Effects of Different Sr and Bi Concentrations on Electrical Properties in SrBi₂Ta₂O₉ Ceramics

Ferroelectric SrBi ₂ Ta ₂ O ₉ (SBT) with different Sr/Bi ratio were synthesized. Crystallized single-phases with Bi-layered perovskite structure was confirmed by X-ray diffraction (XRD). With increasing Bi/Sr ratio, the Curie temperature T _c was increased and remanent polarization P _r increased. The dielectric and ferroelectric properties were strongly influenced by the Bi/Sr ratio. The effect on dielectric properties and ac conductivity were investigated as functions of temperature and frequency.

Keywords:

• SrBi₂Ta₂O₉ (SBT)
• ferroelectric
• ac conductivity

Acknowledgments

This work was supported by Korea Reserch Foundation Grant (KRF-2000-005-Y00070).

Paper originally presented at AMF-4, Bangalore, India, December 12–15, 2003