Temperature interval for the liquid-to-glass transition

In the framework of the delocalized atoms model a new approach to the interpretation of temperature strip characterizing the temperature interval for liquid-to-glass transition is proposed. In the process of vitrification a deviation from exponential dependence of the relaxation time with temperature is observed. Since modern studies in this area are based on different calculation methods with different levels of reliability, the equation obtained by Razumovskaya and Bartenev deserves special attention. The use of this equation with the vitrification equation results in relations for the temperature strip linearly correlated with the glass transition temperature in the transition phase. Taking into account the coefficients introduced in the course of the study, the proposed equation coincides with the well-known formula for the temperature strip. In contrast to this, the temperature strip is calculated directly from the obtained ratio and experimental data. It is shown that the proposed formula does not depend on the specific form of the temperature dependence of structural relaxation time and on the change in activation energy of the vitrification process with temperature. A linear correlation of the temperature strip with the glass transition temperature for a number of inorganic glasses and amorphous polymers is presented.