Nuclear magnetic resonance studies of the glasses in the system PbO–B2O3–SiO2

Abstract

The ¹¹B and ²⁰⁷Pb NMR spectra have been used to study the structure of glasses in the system PbO–B₂O₃–SiO₂. The results indicate that the glasses do not contain an appreciable number of BO⁻₃ units, and the network‐forming lead atoms play an important role in the compositional behavior of N₄ (the fraction of boron atoms in BO₄ units). The measured values of N₄ are analyzed according to a simplified theoretical equation. It is concluded from the N₄ analysis that the Pb⁺² ions are shared almost evenly between the boron–oxygen and silicon–oxygen networks.