Thermodynamic assessment of oxygen diffusion in non-stoichiometric UO2±x from experimental data and Frenkel pair modeling

被引：14

作者：

Berthinier, C. ^{[1
]}

Rado, C. ^{[1
]}

Chatillon, C. ^{[2
]}

Hodaj, F. ^{[2
]}

机构：

[1] CEA Marcoule, DEN DTEC SDTC LTAP, F-30207 Bagnols Sur Ceze, France

[2] UJF INP Grenoble, CNRS UMR 5266, Sci & Ingenierie Mat & Proc SIMAP, F-38402 St Martin Dheres, France

来源：

JOURNAL OF NUCLEAR MATERIALS | 2013年 / 433卷 / 1-3期

关键词：

O-U SYSTEM; SELF-DIFFUSION; CHEMICAL DIFFUSION; URANIUM-DIOXIDE; POINT-DEFECTS; OXIDES UO2+X; AUTODIFFUSION; COEFFICIENT; ENTHALPY; DURANIUM;

D O I：

10.1016/j.jnucmat.2012.09.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The self and chemical diffusion of oxygen in the non-stoichiometric domain of the UO2 compound is analyzed from the point of view of experimental determinations and modeling from Frenkel pair defects. The correlation between the self-diffusion and the chemical diffusion coefficients is analyzed using the Darken coefficient calculated from a thermodynamic description of the UO2 +/- x phase. This description was obtained from an optimization of thermodynamic and phase diagram data and modeling with different point defects, including the Frenkel pair point defects. The proposed diffusion coefficients correspond to the 300-2300 K temperature range and to the full composition range of the non stoichiometric UO2 compound. These values will be used for the simulation of the oxidation and ignition of the uranium carbide in different oxygen atmospheres that starts at temperatures as low as 400 K. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：265 / 286

页数：22

共 44 条

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