Mapping Octahedral Tilts and Polarization Across a Domain Wall in BiFeO3 from Z-Contrast Scanning Transmission Electron Microscopy Image Atomic Column Shape Analysis

被引：138

作者：

Borisevich, AlbinaY. ^{[1
]}

Ovchinnikov, Oleg S. ^{[2
]}

Chang, Hye Jung ^{[1
]}

Oxley, Mark P. ^{[1
,3
]}

Yu, Pu ^{[4
]}

Seidel, Jan ^{[4
]}

Eliseev, Eugine A. ^{[5
]}

Morozovska, Anna N. ^{[6
]}

Ramesh, Ramamoorthy ^{[4
]}

Pennycook, Stephen J. ^{[1
]}

Kalinin, Sergei V. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[3] Vanderbilt Univ, Dept Phys, Nashville, TN 37240 USA

[4] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[5] Natl Acad Sci Ukraine, Inst Problems Mat Sci, Kiev, Ukraine

[6] Natl Acad Sci Ukraine, Inst Semicond Phys, Kiev, Ukraine

来源：

ACS NANO | 2010年 / 4卷 / 10期

基金：

美国能源部;

关键词：

ferroelectric domain walls; bismuth ferrite; scanning transmission electron microscopy; principal component analysis; SOLID-SOLUTION SYSTEM; THERMODYNAMIC THEORY; FERROELECTRICITY; SCALE;

D O I：

10.1021/nn1011539

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Oxygen octahedral tilts underpin the functionality of a large number of perovskite-based materials and heterostructures with competing order parameters. We show how a precise analysis of atomic column shapes in Z-contrast scanning transmission electron microscopy images can reveal polarization and octahedral tilt behavior across uncharged and charged domain walls in BiFeO3. This method is capable of visualizing octahedral tilts to much higher thicknesses than phase contrast imaging. We find that the octahedral tilt transition across a charged domain wall is atomically abrupt, while the associated polarization profile is diffuse (1.5-2 nm). Ginzburg-Landau theory then allows the relative contributions of polarization and the structural order parameters to the wall energy to be determined.

引用

页码：6071 / 6079

页数：9

共 40 条

[1] Sheet superconductivity in twin walls:: experimental evidence of WO3-x [J].