Tin valence and local environments in silicate glasses as determined from X-ray absorption spectroscopy

X-ray absorption spectroscopy (XAS) was used to characterize the tin (Sn) environments in four borosilicate glass nuclear waste formulations, two silicate float glasses, and three potassium aluminosilicate glasses. Sn K-edge XAS data of most glasses investigated indicate Sn4+O6 units with average Sn...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2008-06, Vol.354 (27), p.3142-3151
Main Authors: McKeown, David A., Buechele, Andrew C., Gan, Hao, Pegg, Ian L.
Format: Article
Language:English
Subjects:
Absorption
ABSORPTION SPECTROSCOPY
BOROSILICATE GLASS
Borosilicates
Condensed matter: structure, mechanical and thermal properties
Disordered solids
Exact sciences and technology
GLASS
Glasses
MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
MIXTURES
national synchrotron light source
Nuclear and chemical wastes
Oxide glasses
Physics
POTASSIUM
RADIOACTIVE WASTES
SILICATES
Structure of solids and liquids
crystallography
TIN
VALENCE
WASTES
X-RAY SPECTROSCOPY
X-rays
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Summary:X-ray absorption spectroscopy (XAS) was used to characterize the tin (Sn) environments in four borosilicate glass nuclear waste formulations, two silicate float glasses, and three potassium aluminosilicate glasses. Sn K-edge XAS data of most glasses investigated indicate Sn4+O6 units with average Sn–O distances near 2.03Å. XAS data for a float glass fabricated under reducing conditions show a mixture of Sn4+O6 and Sn2+O4 sites. XAS data for three glasses indicate Sn–Sn distances ranging from 3.43 to 3.53Å, that suggest Sn4+O6 units linking with each other, while the 4.96Å Sn–Sn distance for one waste glass suggests clustering of unlinked Sn4+O6 units.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2008.01.019