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  • 1 Slovak Academy of Sciences Institute of Inorganic Chemistry M. Rázusa 10 911 01 Trenčín M. Rázusa 10 911 01 Trenčín
  • 2 Slovak Technical University Faculty of Chemical Technology Radlinského 9 812 37 Bratislava Radlinského 9 812 37 Bratislava
  • 3 College of Education A. Hlinku 1 949 74 Nitra Slovakia A. Hlinku 1 949 74 Nitra Slovakia
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Abstract  

The enthalpic relaxation of the title glasses, studied by differential scanning calorimetry, is well described by a mathematical model based on the stretched exponential relaxation function with the relaxation time proportional to the actual viscosity. The dependence of viscosity on temperature and the fictive temperature was expressed by Mazurin's approximation. The relaxation parameters obtained correlated significantly with the glass composition, indicating the changes in the structural of the TiO2 role near a TiO2 content of 3–4 mol%.