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Title: Defect disorder in UO{sub 2}

A defect disorder model has been developed to determine equilibrium off-stoichiometry and its spatial variations in UO{sub 2} crystals. The model gives the concentrations of atomic defects and electronic carriers as functions of oxygen partial pressure and temperature in the bulk and near crystal surfaces subject to an oxygen environment. Energetic parameters from published density functional theory calculations have been integrated into the defect disorder model for an accurate determination of the defect density and off-stoichiometry. The ionosorption theory has been used to couple the oxygen environment with the defect state in the crystal as we solved for the defect disorder near crystal surfaces. Contrary to the common belief that hyper-stoichiometry of UO{sub 2} is dominated by oxygen interstitials, the current model predicts that this regime is rather dominated by uranium vacancies. The model predictions also show that, in the presence of surfaces, the point defect concentrations vary by orders of magnitude in the subsurface region relative to the bulk region. Highlights: • Defect disorder in bulk UO2+x is modeled in terms of temperature and oxygen pressure. • The densities of atomic defects and electronic charge carriers are determined. • The model is extended to study the heterogeneity of defectmore » density near crystal surfaces. • The surface effect is modeled using ionosorption theory. • The dominant defect type and off-stoichiometry profile near surface are found.« less
Authors:
 [1] ;  [1] ; ;  [2]
  1. School of Nuclear Engineering, Purdue University, West Lafayette, IN 47904 (United States)
  2. Nuclear Engineering and Engineering Physics, University of Wisconsin, Madison, WI 53706 (United States)
Publication Date:
OSTI Identifier:
22274030
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 204; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CHARGE CARRIERS; CRYSTALS; DENSITY; DENSITY FUNCTIONAL METHOD; INTERSTITIALS; OXYGEN; PARTIAL PRESSURE; SURFACES; URANIUM DIOXIDE