Li部分取代K对KNN基无铅压电陶瓷微结构、晶相和电学性能的影响  

Effects of the process of K substituted partly by Li on microstructure,crystalline phase and electrical properties of KNN-base lead-free piezoelectric ceramics

作　　者：彭浩[1] 徐芳[1] 张卫[1] 周桃生 尚勋忠[1] 

机构地区：[1]有机化工新材料湖北省协同创新中心,湖北大学材料科学与工程学院,湖北武汉430062

出　　处：《湖北大学学报（自然科学版）》2015年第2期139-142,共4页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金(11175062;51472079)资助

摘　　要：研究Li部分取代K对铌酸钾钠(KNN)无铅压电陶瓷性能的影响,选用(Na0.5K0.5-xLix)Nb O3(NKLxN)的配方,通过固相法制备出优良性能的陶瓷样品;运用XRD、SEM研究不同Li含量陶瓷样品的相结构及显微组织;通过压电介电性能测试,确定Li取代K的最佳含量.结果表明,当Li的含量x=0.065时,其d33=205p C/N,kp=46.1%,εr=998,tanδ=0.047,TD=485℃.该NKLxN陶瓷性能优良,在高温压电陶瓷传感器、换能器等方面可能取代铅基压电陶瓷.Effects of the process of K substituted partly by Li on the microstructure,dielectric and piezoelectric properties of KNN-base lead-free piezoelectric ceramics were investigated.（Na0.5K0.5-xLix）NbO3 （NKLxN） lead- free piezoelectric ceramics were synthesized by conventional mixed- oxide method.The microstructure,phase structure and electrical properties were investigated as a function of Li addition,the optimum by Li for K were determined via evaluation of the piezoelectric and dielectric properties of the resulting ceramics. The results show that the piezoelectric coefficient （d33）,electromechanical coupling coefficient（kp）reaches to peak values,205 pC/N,46.1%andεr=998,tanδ=0.047,TD=485℃for the sample of x=0.065. The combination of high transition temperature,high piezoelectric performances makes the NKLxN ceramics prepared with the given process a very good candidate for replacing the lead-base piezoelectric ceramics in high-temperature piezoelectric sensors and transducers,etc.

关 键 词：无铅压电陶瓷 KNN Li取代 结构 压电介电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]