Sm2O3掺杂(Ba0.7Ca0.3)TiO3-Ba(Zr0.2Ti0.8)O3无铅压电陶瓷的制备与性能

摘要

采用固相合成法制备了Sm2O3掺杂的(Ba0.7Ca0.3)TiO3-Ba(Zr0.2T0.8)O3(BCZT)无铅压电陶瓷.借助XRD、SEM等手段对该陶瓷的显微结构与电性能进行了研究.结果表明,Sm2O3的掺杂降低了BCZT无铅压电陶瓷的烧结温度并使居里温度点Tc从85℃提高到95℃.当Sm2O3掺杂量为O.02wt％～0.1wt％时,样品具有典型ABO3型钙钛矿结构.Sm2O3掺杂量为O.02wt％时,所得陶瓷样品具有最优综合电性能,其压电常数d33、机电耦合系数kp、机械品质因子Qm、介电损耗tanδ和介电常数εr分别为590pC/N、0.52、43、1.3％和3372.%Sm2O3 doped (Ba0.7Ca0.3)TiO3-Ba(Zr0.2Ti0.8)O3 (BCZT) lead-free piezoelectric ceramics were prepared by solid state synthesis method. The microstructure and electrical properties of prepared ceramics were investigated by XRD, SEM and other techniques. The results demonstrate that Sm2O3 doping reduces sintering temperature of BCZT lead-free piezoelectric ceramics and increases the Curie temperature Tc from 85 ℃ to 95℃. BCZT ceramics doped with 0.02wt% - 0.1 wt% Sm2O3 possess a typical AB03 type perovskite structure.With the doping of 0.02wt% Sm2O3, the BCZT ceramics show the optimum electrical properties, and its piezoelectric constant d33, electromechanical coupling factor Kp, mechanical quality factor Qm, dielecteic loss tanδ and relative dielectric constant e, reach 590 pC/N, 0.52,43,1.3% and 3372, respectively.