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.
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).
