Structural analysis of Bi₂O₃-B₂O₃-based low-melting glasses

Abstract

Glass structure of low-melting Bi₂O₃-ZnO-B₂O₃ glasses was investigated, in which the coordination numbers of B and Bi atoms were estimated by using 11B MAS NMR and X-ray diffraction techniques, respectively. For the glasses with a constant ZnO content, the average coordination numbers of B and Bi commonly decreased with increasing Bi₂O₃ content, suggesting that Bi atoms acted as NWF forming Bi-O-Bi and Bi-O-B bridges. The structural changes observed in the present glasses are similar to the case confirmed in PbO-B₂O₃ glasses.