Calculation of the energy of atomic delocalization in oxygen-free glasses

The article provides a calculation of the atomic delocalization energy for two- and three-component oxygen-free glasses based on the experimental values of the logarithms of the viscosity of these glasses in a significant temperature range. The objects of study are the following compositions: 40As-60Se, 40As-40Se-20Ge, 35BeF2 - 20AiF3 - 45RF2. In this calculation, we have used the well-known equation for the temperature dependence of viscosity - the Williams-Landel-Ferry equation. The purpose of the study is to show the possibility of calculating the energy of atomic delocalization from the above data and the relative constancy of this energy at the temperature range of 100-200 °C. It is also assumed that the values of the atomic delocalization energy for these compositions obtained from viscosity data correspond to the values calculated using the formula of the delocalized atom model, which contains one of the main parameters of this model - the fraction of the fluctuation volume at the glass transition temperature.