Converse flexoelectricity around ferroelectric domain walls

doi:10.1016/j.actamat.2020.03.054

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	Converse flexoelectricity around ferroelectric domain walls
	Wang, Y.J.2; Tang, Y.L.2; Zhu, Y.L.2; Feng, Y.P.1,2; Ma, X.L.2,3
刊名	Acta Materialia
	2020-06-01
卷号	191 页码:158-165
关键词	Calculations Domain walls Electromechanical devices Ferroelectricity Lead titanate Polarization Titanium compounds Transmission electron microscopy Aberration-corrected Asymmetric structures Electric polarization Ferroelectric domains First-principles calculation Flexoelectric coefficients Flexoelectricity Mechanical strain
ISSN号	13596454
DOI	10.1016/j.actamat.2020.03.054
英文摘要	Converse flexoelectricity is the mechanical strain induced by electric polarization gradients, which is largely omitted compared with the relatively well-known direct flexoelectricity. Thoroughly understanding the converse effect may not only explain peculiar structures generated by electric polarization or field gradients, but also stimulate new ideas to the design of novel electromechanical devices. In this work, the converse flexoelectricity around ferroelectric domain walls has been studied elaborately by synergetically integrating the aberration-corrected transmission electron microscope (TEM), first-principles calculations, and the Landau-Ginzburg-Devonshire (LGD) theory, taking prototypical tetragonal ferroelectric PbTiO3 as an example. We not only uncovered the important role of converse flexoelectricity on the asymmetric structure around 90° domain walls, but also quantified the flexoelectric coefficients. This quantification is deterministic in both the magnitude and sign of flexoelectric coefficients, by the mutual verification of the atomic mapping and first-principles calculations. Our results suggest that the converse flexoelectricity cannot be neglected for understanding ferroelectric DWs and other boundaries in ferroelectric materials. © 2020 Acta Materialia Inc.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Acta Materialia Inc
WOS记录号	WOS:000533619700014
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115593]
专题	兰州理工大学
作者单位	1.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Yuquan Road 19, Beijing; 100049, China; 2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang; 110016, China; 3.State Key Lab of Advanced Processing and Recycling on Non-ferrous Metals, Lanzhou University of Technology, Langongping Road 287, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Wang, Y.J.,Tang, Y.L.,Zhu, Y.L.,et al. Converse flexoelectricity around ferroelectric domain walls[J]. Acta Materialia,2020,191:158-165.
APA	Wang, Y.J.,Tang, Y.L.,Zhu, Y.L.,Feng, Y.P.,&Ma, X.L..(2020).Converse flexoelectricity around ferroelectric domain walls.Acta Materialia,191,158-165.
MLA	Wang, Y.J.,et al."Converse flexoelectricity around ferroelectric domain walls".Acta Materialia 191(2020):158-165.