Abstract
High purity UO2 powder samples were subjected to accelerated aging under controlled conditions with relative humidity ranging from 34% to 98%. Characterization of the chemical speciation of the products was accomplished using X-ray photoelectron spectroscopy (XPS). A shift to higher uranium oxidation states was found to be directly correlated to increased relative humidity exposure. Additionally, the relative abundance of O2-, OH-, and H2O was found to vary with exposure time. Thus, it is expected that uranium oxide materials exposed to high relative humidity conditions during processing and storage would display a similar increase in average uranium valence.
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Donald, S.B., Davisson, M.L. & Nelson, A.J. XPS Investigation on Changes in UO2 Speciation following Exposure to Humidity. MRS Advances 1, 2993–2997 (2016). https://doi.org/10.1557/adv.2016.286
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DOI: https://doi.org/10.1557/adv.2016.286