%0 Journal Article %T 钠过量0.94(K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub>-0.06LiNbO<sub>3</sub>无铅压电陶瓷显微结构和电学性能的研究<br>Microstructure and Electrical Properties of Sodium-Excess 0.94(K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub>-0.06LiNbO<sub>3</sub> Lead-Free Piezoceramics %A 马余 %A 薛旦旦 %A 陈志谦 %A 蒋显全 %A 刘岗 %A 徐尊平 %A 陈异< %A br> %A MA Yu %A XUE Dan-dan %A CHEN Zhi-qian %A JIANG Xian-quan %A LIU Gang %A XU Zun-ping %A CHEN Yi %J 西南大学学报(自然科学版) %D 2017 %R 10.13718/j.cnki.xdzk.2017.12.026 %X 采用固相合成法制备了0.94(K<sub>0.5</sub>Na<sub>0.5+x</sub>) NbO<sub>3</sub>-0.06LiNbO<sub>3</sub>无铅压电陶瓷，并对钠过量对陶瓷的晶体结构、显微形貌、电学性能的影响进行了研究. XRD测试结果显示，所研究的所有陶瓷样品均为单一钙钛矿结构，而且在室温下均为正交相和四方相两相共存.当<i>x</i>=0.01时，陶瓷具有最优的压电性能，其压电常数<i>d</i><sub>33</sub>、相对介电常数<i>ε<sub>r</sub></i>、平面机电耦合系数<i>K<sub>p</sub></i>和厚度机电耦合系数<i>K<sub>t</sub></i>分别为255pC/N，850，0.46和0.42.研究结果可以为KNN基压电陶瓷的结构和性能调控提供有益的参考.<br>A 0.94(K<sub>0.5</sub>Na<sub>0.5+x</sub>) NbO<sub>3</sub>-0.06LiNbO<sub>3</sub> lead-free piezoceramics was synthesized with the solid-state reaction method, and its crystal structure, microstructure, and electrical properties were investigated. The X-ray diffraction results showed that all samples of the studied ceramics possessed a pure perovskite structure, and orthorhombic and tetragonal phases co-existed at room temperature. When <i>x</i>=0.01, the ceramics showed the optimum piezoelectric properties, and the piezoelectric constant <i>d</i><sub>33</sub>, relative dielectric constant <i>ε<sub>r</sub></i>, planar electromechanical coupling factor <i>K<sub>p</sub></i> and thickness electromechanical coupling factor <i>K<sub>t</sub></i> were 255 pC/N, 850, 0.46 and 0.42, respectively. The research results in this paper could provide a beneficial reference for the regulation of the structure and properties in KNN-based piezoelectric ceramics %K 无铅压电陶瓷 %K KNN %K 压电性能 %K 钙钛矿< %K br> %K lead-free piezoceramics %K potassium sodium niobate (KNN) %K piezoelectric property %K perovskite %U http://xbgjxt.swu.edu.cn/jsuns/html/jsuns/2017/12/201712026.htm