Abstract
Dielectric, ferroelectric and piezoelectric properties of perovskite ferroelectric and bismuth layered-structured ferroelectric (BLSF) ceramics are described as superior candidates for lead-free piezoelectric materials to reduce environmental damages. Perovskite type ceramics seem to be suitable for actuator and high power applications that are required a large piezoelectric constant, d_<33> (>300 pC/N) and a relatively high Curie temperature, Tc (>200℃). On the other hand, BLSF ceramics seem to be excellent candidates as piezoelectric sensors for high temperatures and piezoelectric ceramic resonators with high mechanical quality factor, Ωm and low temperature coefficient of resonance frequency, TC-f.
