中文摘要：

基于Pb（Mg1／3Nb2/3）O3-PbTiO3（PMN—PT）和PbZrO3-PbTiO3（PZT）两个赝二元体系的准同型相界组分和线性组合规律，设计了一系列具有准同型相界组分的PMN－PT—PZ赝三元体系。采用传统的铌铁矿预合成法制备了各组分的铁电陶瓷，研究了它们的相结构及介电、压电和铁电性能。研究表明，该系列PMN—PT—PZ赝三元系铁电陶瓷都具有三方与四方，旧共存的准同型结构和优异的电学性能。其中，PZ含量为40％（摩尔分数）的0．16PMN-0．44PT-0．4PZ铁电陶瓷样品具有最佳的综合电性能，其室温介电常数εr为2014，压电常数d33为410pC·N^-1，机电耦合系数kp为0．58，剩余极化强度Pr为34．5μC·cm^-1，矫顽场Ec为13．4kV·cm^-1。

英文摘要：

On the basis of the respective compositions near the morphotropie phase boundary （MPB） region of Pb （ Mg1/3 Nb2/3 ） 03-PbTiO3 （PMN-PT） and PbZrO3- PbTiO3 （PZT）, a series of compositions of PMN-PT- PZ pseudo ternary system were selected according to the proposed linear combination rules. The PMN-PT- PZ ceramics were fabricated by the conventional eo- lumbite precursor method, and their phase structures, dielectric, piezoelectric and ferroelectric properties were investigated systematically. The obtained results indicated that all the selected PMN-PT-PZ ceramics located in the rhombohedral/tetragonal coexistence MPB region and had excellent electrical properties. The special interest was focused on the composition 0.16PMN-0.44PT-0.4PZ, and optimum comprehensive electrical properties of room temperature dielectric constant εr = 2014, piezoelectric constant d33 = 410 pC ·N^-1, electromechanical factor kp = 0.58, remanant polarization Pr = 34. 5 μC·cm^-2 and coercive field Ec = 1.98 kV .cm^- 1 were observed at this composition.