(K_(0.5)Na_(0.5))NbO_3无铅压电陶瓷的制备及性能研究  

A study on the preparation and properties of lead-free (K_(0.5)Na_(0.5))NbO_3 piezoelectric ceramics

作　　者：王林芳[1] 常云飞[1] 杨祖培[1] 

机构地区：[1]陕西师范大学化学与材料科学学院,陕西西安710062

出　　处：《西北大学学报（自然科学版）》2007年第4期591-594,共4页Journal of Northwest University（Natural Science Edition）

基　　金：陕西省自然科学基金资助项目(2005B16)

摘　　要：目的制备(K0.5Na0.5)NbO3(KNN)无铅压电陶瓷并研究其结构和性能。方法采用传统固相法,用XRD,SEM等手段对KNN无铅压电陶瓷材料的相结构和显微形貌进行了表征。结果KNN压电陶瓷材料为单一的正交晶系的钙钛矿结构。对KNN无铅压电陶瓷的电性能测试表明,KNN陶瓷具有高的压电常数d33=127 pC/N,高的机电耦合系数Kp=0.41,高的温度Tc=428℃和低的介电损耗tanδ=0.028(10 kHz)的优点;KNN陶瓷存在着饱满的电滞回线,其剩余极化率Pr为18.8μC/cm2,其矫顽场Ec为9.65 kV/cm;所得的陶瓷的密度和电性能要远优于用同样制备方法和烧结方式所得的陶瓷的性能,并且也优于用等静压工艺所得的陶瓷的性能。结论KNN陶瓷是高频压电器件较理想的备选材料之一。Aim To prepare lead-free（K0.5Na0.5）NbO3 piezoelectric ceramics and investigate the structure and properties.Methods By conventional mixed-oxide method,study the phase structure and microstructure by XRD and SEM mea1ns.Results The results show that the KNN ceramics are single perovskite phase with orthorhombic syngony.High piezoelectric constant（d33=127 pC/N）,high electromechanical coupling factor（Kp=0.41）,high Curie temperature（Tc=428℃） and low dielectric loss（tan δ=0.028） can be obtained from pure KNN ceramics,which are superior to those of ceramics with the same composition and prepared by the same method or by using the CIP process.Typical ferroelectric polarization hysteresis loops can be obtained from the ceramics with the remanent polarization Pr=18.8 μC/cm^2 and the coercive electric field Ec=9.65 kV/cm.Conclusion KNN ceramics are promising materials for high frequency piezoelectric equipments.

关 键 词：无铅压电陶瓷 (K0.5Na0.5)NbO3 压电性能 介电性能 铁电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]