Calculation of temperature range at the liquid-glass transition for two-component inorganic glasses

Currently, various approaches exist for describing the temperature dependence of viscosity for different substances. In the liquid-glass transition range (glass transition temperatures), one of the most successful equations for describing such dependence is the Wil-liams-Landel-Ferry equation. In this study, an attempt is made to calculate an important characteristic of the liquid-glass transition, the temperature range δTg, using the empirically determined values of the parameters C1 and C2 of this equation. The Sanditov model of delocalized atoms considers the dependence of the ratio of the temperature interval to the glass transition temperature (δTg / Tg) on the fraction of the fluctuation volume fg, frozen at the glass transition temperature Tg, which determines the molecular mobility of atoms in the liquid-glass transition region. It is known that for most glass-forming substances, the magnitude of fg = 1 / C1 weakly depends on their nature. Therefore, within the developed model, the temperature interval δTg should linearly depend on the glass transition temperature Tg. Calculations of the temperature range were carried out for two-component sodium, leadsilicate, and chalcogenide glasses.