CeO_2掺杂对Pb_(0.92)Sr_(0.06)Ba_(0.02)(Sb_(2/3)Mn_(1/3))_(0.05)Zr_(0.48)Ti_(0.47)O_3基压电陶瓷相结构及性能的影响

Effects of CeO_2 Addition on Phase Structure and Properties of Pb_(0.92)Sr_(0.06)Ba_(0.02)(Sb_(2/3)Mn_(1/3))_(0.05)Zr_(0.48)Ti_(0.47)O_3 Piezoelectric Ceramics

采用传统固相烧结法制备Pb_(0.92)Sr_(0.06)Ba_(0.02)(Sb_(2/3)Mn_(1/3))_(0.05)Zr_(0.48)Ti_(0.47)O_3∶xCeO_2(简称PSBSM-PZT)压电陶瓷样品。研究不同CeO_2掺杂含量对PSBSM-PZT基陶瓷样品的物相结构、微观形貌、压电及介电性能的影响。结果表明:当CeO_2掺杂量x≤0.5%(质量分数,下同)时,陶瓷样品均为纯的钙钛矿结构。随着CeO_2掺杂含量的增加,陶瓷样品中四方相结构逐渐向三方相结构转变。随着CeO_2掺杂含量的进一步增加,陶瓷中出现焦绿石相,虽然陶瓷中已经出现焦绿石相,但是样品仍没有完全转变为三方相陶瓷;CeO_2掺杂具有细化晶粒的作用,当x=0.25%时样品晶粒晶界清晰,晶粒之间的结合相对致密,晶界处气孔率低,陶瓷断裂方式以沿晶断裂为主;当x=0.25%时,陶瓷样品获得最佳的压电与介电性能:d_(33)=346pC/N,k_p=0.60,Q_m=1396,ε_r=1309,tanδ=0.474%。

Pb0.92Sr0.06 Ba0.02 （Sb2/3 Mnl/3 ）0.05 Zr0.4s Ti0.47 03 ： XCeO2 piezoelectric ceramics were prepared by a conventional solid state reaction method. The effect of CeO2 addition on ＂the phase transition, mi crostructure piezoelectric and dielectric performances of samples were systematically investigated. The results show that ceramics are pure perovskite structure when ＂the doping amount of CeO2 is less ＂than or equal ＂to 0.50/00 （mass faction, ＂the same below）, with ＂the CeO2 doping content increasing, ＂the for marion of pyrochlore phase will be facilitated, but ＂the samples are still not completely ＂transformed ＂to rhombohedral phases; and CeO2 doping plays ＂the role of grain refinement, when x=0.25% ＂the sam ple has an even grain size, clear boundary and it also has lower porosity and higher density, ＂the main fracture mode of ＂the sample is intergranular fracture; when x=0. 25% ceramic samples obtain ＂the best piezoelectric and dielectric performance ： d33=346pC/N, kp=0.60, Qm=1396, εr=1309, tanδ=O. 474%.