Bi_(0.5)K_(0.5)TiO_3掺杂对0.945K_(0.5)Na_(0.5)NbO_3-0.045LiSbO_3无铅压电陶瓷结构性能的影响  

PHASE STRUCTURE AND PIEZOELECTRIC PROPERTIES OF LEAD-FREE 0.945K_(0.5)Na_(0.5)NbO_3-0.045LiSbO_3 WITH DOPING Bi_(0.5)K_(0.5)TiO_3

作　　者：张跃峰[1] 雷新荣[1] 李娇[1] 张恒 孙涛[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8期25-27,35,共4页China Ceramics

摘　　要：采用传统固相合成法合成(1-x)(0.945K0.5Na0.5NbO3-0.045LiSbO3)-x(Bi0.5K0.5TiO3)(简记为(KNN-LS)(1-x)-BKTx))无铅压电陶瓷,研究不同BKT掺入量(x=0.000,0.005,0.010,0.015,0.020,0.025,0.030)对该体系陶瓷的微观结构和压电介电性能。结果表明:x≤0.025时,均可形成单一钙钛矿结构;与KNN-LS相比,体积密度(ρ)、机械耦合系数kp、kt显著提高;d33、介电损耗tanδ、机械品质因数Qm和次级相变温度降低;当x=0.020时,样品的整体性能达到最佳值:ρ=4.239g/cm3,d33=94pC/N,kp=30.9%,kt=20.7%,tanδ=0.024,相对介电常数εT33/ε0=2468,Qm=53.95,次级相变温度降至室温以下,温度稳定性好。（1-x）（0. 945K0.5Na0.5NbO3-0. 045LiSbO3）-x（Bi0.5K0.5TiO3）（（KNN-LS） （1-x） -BKTx）） lead-free piezoelectric ceramic were prepared by conventional solid state reaction techniqueand. The effects of BKT on crystal structure and piezoelectric properties were investigated. The results reveal that single perovskite structure is got when x≤0.025;Density （ρ） , coupling coefficient Kp, kt improve and piezoelectric constant d33, dielectric loss tan δ,mechanical quality factor Om and secondary phase transition temperature TO-T smaller comparing with KNN.A specimen doped with x=0.020 exhibited the best electrical properties , tan δ=4.239 g/cm^3, d33=94pC/N, Kp=30.9%, Kt=20.7%, tan δ=0.024, ε^T33/ε0=2468, Qm=53.95 and TO-T lowed room temperature.

关 键 词：无铅压电陶瓷 钛酸铋钠 结构性能 

分 类 号：TM282[一般工业技术—材料科学与工程]