【摘要】 采用固相法制备了0.96(K_0.49Na_0.51)(Nb_0.97-xTa_0.03Sb_x)O₃-0.04Bi_0.5(Na_0.8K_0.2)_0.5ZrO₃（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d₃₃=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ε₃₃^T/ε₀=1520,介电损耗tanδ=2.7%,剩余极化强度P_r=15.4μC/cm²,矫顽场E_c=1.09 kV/mm,居里温度T_c=275℃。更多还原

【Abstract】 0.96(K_0.49Na_0.51)(Nb_0.97-xTa_0.03Sb_x)O₃-0.04Bi_0.5(Na_0.8K_0.2)_0.5ZrO₃（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:d₃₃ = 345 pC/N,k_p =39.2%,Q_m=51,ε₃₃^T/ε₀ =1520,tanδ= 2.1%,P_r= 15.4 μC/cm²,E_c =1.09 kV/mm and T_c =275 ℃.更多还原