Relative impact of H 2 O and O 2 in the oxidation of UO 2 powders from 50 to 300 °C

Donald, Scott B.; Davisson, M. Lee; Dai, Zurong; Roberts, Sarah K.; Nelson, Art J.

doi:10.1016/j.jnucmat.2017.10.014

Title: Relative impact of H ₂ O and O ₂ in the oxidation of UO ₂ powders from 50 to 300 °C

Journal Article · Wed Oct 04 00:00:00 EDT 2017 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2017.10.014· OSTI ID:1416493

Donald, Scott B. ^[1]; Davisson, M. Lee ^[1];

^[1]; Roberts, Sarah K. ^[1];

^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, we studied the reaction of water and molecular oxygen with stoichiometric uranium dioxide (i.e. UO₂) powder at elevated temperature by high-resolution x-ray photoelectron spectroscopy (XPS), infrared (IR) spectroscopy, powder x-ray diffraction (XRD), and scanning electron microscopy (SEM). We observed and quatified oxidation resulting from the dissociative chemisorption of the adsorbing molecules and subsequent incorporation into the oxide lattice. Molecular oxygen was found to be a stronger oxidation agent than water at elevated temperatures but not at ambient.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

Grant/Contract Number:: AC52-07NA27344; LL15-U_Surface_Oxidation-NDD3B

OSTI ID:: 1416493

Alternate ID(s):: OSTI ID: 1549268

Report Number(s):: LLNL-JRNL-732898; TRN: US1800939

Journal Information:: Journal of Nuclear Materials, Vol. 496, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Relative impact of H ₂ O and O ₂ in the oxidation of UO ₂ powders from 50 to 300 °C