Glancing-angle x-ray absorption spectroscopy of corroded borosilicate glass surfaces containing uranium

Journal Article · Wed Jun 07 04:00:00 EDT 1989 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00194a024· OSTI ID:6971100

Greaves, G N; Steel, A ^[1]; Barrett, N T; Thornley, F R ^[2]; Antonini, G M ^[3]; Willis, B T.M. ^[4]

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1. SERC Daresbury Lab., Warrington (England)
2. Univ. of Strathclyde, Glasgow (England)
3. Universita di Modena (Italy)
4. Chemical Crystallography Lab., Oxford (England)

The local atomic structure surrounding uranium in borosilicate glass has been investigated by fluorescence x-ray absorption spectroscopy. By employing angles of incidence either side of the critical angle for total external reflection, surface and near-surface structure can be distinguished. The results of leaching in water at 100{degree}C have been examined in detail. Wet and dried glass surfaces can be differentiated. Analysis of glancing-angle spectra demonstrates that uranium occupies a uranyl-like environment that hydrates as leaching progresses. Uranyl complexing occurs in a planar geometry. The initial corrosion process can be readily understood by using the modified random network model for glass structure, which predicts diffusion of cations and water taking place via percolation pathways through the network. Following extended corrosion treatment, evidence for the formation of hydrated uranyl silicates that the surface has been found.

• OSTI ID: 6971100
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 111:12; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

052000 -- Nuclear Fuels-- Waste Management
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
ACTINIDES
BOROSILICATE GLASS
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
GLASS
INFORMATION
MANAGEMENT
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
RADIOACTIVE WASTE STORAGE
SPECTROSCOPY
STORAGE
URANIUM
WASTE MANAGEMENT
WASTE STORAGE
X-RAY SPECTROSCOPY