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W、Zr共同掺杂对铌酸钾钠基无铅压电陶瓷的影响
作者:郭朋彦1 张瑞珠1 郭雯鹏1 2 赵高磊2 闫镇威1 
单位:1. 华北水利水电大学机械学院 郑州 450045 2. 中国科学院声学研究所 北京 100190 
关键词:铌酸钾钠 无铅压电陶瓷 钨锆共同掺杂 晶体结构 热稳定性 
分类号:TB34
出版年,卷(期):页码:2016,44(9):1265-1269
DOI:10.14062/j.issn.0454-5648.2016.09.02
摘要:

采用传统固相烧结法制备了0.94(Na0.535K0.48)Nb1–x(W0.5Zr0.5)xO3–0.06LiSbO3(x=0, 0.01, 0.02, 0.03, 0.04)无铅压电陶瓷,其中,钨和锆以摩尔比为0.5:0.5组成掺杂共同体取代Nb,改变(W0.5Zr0.5)掺杂量x,观察钙钛矿结构B位异价元素的掺杂对铌酸钾钠基无铅压电陶瓷的影响。结果表明:陶瓷的晶体结构随着x的增加由四方相转变为正交相,晶格间距减小。掺杂量x=1%时,陶瓷的综合性能良好,压电常数为203 pC/N,机电耦合系数为0.309,相对介电常数为813,Curie温度为350 ℃,烧结性能也得到了提高。
 

Lead-free piezoelectric ceramics 0.94(Na0.535K0.48)Nb1–x(W0.5Zr0.5)xO3–0.06LiSbO3 (x=0, 0.01, 0.02, 0.03, 0.04) were fabricated by a conventional solid phase sintering method. In the ceramics, W6+ and Zr4+ appear as a group to replace Nb5+. And the effects that these cations with different valences brought to KNN-based lead-free piezoelectric ceramics were investigated. The results show that crystal structure changes from tetragonal to orthorhombic as the doping amount increases, and the lattice space distance becomes more covalent as well. In the ceramics, fine comprehensive properties can be achieved when x=1%, i.e., piezoelectric constant d33 is 203 pC/N, planar electromechanical coupling factor kp is 0.309, relative dielectric constant εr is 813, the Curie temperature TC is 350 ℃, and the sintering property is also improved. It is indicated that this doping method needs to be further investigated.
 

基金项目:
水利部科技推广计划(TG1420);华北水利水电大学高层次人才科研启动项目资助。
作者简介:
郭朋彦(1981—),男,博士,副教授。
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