Refractive index and density of alkali lime borogermanosilicate glasses
| Autor: | G. A. C. M. Spierings, G. P. Melis |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
chemistry.chemical_classification
Materials science Borosilicate glass Mechanical Engineering Analytical chemistry Mineralogy chemistry.chemical_element Germanium Polymer Alkali metal chemistry Octahedron Mechanics of Materials Refraction (metallurgy) General Materials Science Boron Refractive index |
| Zdroj: | Journal of Materials Science. 16:1059-1062 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/bf00542752 |
| Popis: | Refractive index and density data of glasses having molar compositions 15% A2O-10% CaO-45% SiO2-(30−x%) GeO2-x% B2O3 with A=Na or K are reported. From these data the molar refraction and the contribution of oxygen to the molar refraction are calculated. The co-ordination of germanium and boron in these glasses is discussed. At x=0, GeO6 octahedra are observed which are gradually transformed into GeO4 tetra-hedra as the GeO2 is replaced by B2O3. In B2O3-rich glasses no GeO6 octahedra are present and the structure of the B2O3-rich glasses is found to be the same as that of comparable alkali borosilicate glasses. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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