Anharmonic vibrations in UO2as determined by EXAFS
| Autor: | G.N. Greaves, N T Barrett, F.R. Thornley, B. T. M. Willis, G.M. Antonini |
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| Rok vydání: | 1988 |
| Předmět: |
Quantitative Biology::Biomolecules
Materials science Extended X-ray absorption fine structure Condensed matter physics Anharmonicity Nondestructive analysis General Engineering General Physics and Astronomy Lattice vibration Condensed Matter Physics Computer Science::Digital Libraries Quantitative Biology::Other Spectral line Vibration Condensed Matter::Materials Science Crystallography Absorption edge Physics::Chemical Physics Lattice model (physics) |
| Zdroj: | Journal of Physics C: Solid State Physics. 21:L791-L796 |
| ISSN: | 0022-3719 |
| DOI: | 10.1088/0022-3719/21/22/004 |
| Popis: | Anharmonicity in the lattice vibrations of oxygens in UO2 has been examined by using EXAFS of the ULIII absorption edge. Whilst the EXAFS-determined U-U distance of 3.89 AA closely matches the crystallographic separation, the U-O distance of 2.43 AA is 0.06 AA longer. This shift is interpreted on the basis of an anharmonic lattice model in which oxygens occupy anti-tetrahedral sites. |
| Databáze: | OpenAIRE |
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