Coffinite formation from UO2+x.

Scientific Reports
Stephanie SzenknectRodney C Ewing

Abstract

Most of the highly radioactive spent nuclear fuel (SNF) around the world is destined for final disposal in deep-mined geological repositories. At the end of the fuel's useful life in a reactor, about 96% of the SNF is still UO2. Thus, the behaviour of UO2 in SNF must be understood and evaluated under the weathering conditions of geologic disposal, which extend to periods of hundreds of thousands of years. There is ample evidence from nature that many uranium deposits have experienced conditions for which the formation of coffinite, USiO4, has been favoured over uraninite, UO2+x, during subsequent alteration events. Thus, coffinite is an important alteration product of the UO2 in SNF. Here, we present the first evidence of the formation of coffinite on the surface of UO2 at the time scale of laboratory experiments in a solution saturated with respect to amorphous silica at pH = 9, room temperature and under anoxic conditions.

References

Nov 10, 2012·Inorganic Chemistry·Kate MaherGordon E Brown
Dec 3, 2013·Environmental Science & Technology·Sabrina LabsDirk Bosbach
Feb 24, 2015·Nature Materials·Rodney C Ewing
May 13, 2015·Proceedings of the National Academy of Sciences of the United States of America·Xiaofeng GuoAlexandra Navrotsky
Jul 7, 2015·Inorganic Chemistry·Adel MesbahNicolas Dacheux
May 2, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Paul EstevenonNicolas Dacheux

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Citations

Jan 23, 2021·Proceedings of the National Academy of Sciences of the United States of America·Pierre LefebvreGuillaume Morin
Jun 30, 2021·Inorganic Chemistry·Gregory LeindersMarc Verwerft

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Methods Mentioned

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X-ray
scanning electron microscopy
High Resolution Transmission Electron Microscopy
electron diffraction
chips

Software Mentioned

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GibbsStudio
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FiJi
DigitalMicrograph
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