LOW-FIRING SOL-GEL DERIVED Mn-DOPED 0.92(K_(0.5)Na_(0.5))NbO_(3)-0.08LiNbO_(3)LEAD-FREECERAMICS WITH ENHANCED PIEZOELECTRIC PROPERTIES  

作　　者：YUDONG HOU CHAO WANG JINGYANG RONG HAIYAN GE MANKANG ZHU HUI YAN 

机构地区：[1]Department of Materials Science and Engineering Beijing Uniwversity of Technology,Beijing 100124,P.R.China

出　　处：《Journal of Advanced Dielectrics》2011年第4期447-454,共8页先进电介质学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51072008,No.51172006);the Natural Science Foundation of Beijing(Grant No.2102006);the Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality,IHLB(Grant No.PHR201008012,No.PHR201007101).

摘　　要：Mn-doped 0.92(K_(0.5)Na_(0.5))NbO_(3)-0.08LiNbO_(3)(0.92KNN-0.08LN)lead-free piezoelectric cer-amics have been prepared by a developed sol-gel routes using Nb_(2)O_(5)as Nb source.Due to thehigh quality of gel precursor,Mn-doped 0.92KNN-0.08LN nanopowders with the mean particlesize about 20 nm were obtained at 500℃.The addition of Mn can promote the densification ofnanopowders effectively at 950℃,and also influences in a pronounced way both the crystal structure and microstructure of the materials.With the increase of the amount of Mn addition,0.92KNN-0.08LN ceramics are transformed from dominant orthorhombic to coexistence of the orthorhombic and tetragonal phases,and the grain sizes are enhanced simultaneously.Optimizedparameters,such as d_(33)=212 pC/N and k_(p)=0.46,were achieved in 0.2 Mn-doped0.92KNN-0.08LN systems,which are good candidate material for lead-free piezoelectric devices.

关 键 词：NIOBATES sol-gel processes sintering dielectric properties piezoelect ric properties 

分 类 号：TB3[一般工业技术—材料科学与工程]