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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...
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