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dc.contributor.author Neuville D.R.
dc.date.accessioned 2024-09-04T09:55:37Z
dc.date.available 2024-09-04T09:55:37Z
dc.date.issued 2006
dc.identifier https://www.elibrary.ru/item.asp?id=31404447
dc.identifier.citation Chemical Geology, 2006, 229, 1-3, 28-41
dc.identifier.issn 0009-2541
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/44919
dc.description.abstract Configurational entropy has been linked with the structure of Na2O-CaO-SiO2 melts, based on combined viscosimetry and Raman spectroscopic investigations. From viscosity measurements at low and high temperatures, we have obtained the configurational entropy, Sconf (using log η = Ae + Be / TSconf, where η is the viscosity, T the temperature and Ae, Be two constants). Using Raman spectroscopy, we obtained structural information from the Q speciation and from the variation of the boson peak with chemical composition. A rapid decrease in the viscosity at low temperature was observed in Ca-silicate melts with addition of Na2O. At high temperature, the viscosity is almost the same for the Ca- and Na-silicate liquids. The configurational entropy calculated from the viscosity measurements for Ca/Na mixing shows a non-ideal variation, which can be interpreted in term of non-random distribution of Na and Ca in the silicate network. The addition of Na2O to the Ca-silicate melts produces a decrease of the fragility of the liquid and an increase of the Q3/Q2 ratio observed with Raman spectroscopy. © 2006 Elsevier B.V. All rights reserved.
dc.subject SILICATE
dc.subject SODA-TIME MELTS
dc.subject STRUCTURE
dc.subject VISCOSITY
dc.title VISCOSITY, STRUCTURE AND MIXING IN (CA, NA) SILICATE MELTS
dc.type Статья
dc.identifier.doi 10.1016/j.chemgeo.2006.01.008


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