Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 352, Issue 1-3, Pages 144-150Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2006.02.048
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By means of an ab initio plane wave pseudopotential method, the behavior of helium in UO2, PuO2, AmO2, and (Am0.5Pu0.5)O-2 and of xenon in UO2, is studied. We first show that a pseudopotential approach in the generalized gradient approximation (GGA) can satisfactorily describe the cohesive properties of these actinide dioxides. We then calculate the formation energies of point defects (vacancies and interstitials), as well as the incorporation and solution energies of helium in UO2, PuO2, AmO2 and (Am0.5Pu0.5)O-2, and of xenon in UO2. The results are discussed according to the incorporation site of the gas atom in the fluorite lattice and according to the dioxide stoichiometry. (c) 2006 Elsevier B.V. All rights reserved.
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