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Study on local structure around Ce and Gd atoms in CeO2-Gd2O3 binary system
T Nakagawa1, T Osuki, T A Yamamoto
1Department of Nuclear Engineering, Graduate School of Engineering, Osaka University, Suita, Japan.
Journal of Synchrotron Radiation
|August 22, 2001
Summary
This study measured X-ray absorption spectra of cerium (Ce) and gadolinium (Gd) binary oxides. Extended X-ray absorption fine structure analysis revealed that Ce-O and Gd-O bond distances increase with cerium content.
Area of Science:
- Materials Science
- Solid-State Chemistry
- X-ray Spectroscopy
Background:
- Cerium and gadolinium oxides are crucial in various applications.
- Understanding their structural properties is key to optimizing performance.
- C-type structure solid solutions offer tunable properties.
Purpose of the Study:
- To investigate the structural evolution of Ce(x)Gd(1-x)O(3+x)/2 solid solutions.
- To determine the interatomic distances between rare-earth and oxygen atoms.
- To correlate structural parameters with composition.
Main Methods:
- X-ray absorption spectra (XAS) near Ce and Gd K-edges were measured.
- Extended X-ray absorption fine structure (EXAFS) analysis was employed.
- Data was collected using the BL01B1 beamline at SPring-8.
Main Results:
- Interatomic distances R(Gd-O) and R(Ce-O) were evaluated.
- Both R(Gd-O) and R(Ce-O) were found to increase with increasing cerium content (x).
- R(Gd-O) was consistently larger than R(Ce-O) by approximately 0.1 Å.
Conclusions:
- The study provides precise measurements of Ce-O and Gd-O bond lengths in the solid solution.
- The observed increase in bond distances with cerium content is attributed to compositional changes.
- The findings validate the use of EXAFS for determining local atomic structures in mixed oxides.