Abstract
The role of alkali metal cations in determining the structure of binary silicate glasses has been studied by magic angle spinning NMR of 29Si and 133Cs in Rb 2OSiO 2 and Cs 2OSiO 2. Glasses with up to ≈ to mol% alkali metal oxide have been investigated and the results compared with those for Li 2OSiO 2 and Na 2OSiO 2. At high concentrations of Rb 2O or Cs 2O there is a deviation from the formation of solely Q n and Q n−1 species which was found for Na 2OSiO 2. We suggest that the structure of binary silicates is determined by a balance between the repulsion of non-bridging oxygens on different Q species and the mutual attraction or repulsion of the alkali metal cations.
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