What Is the Actual Local Crystalline Structure of Uranium Dioxide, UO 2 ? A New Perspective for the Most Used Nuclear Fuel
| Autor: | Lionel Desgranges, Ph. Garcia, Henry E. Fischer, Gianguido Baldinozzi, David Simeone, Yue Ma |
|---|---|
| Přispěvatelé: | Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Service d'Etudes de Simulation du Comportement du combustibles (SESC), Département d'Etudes des Combustibles (DEC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Service d'Analyses, d'Elaboration, d'Expérientations et d'Examens des combustibles (SA3E), Laboratoire Structures, Propriétés et Modélisation des solides (SPMS), Institut de Chimie du CNRS (INC)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Uranium dioxide Neutron diffraction Thermodynamics 02 engineering and technology Crystal structure Expected value 010402 general chemistry 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Spent nuclear fuel Symmetry (physics) 0104 chemical sciences [SPI.MAT]Engineering Sciences [physics]/Materials Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Thermoelectric effect Physical and Theoretical Chemistry 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Inorganic Chemistry Inorganic Chemistry, American Chemical Society, 2016, 56 (1), pp.321-326. ⟨10.1021/acs.inorgchem.6b02111⟩ Inorganic Chemistry, 2016, 56 (1), pp.321-326. ⟨10.1021/acs.inorgchem.6b02111⟩ |
| ISSN: | 0020-1669 1520-510X |
| Popis: | Up to now, uranium dioxide, the most used nuclear fuel, was said to have a Fm3m crystalline structure from 30 to 3000 K, and its behavior was modeled under this assumption. However, recently X-ray diffraction experiments provided atomic pair-distribution functions of UO2, in which UO distance was shorter than the expected value for the Fm3m space group. Here we show neutron diffraction results that confirm this shorter UO bond, and we also modeled the corresponding pair-distribution function showing that UO2 has a local Pa3 symmetry. The existence of a local lower symmetry in UO2 could explain some unexpected properties of UO2 that would justify UO2 modeling to be reassessed. It also deserves more study from an academic point of view because of its good thermoelectric properties that may originate from its particular crystalline structure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|