TY - JOUR
T1 - Structure of Na2O-SiO2 melt as a function of composition
T2 - In situ Raman spectroscopic study
AU - Koroleva, Olga N.
AU - Anfilogov, Vsevolod N.
AU - Shatskiy, Anton
AU - Litasov, Konstantin D.
N1 - Funding Information:
This work was financially supported by the Russian Foundation for Basic Research , project № 12-05-00294 , the Ministry of Education and Science of Russian Federation, project № 14.В37.21.1259 and the Grant of Russian Federation President № MK-6284.2013.5 . We thank the anonymous reviewers for providing useful comments, which improved the quality of the manuscript. This work is dedicated to the memory of ONK supervisor Professor V.N. Bykov, who developed the used techniques and methods and made overall important contribution into the understanding of the silicate melt structures.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - Q-abundance
KW - Raman spectroscopy
KW - Silicate melts
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U2 - 10.1016/j.jnoncrysol.2013.04.060
DO - 10.1016/j.jnoncrysol.2013.04.060
M3 - Article
AN - SCOPUS:84879146747
VL - 375
SP - 62
EP - 68
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
SN - 0022-3093
ER -