Thermodynamic model of the oxidation of Ln-doped UO2

被引：3
|
作者：
Vinograd, V. L. [1 ]
Bukaemskiy, A. A. [1 ]
Deissmann, G. [1 ]
Modolo, G. [1 ]
机构：
[1] Forschungszentrum Julich GmbH, Inst Energy & Climate Res Nucl Waste Management IE, Julich, Germany
来源：
SCIENTIFIC REPORTS | 2023年 / 13卷 / 01期
关键词：
SOLID-SOLUTIONS; LATTICE-PARAMETER; FISSION-PRODUCTS; PHASE-RELATIONSHIPS; MIXED OXIDES; SYSTEM; ND; LA; REACTIVITY; ENERGETICS;
D O I：
10.1038/s41598-023-42616-x
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Ln-doped UO2 is often considered as a model system of spent nuclear fuel (SNF) helping to reveal effects of fission and activation products on its chemical stability. Comparing thermodynamics of UO2-UO3 and LnO(1.5)-UO2-UO(3 )systems provides a means to understand the phenomenon of an increased resistivity of Ln-doped UO2 to oxidation in air relative to pure UO2. Here a thermodynamic model is developed and is applied to investigate detailed phase changes occurring along the oxidation of Ln-doped fluorite to U3O8. The study proposes that an enhanced resistivity to oxidation of Ln-doped UO2 is likely caused by a thermodynamically driven partitioning of Ln between a fluorite-type phase and a U3O8 polymorph, which at ambient temperatures becomes hindered by slow diffusion.
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页数：15
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