High Resolution Nmr Studies Of Borate Glass Structure

A combination of nuclear magnetic resonance techniques are used to study the short and intermediate range structure of boron oxide glass and potassium borate glasses. It is inferred that intermediate range order in boron oxide glass arises from a propensity for boroxol rings to aggregate, making clusters with a typical size of 20-40 A. As the glass is modified with potassium oxide it is shown that the modification occurs at both boroxol ring and non-ring sites, and a model is proposed that combines both NMR and Raman spectroscopic observations of the structural changes.