抗还原型PZT压电陶瓷的制备与性能

Preparation and Properties of Reduction-Resistant PZT Piezoelectric Ceramics

采用固相法制备出可在低氧压和还原性气氛中烧结的压电陶瓷材料。材料最佳组成为:Pb0.95Sr0.05(Zr0.54Ti0.46)O3+0.03%(质量分数)CuO+0.05%Nd2O3+1.00%Sb2O3。通过施主和受主共掺杂,既抑制了烧结过程中氧空位扩散,又避免了Ti4+与自由电子结合转变成为Ti3+,使陶瓷保持了压电性能。结果表明:添加半径合适的稀土元素,是使陶瓷具有抗还原性能的关键之一。当烧结温度为1050℃时,陶瓷压电应变常数d33=294 pC/N,平面机电耦合系数kp=43.56%,相对介电常数εT33/ε0=1 333,介电损耗tanδ=0.019 7。该材料可应用于与Ni、Cu等贱金属低温共烧的叠层压电器件中,能够大大降低器件的成本。

A piezoelectric ceramic, which can be sintered under low-oxygen condition and reducing atmosphere, was prepared by a solid state reaction method. The optimal composition was Pb0.95Sr0.05（Zr0.54Ti0.46）O3 with 0.03% in mass CuO, 0.05% Nd203 and 1.00% Sb203. It was found that through the donor and acceptor co-doping, the diffusion of oxygen vacancies was restrained, and the transformation of Ti4＋ to Ti3＋ was prevented, thus giving the superior piezoelectric properties of the ceramic. The results show that the addition of proper rare earth elements is closely related to the reduction-resistant performance. When the sintering temperature was 1 050 ℃, the optimum properties of the ceramic were achieved, i.e., d33 = 294 pC/N, kp =43.56%, tan 8= 0.019 7, and εT33/ε0 = 1 333. This material could be used in the multilayer piezoelectric devices co-fired with base metals at low temperature, by which the production costs could be reduced.