Improved ionic model of liquid uranium dioxide

被引:4
|
作者
Gryaznov, V [1 ]
Iosilevski, I
Yakub, E
Fortov, V
Hyland, GJ
Ronchi, C
机构
[1] Russian Acad Sci, Inst Chem Phys, Chernogolovka 142432, Russia
[2] State Univ, Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Reg, Russia
[3] Odessa II Mechnikov State Univ, UA-270014 Odessa, Ukraine
[4] RAS, High Energy Dens Res Ctr, Moscow 127412, Russia
[5] Univ Warwick, Coventry CV4 7AL, W Midlands, England
[6] Commiss European Communities, Joint Res Ctr, European Inst Transuranium Elements, D-7500 Karlsruhe, Germany
来源
JOURNAL DE PHYSIQUE IV | 2000年 / 10卷 / P5期
关键词
D O I
10.1051/jp4:2000569
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
引用
收藏
页码:363 / 367
页数:5
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