A. Cho S. E. Park T. K. Song M. H. Kim H. S. Lee S. S. Kim |
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| Affiliation: | (1) Department of Ceramic Science and Engineering, Changwon National University, Changwon, Kyongnam, 641-773, Korea;(2) Department of Physics, Changwon National University, Changwon, Kyongnam, 641-773, Korea |
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| Abstract: | Nonstoichiometric SrBi2Ta2O9 (SBT) and SrBi2Nb2O9 (SBN) ceramics were prepared by a solid state reaction method. X-ray diffraction analysis showed that single-phase of Bi-layered perovskite was obtained. With different Sr/Bi content ratios of SBT and SBN, Curie temperature (TC), electromechanical factor (Kp) and mechanical quality factor (Qm) were measured. TC of SBN (SBT) rose from 414 C (314C) to 494C (426C) when Sr/Bi content ratio was increased from 0.55/2.3 to 1.2/1.8. In the most Sr-deficient/Bi-excess ratio of 0.55/2.3, the maximum values of Qm were obtained approximately 1013 and 3325 for SBT and SBN, respectively. |
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| Keywords: | Bi-layered perovskite Curie temperature electromechanical factor mechanical quality factor |
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