Abstract
The glass-forming region was determined by the water quenching method in the system Na2O-Ga2O3-B2O3. Raman spectra were measured for glasses in the composition range 10-40mol% Na2O, 0-30mol% Ga2O3 and 30-90mol% B2O3. The Raman spectroscopic study revealed that, at a given Ga2O3 concentration, an increase in Na2O content causes changes in boron coordination in the sequence BO3→BO4→BO3, while for a given Na2O concentration an increase in Ga2O3 content reduces the BO4 concentration in the Na2O-Ga2O3-B2O3 glass. Change in coordination number of gallium from 6 to 4 was deduced from the Raman spactra. The compositional dependence of density and refractive index consistent with the deduced structural changes in glass.
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