Low-temperature oxidation of fine UO2 powders: thermochemistry and kinetics

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Low-temperature oxidation of fine UO2 powders: thermochemistry and kinetics. / Leinders, Gregory; Cardinaels, Thomas; Binnemans, Koen; Verwerft, Marc.

In: Inorganic Chemistry, Vol. 57, 22.03.2018, p. 4196-4204.

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@article{fb1245ae7e964a0c9316d951dd207f4b,
title = "Low-temperature oxidation of fine UO2 powders: thermochemistry and kinetics",
abstract = "The thermochemical behavior of low-temperature oxidation in fine UO2 powders has been investigated by simultaneous thermogravimetric analysis and differential scanning calorimetry. Evaluation of the thermochemical and kinetic data reveals a complex interplay between different mechanisms. The initial reaction concerns the rapid chemisorption of oxygen gas onto the surface of UO2 grains, having an activation energy of only 13.1 ± 0.6 kJ mol−1. Subsequent oxidation at temperatures between 40 °C and 100 °C occurs first at the surface via a field-assisted mechanism, which progresses via domain growth into the bulk. At more elevated temperatures thermally activated diffusion becomes the dominant mechanism.",
keywords = "low temperature, owydation, UO2, powders, Themochemistry, Kinetics",
author = "Gregory Leinders and Thomas Cardinaels and Koen Binnemans and Marc Verwerft",
note = "Score=10",
year = "2018",
month = "3",
day = "22",
doi = "10.1021/acs.inorgchem.8b00517",
language = "English",
volume = "57",
pages = "4196--4204",
journal = "Inorganic Chemistry",
issn = "0020-1669",
publisher = "ACS - American Chemical Society",

}

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TY - JOUR

T1 - Low-temperature oxidation of fine UO2 powders: thermochemistry and kinetics

AU - Leinders, Gregory

AU - Cardinaels, Thomas

AU - Binnemans, Koen

AU - Verwerft, Marc

N1 - Score=10

PY - 2018/3/22

Y1 - 2018/3/22

N2 - The thermochemical behavior of low-temperature oxidation in fine UO2 powders has been investigated by simultaneous thermogravimetric analysis and differential scanning calorimetry. Evaluation of the thermochemical and kinetic data reveals a complex interplay between different mechanisms. The initial reaction concerns the rapid chemisorption of oxygen gas onto the surface of UO2 grains, having an activation energy of only 13.1 ± 0.6 kJ mol−1. Subsequent oxidation at temperatures between 40 °C and 100 °C occurs first at the surface via a field-assisted mechanism, which progresses via domain growth into the bulk. At more elevated temperatures thermally activated diffusion becomes the dominant mechanism.

AB - The thermochemical behavior of low-temperature oxidation in fine UO2 powders has been investigated by simultaneous thermogravimetric analysis and differential scanning calorimetry. Evaluation of the thermochemical and kinetic data reveals a complex interplay between different mechanisms. The initial reaction concerns the rapid chemisorption of oxygen gas onto the surface of UO2 grains, having an activation energy of only 13.1 ± 0.6 kJ mol−1. Subsequent oxidation at temperatures between 40 °C and 100 °C occurs first at the surface via a field-assisted mechanism, which progresses via domain growth into the bulk. At more elevated temperatures thermally activated diffusion becomes the dominant mechanism.

KW - low temperature

KW - owydation

KW - UO2

KW - powders

KW - Themochemistry

KW - Kinetics

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/29417044

U2 - 10.1021/acs.inorgchem.8b00517

DO - 10.1021/acs.inorgchem.8b00517

M3 - Article

VL - 57

SP - 4196

EP - 4204

JO - Inorganic Chemistry

JF - Inorganic Chemistry

SN - 0020-1669

ER -

ID: 4095218