As in the case of BO3 and BO4 units in borate glasses or SiO4, SiO5 and SiO6 units found by molecular dynamics in densified silica glass, different structural units, such as AlO4, AlO5, and AlO6 have been observed in Al2O3 SiO2 glasses. 27Al Magic Angle Spin (MAS) NMR and molecular dynamics (MD) simulations have shown that alumina rich Al2O3 SiO2 glasses contain high quantities of distorted AlO5 species (about 30 49% of Al sites) apart from AlO4 and AlO632,33 http://www.raybansaler.com/,50,51. Moreover, based on oxygen diffusion in melts, it was suggested that AlO5 units in Al2O3 SiO2 glasses are trapped in the glass structure in a meta stable state between the AlO4 in liquids and AlO6 in crystalline materials like mullite33,51.
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