Atomic scale analysis of defect clustering and predictions of their concentrations in UO2+x

Caglak, Emre; Govers, Kevin; Lamoen, D.; Labeau, Pierre-Etienne; Verwerft, Marc

doi:10.1016/j.jnucmat.2020.152403

Cited by 5 publications

(2 citation statements)

References 51 publications

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“…To some extent, they can create channels that allow the different species to diffuse with ease. Similarly to hypostoichiometry, a further increase in the deviation from stoichiometry can induce a stagnation (or even a decrease) in the diffusion coefficient due to the formation of extended defects, the most important being di-interstitial clusters (Wang et al, 2014;Brincat et al, 2015;Yu et al, 2015;Caglak et al, 2020).…”

Section: Oxygen/metal Ratio Oxygen Potential Points Defects Clusters ...mentioning

confidence: 99%

Cation interdiffusion in uranium–plutonium mixed oxide fuels: Where are we now?

Vauchy

Hirooka²,

Matsumoto³

et al. 2022

Front. Nucl. Eng.

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The diffusion phenomena in uranium–plutonium mixed oxides U1−yPuyO2 dictate the physicochemical properties of mixed oxides (MOX) nuclear fuel throughout manufacturing, irradiation, and storage. More precisely, it is paramount to estimate the cation interdiffusion insofar as it dovetails with the actinide redistribution during sintering and under irradiation. This paper draws a critical review of the existing experimental data of U and Pu interdiffusion coefficients in MOX fuel.

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Section: Oxygen/metal Ratio Oxygen Potential Points Defects Clusters ...mentioning

confidence: 99%

Cation interdiffusion in uranium–plutonium mixed oxide fuels: Where are we now?

Vauchy

Hirooka²,

Matsumoto³

et al. 2022

Front. Nucl. Eng.

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“…To clarify the features of oxygen diffusion at significant deviations of UO 2x from stoichiometry, computational simulation of this process is of interest. To date, such studies have been performed mainly for hyperstoichiometric UO 2 that contains excess oxygen [11][12][13][14]. Oxygendepleted hypostoichiometric uranium dioxide has been studied much less [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Diffusion of oxygen in hypostoichiometric uranium dioxide nanocrystals. A molecular dynamics simulation

et al. 2021

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A molecular dynamic simulation of diffusion of intrinsic oxygen anions in the bulk of hypostoichiometric UO2-x nanocrystals with a free surface was carried out. The main diffusion mechanism turned out to be the migration of oxygen by the anionic vacancies. It is shown that in the range of values of the non-stoichiometry parameter 0.05 £x £ 0.275 the oxygen diffusion coefficient D is weakly dependent on temperature, despite the uniform distribution of the vacancies over the model crystallite. The reliable D values calculated for the temperature T = 923 K are in the range from 3×10-9 to 7×10-8 cm2/s, in quantitative agreement with the experimental data. The corresponding diffusion activation energy is in the range from 0.57 eV to 0.65 eV, depending on the interaction potentials used for the calculations.

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Ultrafast diffusion of overpressurized gas filled nanobubbles in UO2

Antropov

Stegaĭlov

2021

Journal of Nuclear Materials

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Atomic scale analysis of defect clustering and predictions of their concentrations in UO2+x

Cited by 5 publications

References 51 publications

Cation interdiffusion in uranium–plutonium mixed oxide fuels: Where are we now?

Cation interdiffusion in uranium–plutonium mixed oxide fuels: Where are we now?

Diffusion of oxygen in hypostoichiometric uranium dioxide nanocrystals. A molecular dynamics simulation

Ultrafast diffusion of overpressurized gas filled nanobubbles in UO2

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