UNSPECIFIED (2000) Improved ionic model of liquid uranium dioxide. In: International Conference on Strongly Coupled Coulomb Systems, SEP 04-10, 1999, ST MALO, FRANCE.

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Abstract

The paper presents a model for liquid uranium dioxide, obtained by improving a simplified ionic model, previously adopted to describe the equation of state of this substance [1]. A "chemical picture" is used for liquid UO2 of stoichiometric and non-stoichiometric composition. Several ionic species are considered here: U(+5), U(+4), U(+3), O(-2) and O(-1). The ions are described as charged hard-spheres of different diameters. Coulomb interaction of ions is taken into account according to the modified Mean Sphere Approximation The main result of the new model is the appearance of natural "plasma" equivalent, which, from the theory, is directly related to the definition of oxygen potential in liquid UO2+x. The features of the model make it possible to describe non-congruent phase equilibrium (and evaporation) in uranium dioxide, as well as other relevant phenomena characterising the phase equilibrium in chemically active matter. First calculation results are discussed.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL DE PHYSIQUE IV
Publisher:	E D P SCIENCES
ISSN:	1155-4339
Date:	March 2000
Volume:	10
Number:	P5
Number of Pages:	5
Page Range:	pp. 363-367
Publication Status:	Published
Title of Event:	International Conference on Strongly Coupled Coulomb Systems
Location of Event:	ST MALO, FRANCE
Date(s) of Event:	SEP 04-10, 1999
URI:	http://wrap.warwick.ac.uk/id/eprint/13390

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