本文通过一步反应合成法制备了铌镁-锆钛酸铅(Pb(Mg1/3Nb2/3)O3-Pb(Zr,Ti)O3, PMN-PZT)压电陶瓷, 研究了稀土元素钐(Sm)掺杂对PMN-PZT(x%(摩尔分数)Sm-PMN-PZT)结构与电学性能的影响规律, 得到了具有高压电性、高机电耦合系数和高居里温度的压电陶瓷。当x=2.0时, 压电常数d33=611 pC/N, 机电耦合系数kp=0.68, 介电损耗tan δ=1.65%,相对介电常数εr=2 650, 居里温度TC=283 ℃。测试压电陶瓷电致应变性能, 在3 kV/mm下单极电致应变达到0.20%, 显示出其大应变材料的特征。结果表明, Sm掺杂PMN-PZT压电陶瓷具有优异的综合电学性能, 有望在换能器、传感器以及致动器等领域广泛应用。

In this paper, the Pb(Mg1/3Nb2/3)O3-Pb(Zr,Ti)O3(PMN-PZT) piezoelectric ceramics were prepared by one-step synthesis method. The effect of Sm-doping on the structure and electrical properties of PMN-PZT ceramics were investigated. High piezoelectric performances are achieved in 2.0% (mole fraction) Sm-PMN-PZT ceramics, which are piezoelectric constant d33=611 pC/N, electromechanical coupling coefficient kp=0.68, dielectric loss tan δ=1.65%, relative dielectric constant εr=2 650, along with a high Curie temperature TC=283 ℃. Furthermore, a large unipolar strain of 2.0%Sm-PMN-PZT ceramics is attained to be 0.20% at the electric field of 3 kV/mm, which shows the characteristic of large strain material. These results suggest that the Sm-doped PMN-PZT ceramics with outstanding comprehensive properties are promising in the field of transducers, sensors, actuators, etc.