Data analysis method to achieve sub-10 pm spatial resolution using extended X-ray absorption fine-structure spectroscopy

被引:11
作者
Du, Yonghua [1 ]
Wang, Jia-ou [2 ]
Jiang, Longhua [3 ]
Borgna, Lucas Santiago [1 ]
Wang, Yanfei [4 ]
Zheng, Yi [5 ]
Hu, Tiandou [2 ]
机构
[1] ASTAR, Inst Chem & Engn Sci, Singapore 627833, Singapore
[2] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[3] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
[4] Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
[5] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore
关键词
EXAFS; spatial resolution; atom distribution function; PAIR DISTRIBUTION FUNCTION; EXAFS SPECTRA; REAL-SPACE; LAFE1-XCRXO3; DISTORTIONS; LACOO3;
D O I
10.1107/S1600577514010406
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Obtaining sub-10 pm spatial resolution by extended X-ray absorption fine structure (EXAFS) spectroscopy is required in many important fields of research, such as lattice distortion studies in colossal magnetic resistance materials, high-temperature superconductivity materials etc. However, based on the existing EXAFS data analysis methods, EXAFS has a spatial resolution limit of pi/2 Delta k which is larger than 0.1 angstrom. In this paper a new data analysis method which can easily achieve sub-10 pm resolution is introduced. Theoretically, the resolution limit of the method is three times better than that normally available. The method is examined by numerical simulation and experimental data. As a demonstration, the LaFe1-xCrxO3 system (x = 0, 1/3, 2/3) is studied and the structural information of FeO6 octahedral distortion as a function of Cr doping is resolved directly from EXAFS, where a resolution better than 0.074 angstrom is achieved.
引用
收藏
页码:756 / 761
页数:6
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