Uranium oxidation kinetics monitored by in-situ X-ray diffraction

S. Zalkind; G. Rafailov; I. Halevy; T. Livneh; A. Rubin; H. Maimon; D. Schweke

doi:10.1016/j.jnucmat.2016.12.021

Uranium oxidation kinetics monitored by in-situ X-ray diffraction

S. Zalkind, G. Rafailov, I. Halevy, T. Livneh, A. Rubin, H. Maimon, D. Schweke

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16 Scopus citations

Abstract

The oxidation kinetics of U-0.1 wt%Cr at oxygen pressures of 150 Torr and the temperature range of 90–150 °C was studied by means of in-situ X-ray diffraction (XRD). A “breakaway” in the oxidation kinetics is found at ∼0.25 μm, turning from a parabolic to a linear rate law. At the initial stage of oxidation the growth plane of UO₂(111) is the prominent one. As the oxide thickens, the growth rate of UO₂(220) plane increases and both planes grow concurrently. The activation energies obtained for the oxide growth are Q_parabolic = 17.5 kcal/mol and Q_linear = 19 kcal/mol. Enhanced oxidation around uranium carbide (UC) inclusions is clearly observed by scanning electron microscopy (SEM).

Original language	English
Pages (from-to)	202-206
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	485
DOIs	https://doi.org/10.1016/j.jnucmat.2016.12.021
State	Published - 1 Mar 2017
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Materials Science (all)
Nuclear Energy and Engineering

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10.1016/j.jnucmat.2016.12.021

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title = "Uranium oxidation kinetics monitored by in-situ X-ray diffraction",

abstract = "The oxidation kinetics of U-0.1 wt%Cr at oxygen pressures of 150 Torr and the temperature range of 90–150 °C was studied by means of in-situ X-ray diffraction (XRD). A “breakaway” in the oxidation kinetics is found at ∼0.25 μm, turning from a parabolic to a linear rate law. At the initial stage of oxidation the growth plane of UO2(111) is the prominent one. As the oxide thickens, the growth rate of UO2(220) plane increases and both planes grow concurrently. The activation energies obtained for the oxide growth are Qparabolic = 17.5 kcal/mol and Qlinear = 19 kcal/mol. Enhanced oxidation around uranium carbide (UC) inclusions is clearly observed by scanning electron microscopy (SEM).",

author = "S. Zalkind and G. Rafailov and I. Halevy and T. Livneh and A. Rubin and H. Maimon and D. Schweke",

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T1 - Uranium oxidation kinetics monitored by in-situ X-ray diffraction

AU - Zalkind, S.

AU - Rafailov, G.

AU - Halevy, I.

AU - Livneh, T.

AU - Rubin, A.

AU - Maimon, H.

AU - Schweke, D.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - The oxidation kinetics of U-0.1 wt%Cr at oxygen pressures of 150 Torr and the temperature range of 90–150 °C was studied by means of in-situ X-ray diffraction (XRD). A “breakaway” in the oxidation kinetics is found at ∼0.25 μm, turning from a parabolic to a linear rate law. At the initial stage of oxidation the growth plane of UO2(111) is the prominent one. As the oxide thickens, the growth rate of UO2(220) plane increases and both planes grow concurrently. The activation energies obtained for the oxide growth are Qparabolic = 17.5 kcal/mol and Qlinear = 19 kcal/mol. Enhanced oxidation around uranium carbide (UC) inclusions is clearly observed by scanning electron microscopy (SEM).

AB - The oxidation kinetics of U-0.1 wt%Cr at oxygen pressures of 150 Torr and the temperature range of 90–150 °C was studied by means of in-situ X-ray diffraction (XRD). A “breakaway” in the oxidation kinetics is found at ∼0.25 μm, turning from a parabolic to a linear rate law. At the initial stage of oxidation the growth plane of UO2(111) is the prominent one. As the oxide thickens, the growth rate of UO2(220) plane increases and both planes grow concurrently. The activation energies obtained for the oxide growth are Qparabolic = 17.5 kcal/mol and Qlinear = 19 kcal/mol. Enhanced oxidation around uranium carbide (UC) inclusions is clearly observed by scanning electron microscopy (SEM).

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DO - 10.1016/j.jnucmat.2016.12.021

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Uranium oxidation kinetics monitored by in-situ X-ray diffraction

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