Influence of sintering temperature on the structure and piezoelectric properties of ZnO-modified (Li, Na, K)NbO_(3) lead-free ceramics  

作　　者：Hai-tao Li Bo-ping Zhang Wei-gang Yang Nan Ma 

机构地区：[1]School of Materials Science and Engineering, He'nan University of Science and Technology, Luoyang 471003, China [2]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2012年第9期843-848,共6页矿物冶金与材料学报(英文版)

基　　金：supported by the Beijing Natural Science Foundation (No.2112028);the Research Fund for the Doctoral Pro-gram of Higher Education of China (No.20090006110010);the Doctoral Start-up Fund of Henan University of Science and Technology(No.09001542)

摘　　要：ZnO-modified (Li, Na, K)NbO3 lead-free ceramics with a nominal composition of Li0.06(Na0.535K0.48)0.94NbO3+0.7mol% ZnO (LNKN-ZT) was synthesized normally at 930-1000℃. The Zn ions incorporated into the A-site at a higher sintering temperaVare, which changed LNKN-Z7 to soft piezoelectric ceramics with the mechanical quality factor decreasing from 228 to 192. A phase transition from tetragonal to orthorhombic symmetry was identified by XRD analysis, and the corresponding calculation of lattice parameters was conducted at 970-980℃. Because of such transitional behavior and fine microstructure, the optimized values of piezoelectric coefficient, planar electromechanical coupling coefficient, and relative dielectric constant were obtained.ZnO-modified (Li, Na, K)NbO3 lead-free ceramics with a nominal composition of Li0.06(Na0.535K0.48)0.94NbO3+0.7mol% ZnO (LNKN-ZT) was synthesized normally at 930-1000℃. The Zn ions incorporated into the A-site at a higher sintering temperaVare, which changed LNKN-Z7 to soft piezoelectric ceramics with the mechanical quality factor decreasing from 228 to 192. A phase transition from tetragonal to orthorhombic symmetry was identified by XRD analysis, and the corresponding calculation of lattice parameters was conducted at 970-980℃. Because of such transitional behavior and fine microstructure, the optimized values of piezoelectric coefficient, planar electromechanical coupling coefficient, and relative dielectric constant were obtained.

关 键 词：piezocemmics NIOBATES zinc oxide modification phase transitions PIEZOELECTRICITY SINTERING 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ628[化学工程—硅酸盐工业]