A study of one-dimensional incommensurate modulated structure determination in high-resolution transmission electron microscopy

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	A study of one-dimensional incommensurate modulated structure determination in high-resolution transmission electron microscopy
	Li, XM ; Ge, BH ; Li, FH ; Luo, HQ ; Wen, HH
刊名	ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
	2014
卷号	70 页码:563
关键词	incommensurate modulated structures high-resolution transmission electron microscopy electron-diffraction intensity correction phase extension
ISSN号	0108-7673
通讯作者	Li, FH (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, PO 603, Beijing 100190, Peoples R China.
中文摘要	The methods for determining incommensurate modulated structures (IMSs) in high-resolution transmission electron microscopy have been studied and improved to a level more perfect than before. This is demonstrated by means of the IMS determination for Bi2.31Sr1.69CuO6+ as an example. First, as previously, the projected potential map (PPM) of the IMS with resolution 0.2nm was obtained after image deconvolution from a [100] image. Secondly, the resolution of the PPM was enhanced to 0.1nm through phase extension combined with the electron-diffraction data so that the substitutional and displacive modulation functions could be determined. Thirdly, a (2+1)-dimensional structure model that corresponds to the [100] projected IMS was built for calculating the related partial structure factors that were utilized to correct the experimental electron-diffraction intensities for both main and satellite reflections. After three cycles of diffraction-intensity correction and phase extension, all unoverlapped atoms projected along the [100] direction in Bi2.31Sr1.69CuO6+ were resolved, and the modulations of substitution and displacement could be observed clearly. The substitution of Bi for Sr atoms at the Sr(O) columns was seen in the final PPM and verified by high-dimensional image simulation.
资助信息	National Basic Research Program of China [2006CB601001, 2011CBA001001]; National Natural Science Foundation of China [50672124, 10874207, 11104327, 11374332]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/58798]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Li, XM,Ge, BH,Li, FH,et al. A study of one-dimensional incommensurate modulated structure determination in high-resolution transmission electron microscopy[J]. ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES,2014,70:563.
APA	Li, XM,Ge, BH,Li, FH,Luo, HQ,&Wen, HH.(2014).A study of one-dimensional incommensurate modulated structure determination in high-resolution transmission electron microscopy.ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES,70,563.
MLA	Li, XM,et al."A study of one-dimensional incommensurate modulated structure determination in high-resolution transmission electron microscopy".ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 70(2014):563.