Thermal expansion of amorphous chalcogenide materials around their glass transition temperature

The patterns of thermal expansion of chalcogenide materials in the temperature range from room temperature to the beginning of deformation of the samples under the action of the measured force of the dilatometer cell were investigated. Above the glass transition temperature, the coefficient of linear thermal expansion of stabilized samples increases dramatically. For tempered glasses, the course of the temperature dependences of the relative elongation of the samples significantly depends on their thermal history and is of a complex nature. According to dilatometric measurements, the characteristic temperatures of the glass transition interval were determined, a qualitative assessment of structural changes was made depending on the temperature-time regimes of synthesis and annealing of chalcogenide glasses.