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Non-bridging oxygen and high-coordinated aluminum in metaluminous and peraluminous calcium and potassium aluminosilicate glasses: High-resolution 17O and 27Al MAS NMR results
-
Linda M. Thompson
and
Jonathan F. Stebbins
Published/Copyright:
April 2, 2015
Abstract
Change in configuration and structure with composition are important components of thermodynamic and transport properties of most aluminosilicate melts, but the complex interactions, particularly in metaluminous and peraluminous compositions, are not yet well understood. In this paper, we present high-resolution 27Al and 17O MAS and 3QMAS NMR data on several calcium and potassium aluminosilicate glasses prepared at several SiO2 isopleths, ranging from peralkaline to peraluminous compositions. In all calcium aluminosilicate glasses, the VAl content increases with increasing Al content, while the NBO content decreases (in one series, below the limit of detection), consistent with other recent NMR studies of calcium aluminosilicate glasses. An increase in VAl content per total Al is also observed as the glass approaches the calcia-silica binary. In the potassium aluminosilicate glasses, NBO is directly quantified for the first time in metaluminous and peraluminous compositions; VAl is below the detection limit. We discuss possible mechanisms for the incorporation of alumina into the melt structure and show how changes in the VAl content as a function of composition may be used to eliminate mechanisms that do not fit the observed data. We also explore reactions, which show the difficulty of explaining the NBO present on the metaluminous join with only the observed VAl, implying the necessity of multiple reactions producing NBO in such compositions.
Keywords: Aluminosilicate glasses; non-bridging oxygen; high-coordinated aluminum; NMR spectroscopy; oxygen-17; aluminum-27
Received: 2010-8-27
Accepted: 2011-1-6
Published Online: 2015-4-2
Published in Print: 2011-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Aluminosilicate glasses;
non-bridging oxygen;
high-coordinated aluminum;
NMR spectroscopy;
oxygen-17;
aluminum-27
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