Sb掺杂对0.96(K_(0.49)Na_(0.51))(Nb_(0.97-x)Ta_(0.03)Sb_x)O_3-0.04Bi_(0.5)(Na_(0.8)K_(0.2))_(0.5)ZrO_3无铅压电陶瓷结构与电性能的影响研究  

Effect of Sb Doping on the Structure and Electrical Properties of 0.96(K_(0.49)Na_(0.51))(Nb_(0.97-x)Ta_(0.03)Sb_x) O_3-0.04Bi_(0.5)(Na_(0.8)K_(0.2))_(0.5)ZrO_3 Lead-free Piezoelectric Ceramics

作　　者：沈万程 沈宗洋[1] 李月明[1] 王竹梅[1] 骆雯琴[1] 宋福生[1] 谢志翔[1] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院江西省先进陶瓷材料重点实验室,景德镇333403

出　　处：《人工晶体学报》2016年第1期47-52,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51262011);江西省科技支撑计划项目(20132BBE50014);江西省高等学校科技落地计划项目(KJLD13076);江西省青年科学家"井冈之星"培养对象计划项目(20142BCB23020);江西省研究生创新基金(YC2014-S302)

摘　　要：采用固相法制备了0.96(K_(0.49)Na_(0.51))(Nb_(0.97-x)Ta_(0.03)Sb_x)O_3-0.04Bi_(0.5)(Na_(0.8)K_(0.2))_(0.5)ZrO_3(0.96KNNTS_x-0.04BNKZ x=0,0.01,0.02,0.03,0.04)无铅压电陶瓷,研究了Sb掺杂量对0.96KNNTS_x-0.04BNKZ陶瓷相结构、微观结构和电性能的影响规律。X射线衍射(X-ray Diffraction,XRD)分析结果表明:0.96KNNTS_x-0.04BNKZ陶瓷具有纯钙钛矿结构,随着Sb掺杂量x的增加,陶瓷由正交-四方两相共存逐渐转变为四方相,在x≤0.01时,陶瓷为正交-四方两相共存的多型相转变(Polymorphic Phase Transition,PPT)结构,而当x≥0.02时,陶瓷则转变为四方相结构。在PPT向四方相转变的组成边界x=0.02处,陶瓷具有优异的电性能:压电常数d_(33)=345 pC/N,机电耦合系数k_p=39.2%,机械品质因数Q_m=51,介电常数ε_(33)~T/ε_0=1520,介电损耗tanδ=2.7%,剩余极化强度P_r=15.4μC/cm^2,矫顽场E_c=1.09 kV/mm,居里温度T_c=275℃。0.96(K_(0.49)Na_(0.51))(Nb_(0.97-x)Ta_(0.03)Sb_x)O_3-0.04Bi_(0.5)(Na_(0.8)K_(0.2))_(0.5)ZrO_3(0.96KNNTS_x-0.04 BNKZ x =0,0.01,0.02,0.03,0.04) lead-free piezoelectric ceramics were prepared by solid state reaction method.The effect of Sb doping amount x on the crystal structure,microstructure and electrical properties of the 0.96KNNTS_x-0.04 BNKZ ceramics was investigated.X-ray Diffraction(XRD) results indicate that all the samples possess a pure perovskite structure.With the increase of Sb doping amount,the phase structure of the samples gradually changes from the coexistence of orthorhombic and tetragonal phases to tetragonal phases,and a polymorphic phase transition(PPT) structure with the coexistence of orthorhombic and tetragonal phases can be found when x ≤0.01,while the ceramics transform to tetragonal phases when x≥0.02.The ceramics with x =0.02 on the compositional side from PPT to tetragonal exhibit optimized electrical properties as follows:d_(33) = 345 pC/N,k_p =39.2%,Q_m=51,ε_(33)~T/ε_0 =1520,tanδ= 2.1%,P_r= 15.4 μC/cm^2,E_c =1.09 kV/mm and T_c =275 ℃.

关 键 词：无铅压电陶瓷 铌酸钾钠 锆酸铋钠钾 多型相转变 

分 类 号：TQ174.1[化学工程—陶瓷工业]