Coexisting morphotropic phase boundary and giant strain gradient in BiFeO3films

doi:10.1063/5.0048635

CORC > 兰州理工大学 > 兰州理工大学

	Coexisting morphotropic phase boundary and giant strain gradient in BiFeO3films
	Tang, Y.L.3; Zhu, Y.L.3,4; Zou, M.J.1,4; Wang, Y.J.3; Ma, X.L.2,3
刊名	Journal of Applied Physics
	2021-05-14
卷号	129 期号:18
关键词	Bismuth compounds Electric fields High resolution transmission electron microscopy Iron metallography Oxide films Perovskite Polarization Scanning electron microscopy Strain Aberration-corrected scanning transmission electron microscopies Built-in electric fields Large compressive strains Morphotropic phase boundaries Piezoelectric response Polarization direction Spontaneous polarizations Tetragonal and rhombohedral phasis
ISSN号	00218979
DOI	10.1063/5.0048635
英文摘要	Large compressive strains may introduce giant tetragonality and morphotropic phase boundaries in perovskite BiFeO3 films, where the coexisting tetragonal and rhombohedral phases (T like and R like phases) are identified to exhibit large piezoelectric response. Here, we have further achieved mechanical bending deformations in R like BiFeO3 through its neighboring T like BiFeO3 phases, where a strain gradient of ∼106/m was identified. Aberration-corrected scanning transmission electron microscopy revealed not only the strain distributions but also the atomic scale Fe polar displacement in the gradient R like BiFeO3. In spite of the giant strain gradient, the polarization direction in each R like BiFeO3 unit cell was found mainly along its diagonal direction, suggesting that potential flexoelectric coupling induced polarization in BiFeO3 is smaller than its spontaneous polarizations, while a large built-in electric field can be obtained via the large strain gradient. Our results indicate that the common phase coexistences in oxide materials could be further manipulated to introduce elastic strain gradients and tune the properties for oxide films. © 2021 Author(s).
WOS研究方向	Physics
语种	英语
出版者	American Institute of Physics Inc.
WOS记录号	WOS:000649074000002
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/151118]
专题	兰州理工大学
作者单位	1.Institute of Physics, Chinese Academy of Sciences, Beijing; 100190, China; 2.State Key Lab of Advanced Processing and Recycling on Non-ferrous Metals, Lanzhou University of Technology, Langongping Road 287, Lanzhou; 730050, China 3.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang; 110016, China; 4.Songshan Lake Materials Laboratory, Dongguan, Guangdong; 523808, China;
推荐引用方式 GB/T 7714	Tang, Y.L.,Zhu, Y.L.,Zou, M.J.,et al. Coexisting morphotropic phase boundary and giant strain gradient in BiFeO3films[J]. Journal of Applied Physics,2021,129(18).
APA	Tang, Y.L.,Zhu, Y.L.,Zou, M.J.,Wang, Y.J.,&Ma, X.L..(2021).Coexisting morphotropic phase boundary and giant strain gradient in BiFeO3films.Journal of Applied Physics,129(18).
MLA	Tang, Y.L.,et al."Coexisting morphotropic phase boundary and giant strain gradient in BiFeO3films".Journal of Applied Physics 129.18(2021).