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Journal Articles Journal of the American Ceramic Society Year : 2021

Impact of magnesium on the structure of aluminoborosilicate glasses: A solid‐state NMR and Raman spectroscopy study

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Abstract

Seven magnesium-containing aluminoborosilicate glasses, with three to five oxides, have been studied through comprehensive multi-nuclear solid-state NMR (11B, 27Al, 29Si, 23Na, 17O and 25Mg) and Raman spectroscopy. The progressive addition of cations and the substitution of sodium and calcium by magnesium illuminate the impact of magnesium on the glass structure. The proportion of tri-coordinated boron drastically increased with magnesium addition, demonstrating the poor charge-compensating capabilities of magnesium in tetrahedral boron units. Oxygen-17NMR showed the formation of mixing sites containing both Na and Mg near non-bridging oxygen sites. Furthermore, a high magnesium content appears to result in the formation of two sub-networks (boron and silicon rich) with different polymerization degrees as well as to promote the formation of high-coordination aluminium sites (Al[V] and Al[VI]). Finally, magnesium coordination ranging from four to six, with a mean value shifting from five to six along the series, suggests that magnesium might endorse an intermediate role in these glasses.
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Dates and versions

cea-03211757 , version 1 (30-04-2021)

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Nicolas Bisbrouck, Marco Bertani, Frédéric Angeli, Thibault Charpentier, Dominique de Ligny, et al.. Impact of magnesium on the structure of aluminoborosilicate glasses: A solid‐state NMR and Raman spectroscopy study. Journal of the American Ceramic Society, In press, 104 (9), pp.4518-4536. ⟨10.1111/jace.17876⟩. ⟨cea-03211757⟩
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