锂掺杂KNN-BNKT无铅压电陶瓷性能研究  

EFFECTS OF LINBO_3-DOPING ON PROPERTIES OF KNN-KNBT LEAD-FREE PIEZOELECTRIC CERAMICS

作　　者：何航[1] 李珍[1] 刘立峰[1] 

机构地区：[1]中国地质大学(武汉)材料科学与化学工程学院,武汉430074

出　　处：《中国陶瓷》2011年第5期30-33,67,共5页China Ceramics

摘　　要：采用液相包覆法制备了结构致密的铌酸钾钠基[(K0.5Na0.5NbO3-K0.1Na0.4Bi0.5TiO3)-xLiNbO3,0≤x≤0.02]无铅压电陶瓷,研究了掺杂Li+对铌酸钾钠钛酸铋钾钠K0.5Na0.5NbO3-K0.1Na0.4Bi0.5TiO3(KNN-BNKT)晶体结构和压电、介电性能的影响。结果表明:当Li+含量在x取0～0.010(摩尔分数)时,陶瓷样品均形成了均一的钙钛矿型结构。Li+掺杂量对陶瓷压电、介电性能有很大的影响,其压电常数(d33)随着Li+掺杂量的增加先升高后降低,并在x=0.010的时候取得最大值。实验表明:当x=0.01时,(K0.5Na0.5NbO3-K0.1Na0.4Bi0.5TiO3)-xLiNbO3无铅压电陶瓷表现出较好的压电性能:d33=173pC/N,相对介电常数εr=620.745,介电损耗tanδ=0.0132,kp=27.35%,kt=26.34%,Qm=48.97。（1-x）（K0.5Na0.5NbO3-K0.1Na0.4Bi0.5TiO3）-xLiNbO3 lead-free piezoelectric ceramics were prepared by the HPLC method of coated.Effects of LiNbO3 on crystal structure and piezoelectric properties and Dielectric properties of the KNN-BKNT ceramics were investigated.The results reveal that KNN-BKNT ceramic samples doped with 0～0.02%（mole fraction）LiNbO3 possess pure perovskite structure.The dielectric and piezoelectric properties of the ceramics are affected obviously by the LiNbO3-doped amount.The piezoelectric constant（d33） with the increase in LiNbO3 doped first and then decreased,and when x=0.01 to obtain the maximum value.Experiments reveals that：The time when x=0.01,the lead-free piezoelectric ceramics show good piezoelectric properties： d33=173pC/N,the relative dielectric constant εr=620.745,dielectric loss tanδ=0.0132,kp=27.35%,kt=26.34%,Qm=48.97.

关 键 词：无铅压电陶瓷 铌酸钾钠 铌酸锂 压电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]