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，kp由58％提高到66％，峰值介电常数由30900提高到37200，d33达到530pC／N.在PZN－PT－BT陶瓷中，kp由35％提高到51％，峰值介电常数km由11400提高到29000，d33由347PC／N提高到624pC／N．这种改善可能与晶界玻璃相的消除以及畴壁运动等因素有关
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.
参考文献
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