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DAFS measurements using the image-plate Weissenberg method
N Sugioka1, K Matsumoto, M Tanaka
1Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta 4259, Midori, Yokohama 226-8503, Japan.
Journal of Synchrotron Radiation
|July 21, 2004
Summary
A new instrumental technique for DAFS measurements offers site-specific data. This method utilizes advanced optics and the image-plate Weissenberg method for detailed crystallographic analysis.
Area of Science:
- Materials Science
- Crystallography
- Spectroscopy
Background:
- X-ray absorption spectroscopy (XAS) is crucial for materials characterization.
- Diffraction Anomalous Fine Structure (DAFS) provides site-specific electronic and structural information.
- Existing DAFS techniques can be limited in spatial resolution or applicability.
Purpose of the Study:
- To propose and validate a novel instrumental technique for DAFS measurements.
- To achieve site-specific crystallographic information with enhanced precision.
- To demonstrate the technique's capability using cobalt oxides.
Main Methods:
- Utilized focusing optics with parabolic mirrors and a double-crystal monochromator.
- Employed both Laue and Bragg diffraction geometries.
- Implemented image-plate Weissenberg method for data collection at multiple energies.
Main Results:
- Successfully performed single-crystal DAFS measurements at the Co K-absorption edge.
- Analyzed specific reflections (200, 220, 311 of CoO; 511, 911 of Co(3)O(4)).
- Applied regression analysis, Fourier transforms, and back-Fourier filtering for data interpretation.
Conclusions:
- The proposed instrumental technique is effective for site-specific DAFS measurements.
- This method enhances the ability to probe local atomic environments in crystalline materials.
- The study demonstrates a robust approach for advanced crystallographic and electronic structure analysis.