Raman and IR Spectroscopy of Na2O–SiO2–GeO2 System

Abstract

Germanosilicate glasses of compositions (mol%): $$(100 - {\text{x)(33Na}}_{2} {\text{O}} \cdot 6 7 {\text{SiO}}_{2} ) \cdot {\text{xGeO}}_{2},$$ where x = 20, 25, 30, 35 and 40 were studied using Raman and IR spectroscopy. Structural units existing in glasses were determined. The transition of silicon-containing anionic sheet structures to three-dimensional network with the formation of Si–O–Si bridge atoms was observed when germanium oxide was added to sodium disilicate.