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Title: XPS Investigation on Changes in UO 2 Speciation following Exposure to Humidity

High purity UO 2powder 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. In addition, the relative abundance of O 2-, OH -, and H 2O was found to vary with exposure time. Therefore, 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.
Authors:
 [1] ;  [1] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-CONF-685861
Journal ID: ISSN 2059-8521; applab; PII: S2059852116002863
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
MRS Advances
Additional Journal Information:
Journal Volume: 1; Journal Issue: 44; Conference: Presented at: 2016 MRS Spring Meeting & Exhibit, Phoenix, AZ, United States, Mar 28 - Apr 01, 2016; Journal ID: ISSN 2059-8521
Publisher:
Materials Research Society (MRS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; actinide; x-ray photoelectron spectroscopy (XPS); surface chemistry
OSTI Identifier:
1247285

Donald, Scott B., Davisson, M. Lee, and Nelson, Art J.. XPS Investigation on Changes in UO2 Speciation following Exposure to Humidity. United States: N. p., Web. doi:10.1557/adv.2016.286.
Donald, Scott B., Davisson, M. Lee, & Nelson, Art J.. XPS Investigation on Changes in UO2 Speciation following Exposure to Humidity. United States. doi:10.1557/adv.2016.286.
Donald, Scott B., Davisson, M. Lee, and Nelson, Art J.. 2016. "XPS Investigation on Changes in UO2 Speciation following Exposure to Humidity". United States. doi:10.1557/adv.2016.286. https://www.osti.gov/servlets/purl/1247285.
@article{osti_1247285,
title = {XPS Investigation on Changes in UO2 Speciation following Exposure to Humidity},
author = {Donald, Scott B. and Davisson, M. Lee and Nelson, Art J.},
abstractNote = {High purity UO2powder 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. In addition, the relative abundance of O2-, OH-, and H2O was found to vary with exposure time. Therefore, 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.},
doi = {10.1557/adv.2016.286},
journal = {MRS Advances},
number = 44,
volume = 1,
place = {United States},
year = {2016},
month = {4}
}