Molten Salt Synthesis of (K_(0.47)Na_(0.47)Li_(0.06))NbO_3 Lead-Free Piezoelectric Ceramics  

作　　者：李建华 孙清池 马卫兵 

机构地区：[1]School of Material Science and Engineering,Tianjin University

出　　处：《Transactions of Tianjin University》2010年第2期152-155,共4页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China (No.10232030);Key Laboratory for Advanced Ceramics and Machining Technology,Ministry of Education,Tianjin University (No. x06050)

摘　　要：(K0.47Na0.47Li0.06)NbO3 (KNLN) lead-free ceramics were prepared by molten salt synthesis (MSS) method using k2CO3-Na2CO3 eutectic mixtures as the flux. The microstructure and piezoelectric properties when sintered at 980-1 030 ℃ were investigated. The calcined powders were examined by X-ray diffraction. The microstructure of the calcined powders and sintered bodies was observed using a scanning electron microscope (SEM).The piezoelectric constant d33 was measured using a quasi-static piezoelectric d33 meter. The planar coupling coefficient Kp was calculated by resonance-antiresonance method. The experimental data for each sample's performance indicators were the average values of 8 specimens. The relative densities of sintered specimens are above 97%, and the dielectric loss is below 0.03. It was found that (K0.47Na0.47Li0.06)NbO3 prepared by MSS is compact and lead-free. The piezoelectric constant d33 is 216 pC·N-1 and the planar electromechanical coupling factor Kp is 0.352.（K0.47Na0.47Li0.06）NbO3 （KNLN） lead-free ceramics were prepared by molten salt synthesis （MSS） method using k2CO3-Na2CO3 eutectic mixtures as the flux. The microstructure and piezoelectric properties when sin- tered at 980- 1 030 ℃ were investigated. The calcined powders were examined by X-ray diffraction. The microstruc- ture of the calcined powders and sintered bodies was observed using a scanning electron microscope （SEM）. The pie- zoelectric constant d33 was measured using a quasi-static piezoelectric d33 meter. The planar coupling coefficient Kp was calculated by resonance-antiresonance method. The experimental data for each sample＇s performance indicators were the average values of 8 specimens. The relative densities of sintered specimens are above 97%, and the dielectric loss is below 0.03. It was found that （K0.47Na0.47Li0.06） NbO3 prepared by MSS is compact and lead-free. The piezoelectric constant d33 is 216 pC.N 1 and the planar electromechanical coupling factor Kp is 0.352.

关 键 词：microstructure PIEZOELECTRICITY X-ray diffraction （XRD） MSS method 

分 类 号：TQ174.754[化学工程—陶瓷工业]