Piezoelectric and ferroelectric properties of SrBi2(Nb1−χTaχ)2O9 ceramics

SrBi2(Nb1−χTaχ)2O9 (0 ≤ χ ≤ 1.0) bismuth layered structured ferroelectric (BLSF) ceramics were prepared by the conventional solid-state reaction sintering method. XRD analysis indicated that a single phase of SrBi2(Nb1−χTaχ)2O9 was formed for all compositions. The substitution of Ta for Nb decreases Curie temperature (Tc), maximum permittivity (ɛm), remnant polarization (Pr) and coercive field (Ec), whereas temperature coefficient of resonance frequency (TCF) increases with the increase in Ta content for SrBi2(Nb1−χTaχ)2O9. All of compositions have a low permittivity (ɛr), a low electromechamical coupling coefficient (Kp) and a high mechanical quality factor (Qm), which are advantageous to be used in piezoelectric resonator device.