退火处理对铅基弛豫型铁电体介电、压电性能的影响

Effects of Thermal Annealing on the Dielectric and Piezoelectric Properties of Lead-based Ferroelectric Ceramics

铅基弛豫型铁电体的峰值介电常数和压电性能在退火后有较大提高．在PMN－PT陶瓷中，k_p由58％提高到66％，峰值介电常数由30900提高到37200，d_(33)达到530pC／N.在PZN－PT－BT陶瓷中，k_p由35％提高到51％，峰值介电常数km由11400提高到29000，d_(33)由347PC／N提高到624pC／N．

After thermal annealing, dielectric and piezoelectric properties of lead-based ferroelectric ceramics increase apparently. In PMN-PT system, E=37200, kp=66% d33=530pC/N were obtained;in PZN-PT-BT system, m=29000, kp=51% d33 =624pC/N were obtained. Thermal annealing isa good way to improve the dielectric and piezoelectric properties of lead-based ferroelectric ceramics, and this effect can be attributed to the grain boundary layer and domain wall motion in thesematerials.