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XPS Investigation on Changes in UO2 Speciation following Exposure to Humidity

Published online by Cambridge University Press:  27 April 2016

Scott B. Donald
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
M. Lee Davisson
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
Art J. Nelson
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
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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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Copyright © Materials Research Society 2016 

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