中文摘要：

采用传统固相法制备了0.96（K0.5Na0.5）（Nb1–xSbx）O3-0.04Bi0.5Na 0.5Zr O3（0.96KNNSx-0.04BNZ,x=0,0.01,0.02,0.03,0.04,0.05）无铅压电陶瓷,系统研究了Sb含量对0.96KNNSx-0.04BNZ压电陶瓷晶相组成、显微结构及压电性能的影响规律。X射线衍射分析结果表明：0.96KNNSx-0.04BNZ陶瓷具有纯钙钛矿结构,随着Sb含量x的增加,陶瓷从正交-四方两相共存转变为四方相,x≤0.02时在正交-四方两相共存的多型相转变（Polymorphic Phase Transition,PPT）区域。在该PPT区域靠近四方相的边界x=0.02处,陶瓷具有优异的压电性能：压电常数d33=354 pC/N;平面机电耦合系数kp=43.6%;机械品质因数Qm=46;相对介电常数εr=2100;介电损耗tanδ=2.6%,居里温度tC=290℃。

英文摘要：

0.96（K0.5Na0.5）（Nb1–xSbx）O3-0.04Bi0.5Na 0.5ZrO3 （0.96KNNSx-0.04BNZ, x=0, 0.01, 0.02, 0.03, 0.04, 0.05） lead-free piezoelectric ceramics were prepared by a solid state reaction method. The effect of Sb amount on the crystal structure, microstructure and electrical properties of the ceramics was investigated. X-ray Diffraction results show that all the samples have a pure perovskite structure. With the increase of Sb amount, the phase structure of the samples translates from the coexistence of orthorhombic and tetragonal phases to tetragonal phases. A polymorphic phase transition （PPT） region existing in the presence of orthorhombic and tetragonal phases is found when x≤0.02. The ceramics with the composition of x=0.02 in the tetragonal side of the PPT region have optimal electrical properties as follows： the piezoelectric constant d33=354 pC/N, electromechanical coupling factor kp=43.6%, mechanical quality factor Qm=46, relative dielectric constant εr=2100, dielectric loss tanδ=2.6% and Curie temperature tC=290 ℃.