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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Riebling, E.F. Depolymerization of GeO2 and GeO2 · Sb2O3 glasses by Bi2O3 . J Mater Sci 9, 753–760 (1974). https://doi.org/10.1007/BF00761795
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DOI: https://doi.org/10.1007/BF00761795