【摘要】 Pb(Zr1-xTix)O3 (PZT)是一种重要的钙钛矿结构铁电固溶体 ,在其准同型相界处发现单斜相引起研究的热潮 .文章报道了作者最近对沿着 [10 0 ]赝立方方向组分调制的PZT体系的铁电性质的研究结果 .发现组分调制导致极化偏离调制方向 ,在准同型相界附近诱导出新型的铁电三斜相和C型单斜相 ,以及极高的机电特性 .证明偶极相互作用是导致以上行为的主要微观机制 .更多还原

【Abstract】 Pb(Zr 1-x Ti x)O 3(PZT) is an important perovskite alloy. The discovery of a low temperature monoclinic phase in PZT near the morphotropic phase boundary has inspired intensive interest. We report on our recent study of the properties of PZT alloys compositionally modulated along the [100] pseudocubic direction near the morphotropic phase boundary. It is shown that compositional modulation causes the polarization to rotate continuously away from the modulation direction, resulting in the appearance of unexpected triclinic and C-type monoclinic ground states, and huge enhancement of the electromechanical response. The orientation dependence of the dipole-dipole interaction in the modulated structure is revealed as the microscopic mechanism responsible for these anomalies.更多还原