Piezoelectric Properties of(Na0.5K0.5-xLix)NbO3 Ceramics

作     者：Peng QI Jinfeng WANG Baoquan MING Juan DU Xinghua LIANG Limei ZHENG 

作者机构：School of Physics Shandong University Jinan 250100 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2007年第23卷第6期

页      面：833-836页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant No.50572056) 

主　　题：Lead-free Piezoelectric Dielectric Morphotropic phase boundary 

摘      要：Lead-free piezoelectric ceramics （Na0.5K0.5-xLix）NbO3 （x=0.057-0.066） were synthesized by an ordinary sin-tering technique. Substituting Li for K can lead to structural distortion, which improves the Curie temperature （To） greatly. By adding appropriate LiNbO3 content, piezoelectric constant d33 values reach 202-212 pC/N. Electromechanical coefficients of the planar mode reach 44.4%-46.8%. The dielectric loss is below 2.6%, which is much lower than reported （about 50%）. The To of （Na0.5K0.5-xLix）NbO3 （x=0.057-0.066） is in the range of 490-510℃, at least 70℃ higher than that of pure （Na0.5K0.5）NbO3 ceramics. The results show that （Na0.5K0.5-xLix）NbO3 ceramic is a kind of good lead-free high-temperature piezoelectric material.