Alkali alumino-silicate glasses

The simulations strongly indicate, that, in alkali alumino-silicate glasses. Si is preferentially bonded to NBO, whilst A1 is preferentially bonded to BO and TBO. Indeed, this feature is quite clear when the structure is visualized. 

As seen in Fig. 15, in either the mixed-alkali silicate or mixed-alkali alumino-silicate glasses, clearly distinguishable Li-O and Na-O PDF peaks and coordination shells are observed, indicating that Li and Na ions adopt distinctly separate environments in there glasses, in accordance with the defect model proposed by LaCourse[83],... 

R. Dupree, D. Holland, M. G. Mortuza, J. A. Collins and M. W. G. Lochyer, Magic Angle Spuming NMR of Alkali Phospho-Alumino-Silicate Glasses, J. Non-Cryst. Solids, 112, 111-119 (1989). 

Studies regarding the reactions between sodium carbonate and potassium carbonate vapors and refractories have been limited in scope. (Many studies conducted by industry may not have been reported in the literature.) The majority have involved the examination of the degenerated features of refractories after an average service campaign. Most of the articles published have concerned the reactions between alkalies and alumino-silicate refractories utilized in glass melting and blast furnaces. 

---