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Structure of Na2O-SiO2 melt as a function of composition: In situ Raman spectroscopic study

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dc.contributor.author Koroleva O.N. en
dc.contributor.author Anfilogov V.N. en
dc.contributor.author Shatskiy A. en
dc.contributor.author Litasov K.D. en
dc.date.accessioned 2018-06-18T09:24:26Z
dc.date.available 2018-06-18T09:24:26Z
dc.date.issued 2013
dc.identifier.issn 223093
dc.identifier.uri http://dspace.susu.ru/handle/0001.74/19705
dc.description.abstract The structure of x%Na2O · (100 - x)%SiO2 glasses and melts (x = 33, 40, 50, 55, 60, 67) was studied by in-situ Raman spectroscopy at temperatures from 293 to 1462 K. The curve-fitting procedure was applied for data analysis taking into account the second coordination sphere of Si atoms. To obtain a correct interpretation of all bands in Raman spectra, additional types of structural units Q12, Q21 and Q 32 were introduced into a description of the glass and melt structures. The conversion coefficients from characteristic Raman bands to concentrations of the corresponding structural units a3 = 1, a 2 = 1.26, a1 = 1.53 and a0 = 2.56 are allowed in the determination of Qn-abundance in sodium silicate melts in the range from 0 to 67 mol% Na2O. From these data the dependence of the equilibrium constants kn of the reactions 2Qn Q n - 1 + Qn + 1 was determined. It was found that equilibrium constants for di- and metasilicate glasses, k3 = 0.015 and k2 = 0.07 are in close agreement with NMR studies. The k 3 and k2 increase with increasing temperature up to 0.046 at 1243 K and 0.14 at 1462 K, respectively, which indicates an increase of the system disorder. The equilibrium constant of the reaction 2Q1 Q 2 + Q0 was found to be 0.13 ± 0.03. © 2013 Elsevier B.V. en]
dc.language.iso English
dc.relation.ispartof Journal of Non-Crystalline Solids en]
dc.subject Conversion coefficients en]
dc.subject Coordination sphere en]
dc.subject In-situ Raman spectroscopy en]
dc.subject Increasing temperatures en]
dc.subject Q<sup>n</sup>-abundance en]
dc.subject Silicate melts en]
dc.subject Sodium silicate melts en]
dc.subject Structural unit en]
dc.subject Curve fitting en]
dc.subject Equilibrium constants en]
dc.subject Glass en]
dc.subject Raman spectroscopy en]
dc.subject Silicates en]
dc.subject Spectroscopic analysis en]
dc.subject Sodium en]
dc.title Structure of Na2O-SiO2 melt as a function of composition: In situ Raman spectroscopic study en
dc.type Article en]
dc.identifier.doi 10.1016/j.jnoncrysol.2013.04.060
dc.identifier.scopus https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879146747&doi=10.1016%2fj.jnoncrysol.2013.04.060&partnerID=40&md5=7a817a6ec130708e29db2a97ef3f635f

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