1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, 110016 Shenyang, China [2].
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, 110016 Shenyang, China.
Sci Rep. 2014 Feb 18;4:4115. doi: 10.1038/srep04115.
The atomic-scale structural and electric parameters of the 90° domain-walls in tetragonal ferroelectrics are of technological importance for exploring the ferroelectric switching behaviors and various domain-wall-related novel functions. We have grown epitaxial PbTiO3/SrTiO3 multilayer films in which the electric dipoles at 90° domain-walls of ferroelectric PbTiO3 are characterized by means of aberration-corrected scanning transmission electron microscopy. Besides the well-accepted head-to-tail 90° uncharged domain-walls, we have identified not only head-to-head positively charged but also tail-to-tail negatively charged domain-walls. The widths, polarization distributions, and strains across these charged domain-walls are mapped quantitatively at atomic scale, where remarkable difference between these domain-walls is presented. This study is expected to provide fundamental information for understanding numerous novel domain-wall phenomena in ferroelectrics.
四方铁电体中 90°畴壁的原子尺度结构和电参数对于探索铁电体的开关行为和各种畴壁相关的新功能具有重要的技术意义。我们已经生长了外延 PbTiO3/SrTiO3 多层薄膜，通过相衬校正扫描透射电子显微镜对铁电 PbTiO3 中 90°畴壁的电偶极子进行了表征。除了公认的头对头的无电荷 90°畴壁之外，我们还不仅识别出头对头的正电荷畴壁，还识别出尾对尾的负电荷畴壁。这些带电畴壁的宽度、极化分布和应变在原子尺度上进行了定量映射，显示出它们之间的显著差异。这项研究有望为理解铁电体中许多新的畴壁现象提供基础信息。
