Quantification of five- and six-coordinated aluminum ions in aluminosilicate and fluoride-containing glasses by high-field, high-resolution 27Al NMR

By J. Stebbins, S. Kroeker, Sung Keun Lee, T. J. Kiczenski. 2000

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A Review of Glass-Ionomer Cements for Clinical Dentistry (2016, background): “Aluminium has been shown to occur in both 4- and 5-co-ordination in various glasses [11,12], which confirms the effect of silica on the co-ordination state of aluminium [12].”
Al speciation and Ca environment in calcium aluminosilicate glasses and crystals by Al and Ca K-edge X-ray absorption spectroscopy. (2004, background): “The join R=1 (tectosilicates) has been particularly investigated since nonbridging oxygens and high coordinated Al ([5]Al and [6]Al) have been experimentally detected (Stebbins and Xu, 1997; Stebbins et al., 2000; Neuville et al., 2005), in contradiction with the simple picture based on composition.”
Letter. Aluminum coordination and the densification of high-pressure aluminosilicate glasses (2005, background): “This has also been observed in an ambi- ent pressure Na3AlSi7O17 glass (Allwardt et al. 2005a) as well as for several aluminosilicates with much lower NBO contents (Toplis et al. 2000; Stebbins et al. 2000; Neuville et al. 2004).”