Sb对Li掺杂的KNN无铅压电陶瓷性质的影响  

Effect of Sb on Properties of Li Modified KNN Lead-free Piezoceramics

作　　者：臧国忠[1] 孙洪元[1] 孙天华[1] 王文文[1] 

机构地区：[1]聊城大学材料科学与工程学院,山东聊城252059

出　　处：《聊城大学学报（自然科学版）》2009年第2期40-43,共4页Journal of Liaocheng University:Natural Science Edition

基　　金：国家自然科学基金资助项目(50802038);聊城大学大学生科技文化创新项目(SRT08011CL2)

摘　　要：采用传统工艺制备了无铅压电陶瓷(Na_(0.5)K_(0.45)Li_(0.05))Sb_xNb_(1-x)O_3,研究了Sb掺杂对其压电、铁电、介电等性质的影响.实验结果表明,样品的居里点(T_C)、正交-四方相变温度(T_(T-O))均随Sb含量的增加而降低,掺杂7 mol%Sb时,样品的居里点从454℃降至345℃,T_(T-O)从100℃降至室温以下.Sb^(5+)的引入限制了晶粒的生长,但提高了样品的致密度,从而提高了样品的压电、铁电性能.组分为(Na_(0.5) K_(0.45)Li_(0.05))Sb_(0.05)Nb_(0.95)O_3的样品具有较为优异的性能:d_(33)=241 pC/N,Q_m=50,k_p=38.3%,d_(31)=-83 pC/N,g_(31)1=-0.08 Vm/N,P_r=17μC/cm^2,同时,该组分样品表现最"软",具有相对最高的弹性柔顺常数S_(11)~E=14.2.（Na0.5 K0.45 Li0.05） SbxNb1-xO3 ceramics were prepared by conventional oxide solid-solution technique and the effect of Sb on the piezoelectric, ferroelectric and dielectric properties were investigated. The results show that Both Curie temperature （To） and orthorhombic-tetragonal phase transition temperature （TT-o） decreased with increasing Sb content. For the composition with 7mol% Sb, TC and TT-o decreased from 454 oC and 100℃ to 345 oC and below room temperature,respectively. The addition of Sb inhibited the grain growth whereas,improved the ceramic density and piezoelectric, ferroelectric properties. The relative ＂soft＂ sample of （Na0. 5 K0. 45 Li0. 05 ） Sb0.05 Nb0.95O3 shows high performance of d33 =241 pC/N,Qm=50,kp =38.3% ,d31 =-83 pC/N,g31 =-0.08Vm/N,Pr=17μC/cm2 and SE11 =14.2.

关 键 词：无机非金属材料 无铅压电陶瓷 KNN 导纳圆图 居里温度 

分 类 号：TM22[一般工业技术—材料科学与工程]