| Инд. авторы: | Kuryaeva R.G. |
| Заглавие: | Effect of pressure on the refractive index and relative density of the CaO · Al2O3 · 6SiO2 glass |
| Библ. ссылка: | Kuryaeva R.G. Effect of pressure on the refractive index and relative density of the CaO · Al2O3 · 6SiO2 glass // Journal of Non-Crystalline Solids. - 2009. - Vol.355. - Iss. 3. - P.159-163. - ISSN 0022-3093. |
| Внешние системы: | DOI: 10.1016/j.jnoncrysol.2008.11.020; SCOPUS: 2-s2.0-58349097323; |
| Реферат: | eng: The refractive index for glass of the CaO · Al2O3 · kh{cyrillic}SiO2 system with kh{cyrillic} = 6 in the range of pressures up to 6.0 GPa was measured using a polarization-interference microscope and an apparatus with diamond anvils. The changes in the relative density characterizing the compressibility of glass were estimated from the measured refractive indices within the framework of the theory of photoelasticity. The data were compared with the previous data for glasses of the same system with kh{cyrillic} = 2 and 4. The most compressible of the three glasses in the range 2.0-6.0 GPa was the CaO · Al2O3 · 6SiO2 glass. For glasses with kh{cyrillic} = 2, 4 and 6 we calculated the degrees of polymerization of silicon-aluminum-oxygen network, NBO/T (NBO - non-bridging oxygen), which are determined as the ratio of the number of gram-ions of non-bridging oxygen atoms to the total number of gram-ions of network formers. The structure-chemical parameter NBO/T was calculated with due regard for the formation of triclusters and highly coordinated aluminum. The degree of polymerization of the CaO · Al2O3 · kh{cyrillic}SiO2 glasses increases with increasing kh{cyrillic}, which agrees with the change of their relative density under pressure. © 2008 Elsevier B.V. All rights reserved.
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| Ключевые слова: | Under pressures; Short-range order; Relative densities; Natural glasses; Interference microscopes; Effect of pressures; Diamond anvils; Degrees of polymerizations; Degree of polymerizations; Chemical parameters; Bridging oxygens; Silicon compounds; Refractometers; Refractive index; Pressure effects; Polymers; Polymerization; Glass; Organic polymers; Optical properties; Monomers; Light refraction; Glass transition; Diamonds; Chemical reactions; Aluminum; Aluminosilicates; Alumina; Short-range order; Pressure effects; Optical properties; Natural glasses; Glass transition; Aluminosilicates; Oxygen; |
| Издано: | 2009 |
| Физ. характеристика: | с.159-163 |