Depolymerization of GeO2 and GeO2 · Sb2O3 glasses by Bi2O3 |
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Authors: | E. F. Riebling |
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Affiliation: | 1. Institute of Polymer Science, University of Akron, Akron, Ohio, USA
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Abstract: | Glasses that contain at least 60 mol% GeO2 were prepared in the Bi2O3 · GeO2 and Bi2O3 · Sb2O3 · GeO2 systems. Their densities, refractive indices, and infra-red spectra were recorded. Negative molar volume deviations and positive refraction deviations occur for all of the binary glasses. These create deviations for the 60 to 80 mol % GeO2 ternary glasses that indicate non-ideal mixing when Sb3+ substitutes for Bi3+. Also, the main Ge-O stretching vibration shifts to as low as 695 cm?1 for the Bi2O3-rich binary and ternary glasses. All of these findings show that Bi2O3 more effectively depolymerizes GeO2 than does Sb2O3. The probable structural reasons for this behaviour are discussed. |
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