Raman spectroscopic investigation of sodium borosilicate glass structure
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Raman spectra of sodium borosilicate glasses with a wide range of Na2O/B2O3 ratios were systematically measured. Variations of the spectra with glass composition were studied to interpret the implied distribution of Na+ ions between silicate and borate units. When Na2O/B2O3 is less than 1, all Na+ ions are associated with borate units as indicated by the absence of the 1100 cm−1 band of Si-O− non-bridging bond stretching. For the (1−x)Na2O · SiO2 ·xB2O3 glass withx≦0.4 the peak-height ratio of the 950 cm−1 band to the 1080 cm−1 band was used to analyse semiquantitatively the distribution of the Na+ ions between silicate and borate units. Sodium ions are divided between silicate and borate units approximately in proportion to the amount of SiO2 and B2O3 present in these glasses. Some of the high sodium content glasses were crystallized and their spectra were compared with the bulk glass spectra. The distribution of Na+ ions in the glass was quite different from their distribution after crystallization. Spectra of high silica glasses that had been heat-treated for phase separation indicated exclusion of borate units from the silica network and the formation of borate groups. For high boron content glasses, no change was observed on heat treatment. Raman bands due to borate groups seem to be little affected by their environments.
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- Raman spectroscopic investigation of sodium borosilicate glass structure
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Volume 16, Issue 10 , pp 2689-2700
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