Abstract
The Raman spectra of borosilicate glass containing 35, 40, and 45 mol % of alkali-earth metal oxide (SrO and BaO) are studied. The structural changes taking place at a gradual substitution of boron oxide by silica are determined. At a high boron oxide content, transformations among borate structural units are predominant because the main part of the modifying oxide reacts with the borate network. When boron is replaced by silicon, the appearance of borosilicate ring structures is observed in alkali-earth borosilicate glass. At the ratio of SiO2/B2O3 > 0.5, a part of the triborate groups and borate structural units containing nonbridging oxygen atoms decreases gradually. When SiO2/B2O3 > 1, the character of the transformations among the Q n structural units changes.
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