Ceramics-Silikáty 40, (3) 85 - 93 (1996) |
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THERMODILATOMETRY AND STRUCTURAL RELAXATION OF Na₂O.2SiO₂ - Na₂O.2TiO₂ GLASSES
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Liška Marek 1, Klyuev Valentin P. 1, Antalík Jozef 2,
Štubňa Igor 3
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1 Institute of Inorganic Chemistry, Slovak Academy of Sciences,
M. Rázusa 10, 911 01 Trenčín, Slovak Republic
2 Faculty of Chemical Technology, Slovak Technical University
Radlinského 9, 812 37 Bratislava, Slovak Republic
3 College of Education, A. Hlinku 1,949 74 Nitra, Slovak Republic
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The structural relaxation of title glasses studied by thermodilatometry was well described using the mathematical model based on the stretched exponential relaxation function with relaxation time proportional to instantaneous viscosity. The temperature and fictive temperature dependence of viscosity was expressed by Mazurin's approximation. The obtained relaxation parameters do not correlate significantly with the glass composition. The possible underestimating of regression estimates standard deviations was explained by the experimental data oversampling. The dependencies of equilibrium melt thermal expansion coefficient and glass transition temperature on TiO₂ mole fraction indicate the changes in TiO₂ structural role near the TiO₂ content of 20 mol.%. |
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