Raman Spectroscopy of Heat-Treated B2O3-SiO2 Glasses |
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Authors: | TOSHIHARU FURUKAWA WILLIAM B. WHITE |
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Affiliation: | Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802 |
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Abstract: | Raman spectra were measured on B2O3-SiO2 glasses heat-treated at different temperatures and for different periods of time. It was found that the intensity ratio of the 810- and 475-cm−1 bands depended on the thermal history and composition of glass. The intensity vs heat-treatment temperature curve exhibited a maximum in the glass-transition temperature range. High-temperature Raman spectra were measured on 0.5B2O3-0.5SiO2 glass, both with increasing and decreasing temperature, between room temperature and 600°C. Above 300°C with increasing temperature, the intensity of the 810-cm−1 band decreased, whereas the intensity of the 475-cm−1 band increased. The changes reversed with decreasing temperature. The reversible change of the intensity of the two bands was interpreted as a reversible formation and decomposition of boroxy rings with temperature. The reaction becomes very sluggish below the glass transition so that the intensity ratio stayed constant below 300°C. |
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