单斜晶系
相界
压电
材料科学
四方晶系
铁电性
正交晶系
结晶学
凝聚态物理
相(物质)
钙钛矿(结构)
中子衍射
矿物学
晶体结构
电介质
化学
物理
复合材料
光电子学
有机化学
作者
Deepam Maurya,Mitsuhiro Murayama,Abhijit Pramanick,W. T. Reynolds,Ke An,Shashank Priya
摘要
Perovskite piezoelectric compositions near the morphotropic phase boundary (MPB) are known to exhibit high piezoelectric response. In lead-based ABO3 compound with B-site disorder, the origin of this enhancement has been associated with the presence of an intermediate monoclinic/orthorhombic state that bridges the adjacent ferroelectric rhombohedral and tetragonal phases. However, the origin of high piezoelectric response in lead-free ABO3 compounds with A-site disorder has not been conclusively established. We describe a microscopic model derived from comparative analyses of high resolution transmission electron microscopy and neutron diffraction that explains the origin of high piezoelectric response in lead-free MPB compositions of 0.93(Na0.5Bi0.5)TiO3–0.07BaTiO3. Direct observation of nanotwins with monoclinic symmetry confirmed the presence of an intermediate bridging phase that facilitates a pathway for polarization reorientation. Monoclinic distortions of an average rhombohedral phase are attributed to localized displacements of atoms along the non-polar directions.
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