CAJ | 학술논문

以水热法制备的KNbO3，NaNbO 3，BiFeO 3（BF）粉体等为原料，采用常压烧结法在1065℃下烧结2 h制备了0．992K0．5 Na0．5 NbO3-0．008BiFeO 3无铅压电陶瓷，并研究了BiFeO 3掺杂对0．992K0．5 Na0．5 NbO3-0．008BiFeO 3无铅压电陶瓷结构和压电的影响．研究结果表明：BiFeO 3掺杂使K0．5 Na0．5 NbO3无铅压电陶瓷正交相减弱，晶粒尺寸由6μm 减小到1μm ；压电性能有一定提高，压电常数（d33）、机电耦合系数（kp ）分别达到120 pC/N 和37．8，居里温度Tc由444．4℃减少至420．6℃．
이수열법제비적KNbO3，NaNbO 3，BiFeO 3（BF）분체등위원료，채용상압소결법재1065℃하소결2 h제비료0．992K0．5 Na0．5 NbO3-0．008BiFeO 3무연압전도자，병연구료BiFeO 3참잡대0．992K0．5 Na0．5 NbO3-0．008BiFeO 3무연압전도자결구화압전적영향．연구결과표명：BiFeO 3참잡사K0．5 Na0．5 NbO3무연압전도자정교상감약，정립척촌유6μm 감소도1μm ；압전성능유일정제고，압전상수（d33）、궤전우합계수（kp ）분별체도120 pC/N 화37．8，거리온도Tc유444．4℃감소지420．6℃．
In this study , Lead-free piezoelectric ceramics of the 0 .992 (Na0.5K0.5 ) NbO3-0 .008BiFeO3 were prepared at 1025℃ for 2h ,following the mixed pure KNbO3 (KN ) , NaNbO3 (NN) ,BiFeO3 (BF) powers which were prepared by a hydrothermal method .The phase structure and the electric properties of the ceramics were studied .It is found that the doping of BiFeO3 decreases the value of orthogonality of the KNN ceramics and decreases the grain size from 6 μm to 1 μm .Simultaneously the piezoelectric properties is increasing ,the piezoelectric constant d33 and planar mode electromechanical coupling coefficient kp reach to 120 Pc/N and 37 .8 ,the curie temperature Tc decreases from 444 .4 ℃ to 420 .6 ℃ .