Direct Observation of Ferroelectric Domain Walls in LiNbO3: Wall-Meanders, Kinks, and Local Electric Charges

作者：Gonnissen Julie; Batuk Dmitry; Nataf Guillaume F; Jones Lewys; Abakumov Artem M; Van Aert Sandra; Schryvers Dominique^*; Salje Ekhard K H

来源：Advanced Functional Materials, 2016, 26(42): 7599-7604.

DOI：10.1002/adfm.201603489

Direct observations of the ferroelectric domain boundaries in LiNbO3 are performed using high-resolution high-angle annular dark field scanning transmission electron microscopy imaging, revealing a very narrow width of the domain wall between the 180 degrees domains. The domain walls demonstrate local side-way meandering, which results in inclinations even when the overall wall orientation follows the ferroelectric polarization. These local meanders contain kinks with "head-to-head" and "tail-to-tail" dipolar configurations and are therefore locally charged. The charged meanders are confined to a few cation layers along the polarization direction and are separated by longer stretches of straight domain walls.

• 出版日期2016-11-8
• 单位中国地震局