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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:
OSTI Identifier:
1247285
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