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Amorphous materials: Properties, structure, and durability

Structure of Mg- and Mg/Ca aluminosilicate glasses: ²⁷Al NMR and Raman spectroscopy investigations

¹ Physique des Minéraux et des Magmas, CNRS-IPGP, 4 place Jussieu, 75005 Paris
² IMPMC, Université Pierre et Marie Curie Paris 6, Université Denis Diderot, CNRS, IPGP, 140 rue de Lourmel, 75015 Paris, France
³ CNRS, UPR4212 CRMHT, 45071 Orléans cedex 2, France
⁴ Université d’Orléans, BP 6749, 45067 Orléans cedex 2, France

Correspondence: ^* E-mail: neuville{at}ipgp.jussieu.fr

The structure and properties of glasses and melts in the MgO-Al₂O₃-SiO₂ (MAS) and CaO-MgO-Al₂O₃-SiO₂ (CMAS) systems play an important role in Earth and material sciences. Aluminum has a crucial influence in these systems, and its environment is still questioned. In this paper, we present new results using Raman spectroscopy and ²⁷Al nuclear magnetic resonance on MAS and CMAS glasses. We propose an Al/Si tetrahedral distribution in the glass network in different Qⁿ species for silicon and essentially in Q⁴ and ^VAl for aluminum. For the CMAS glasses, an increase of ^VAl and ^VIAl is clearly visible as a function of the increase of Mg/Ca ratio in the (Ca,Mg)₃Al₂Si₃O₁₂ (garnet) and (Ca,Mg)AlSi₂O₈ (anorthite) glass compositions. In the MAS system, the proportion of ^VAl and ^VIAl increases with decreasing SiO₂ and, similarly with calcium aluminosilicate glasses, the maximum of ^VAl is located in the center of the ternary system.

Key Words: Aluminosilicate • glasses • NMR • Raman

This article has been cited by other articles:

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