A defect structure study of nonstoichiometric uranium dioxide by statistical-mechanical models

In order to clarify the defect structure of UO 2 + x two types of defect clusters, the 2:2:2 cluster and the cuboctahedral cluster, are explored by comparing the oxygen potential and the partial molar enthalpy of oxygen calculated from the statistical-mechanical model formulated for each cluster wit...

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Bibliographic Details
Published in:Journal of nuclear materials 1994-03, Vol.209 (1), p.79-91
Main Author: Iwano, Yoshihiko
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Defects and impurities in crystals
microstructure
Exact sciences and technology
Physics
Structure of solids and liquids
crystallography
Theories and models of crystal defects
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Summary:In order to clarify the defect structure of UO 2 + x two types of defect clusters, the 2:2:2 cluster and the cuboctahedral cluster, are explored by comparing the oxygen potential and the partial molar enthalpy of oxygen calculated from the statistical-mechanical model formulated for each cluster with the measured ones. The model for the cuboctahedral clusters in equilibrium between various charge states gives good agreements with both the oxygen potential and the partial molar enthalpy of oxygen, whereas the models of the clusters which assume a single charge state do not.
ISSN:0022-3115
1873-4820
DOI:10.1016/0022-3115(94)90249-6