, , CALCULATION OF TEMPERATURE RANGE AT THE LIQUID-GLASS TRANSITION FOR TWO-COMPONENT INORGANIC GLASSES // BSU bulletin. Chemistry. Physics. - 2024. №1. . - С. 3-13.

CALCULATION OF TEMPERATURE RANGE AT THE LIQUID-GLASS TRANSITION FOR TWO-COMPONENT INORGANIC GLASSES

The article was written within the framework of the financial support of the Dorzhi Banza- rov Buryat State University (grant No. 23-07-0502).

DOI: 10.18101/2306-2363-2024-1-3-13 UDK: 539.213:532.13

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 Williams-Landel-Ferry equation. In this study, an attempt is made to calculate an important characteristic of the liquid-glass transition, the temperature range δ Tg, 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 (δ Tg / 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 δ Tg should linearly depend on the glass transition temperature Tg. Calculations of the temperature range were carried out for two-component sodium, lead- silicate, and chalcogenide glasses.

viscosity, Williams-Landel-Ferry equation, kinetic criterion of glass transition, glass transition temperature, fraction of fluctuation volume, liquid-glass transition.