Properties and Structure of Glasses in the System Bi2O3-SiO2-GeO2 |
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Authors: | J A TOPPING N CAMERON M K MURTHY |
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Affiliation: | Department of Materials Chemistry, Ontario Research Foundation, Sheridan Park, Ontario, Canada |
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Abstract: | In the system Bi2O3-SiO2-GeO2, good glasses can be formed only from limited compositional regions consisting of 2 narrow strips along the lines x Bi2O3-(100-:t) GeO2 ( x ≤40) and 40Bi2O3 y SiO2 (60- y )GeO2 (mol%); such glass is dark brown. Compositions from a large region (Bi2O3 content <40 mol%) showed immiscibility. In the binary system Bi2O3-GeO2, density and refractive index vary linearly with composition (mol%). Negative deviations of molar volume from ideality suggest that the coordination of a significant number of Ge ions is changing from 4-fold to 6-fold. Thermal expansion and electrical resistivity data are also reported. |
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