高斯分布
材料科学
Atom(片上系统)
傅里叶变换
格子(音乐)
流离失所(心理学)
光学
反铁电性
极化(电化学)
分子物理学
凝聚态物理
铁电性
物理
化学
计算机科学
光电子学
电介质
声学
量子力学
心理学
物理化学
心理治疗师
嵌入式系统
作者
Yang Zhang,Rong Yu,Jing Zhu
出处
期刊:Ultramicroscopy
[Elsevier]
日期:2022-01-01
卷期号:232: 113404-113404
被引量:2
标识
DOI:10.1016/j.ultramic.2021.113404
摘要
Structural distortions frequently occur in materials, either periodically (ferroelectric or antiferroelectric) or in local areas (domain boundaries, surfaces/interfaces, dislocations). Measuring atomic displacements from an average lattice is of crucial importance for analyzing structural distortions and their connections to physical properties. Conventionally, the displacements are measured atom-by-atom by fitting atomic-resolution images with two-dimensional gaussian functions. Here, we exhibit an efficient method, named Displacement Separation Analysis, DSA in short, to directly separate atomic displacements from an average lattice based on Fourier space filtering. Using antiferroelectric AgNbO3 as a model system, we demonstrate the consistence between DSA and gaussian fitting. The suppression of polarization at interfacial region of h-LuFeO3/α-Al2O3 heterostructure and the emergence of modulation structure in LuFe2O4+x is then revealed using DSA, attesting the implication of DSA in unveiling structural distortions either locally or periodically. Inspired by the simple principle of DSA, such method can be used for any atomic-resolution images, including TEM, STM, and AFM images to exhibit the atomic displacement intuitively.
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