Bismuth layer-structured ferroelectrics (BLSFs) exhibit remarkable advantages for high-temperature piezoelectric sensor applications due to their ultra-high Curie temperature TC and high resistivity ρ. Bismuth titanate-tantalate (Bi3TiTaO9, abbreviated as BTT) is a type of typical BLSF with a high TC of ~870 °C, demonstrating its great potential for high temperature piezoelectric applications. However, the high temperature piezoelectric properties of BTT have not been sufficiently studied yet. In this work, the chromium-modified BTT ceramics were prepared, and the structural, electrical, dielectric, ferroelectric, and piezoelectric properties of the chromium-modified BTT were investigated in detail. With the intrinsic contribution of the enhanced lattice distortion and the extrinsic contribution of the domain wall movement, an excellent d33 of 16.3 pC/N was obtained. Meanwhile, the optimal composition exhibits an ultrahigh TC of 882 ℃ and a large ρ of ~105 Ω cm at 600 ℃, as well as stable in-situ and thermal annealing behaviors of d33 up to 500 ℃, demonstrating that BTT-based ceramics are promising candidates for high temperature applications.
Track ID:
1.4
Track Name:
ISAF: Characterization & Properties of Ferroelectrics & Related Materials
