基于准同型相界(morphotropic phase boundary, MPB) 线性组合规律,研究Pb(Mg_(1/3)Nb_(2/3))O_3 -Pb(Zn_(1/3)Nb_(2/3))O_3-PbTiO_3 (PMN-PZN-PT)三元系的MPB区域,并探求电学性能优越的组分.实验选取(1-x) (0.67 PMN- 0.33 PT)-x(0.91 PZN-0.09 PT) 系列中x=0～0.85的8个实验点;为减少焦绿石相的生成,陶瓷试样用铌铁矿预产物法合成,最终在1120～1160 ℃烧成.X射线衍射分析表明该系列试样均为钙钛矿结构,且处于四方与菱方两相共存态,验证了两个子二元系MPB组分的连线均为该三元系的MPB区域.少量的PZN-PT取代PMN-PT可以提高该三元系的电学性能;在x=0.1的组分获得该系列的最优性能:极值介电常数ε_(m,1 kHz)=28 030,剩余极化强度Pr=32.5 μC/cm~2,压电系数d_(33)=545 pC/N.
Based on the morphotropic phase boundary(MPB) compositions of the two subsystems, a series of (1 - x)(0.67 Pb(Mg_(1/3)Nb_(2/3))O_3 -Pb(Zn_(1/3)Nb_(2/3))O_3-PbTiO_3 in the ternary system with different x were studied. Ceramic samples were synthesized by the columbite precursor method. The microstructure, phase states and electrical properties of those samples were investigated as well. X-ray diffraction results demonstrated that all of the samples possess a pure perovskite structure, and lie within the MPB region, which verifies that the MPB region of PMN-PZN-PT ternary system exists along the line connecting the MPB regions of PMN-PT and PZN-PT binary subsystems. The maximum value of dielectric constant (ε_(m,1 kHz)=28030), remnant polarization (P_r=32.5 μC/cm~2) and piezoelectric property (d_(33)=545 pC/N) were obtained for the composition with x=0.1.
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