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Correlation effects and energetics of point defects in uranium dioxide: A first principle investigation


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Titre de la revue : Philosophical Magazine Volume : 87 N° : 16-17 Pagination : 2561-2569 Date de publication : 01/04/2007

Type de document > *Article de revue

Mots clés > dioxyde d'uranium

Unité de recherche > IRSN/DPAM/SEMIC/LETR

Auteurs > BRILLANT Guillaume, GUPTA Florence, PASTUREL Alain

Date de publication > 01/04/2007

Résumé

Density functional (DFT) calculations have been used to investigate the stability of point defects in uranium dioxide. Correlation effects are taken into account within the DFT + U approach as implemented in the Vienna ab initio simulation package (VASP). More particularly, the formation energies of both intrinsic and extrinsic point defects, i.e. vacancies, interstitials, Frenkel pairs and Schottky trio defects, are calculated. Our results are compared with available experimental data and are also discussed in relation to previous calculations based on conventional functionals, such as the local spin-density approximation and generalized gradient approximations.