Thermodynamic properties of Ge0.25-yGayTe0.75-xIx glasses (y = 0.10, 0.15; x = 0 – 0.06 mol fraction) for optical applications

Abstract

For the obtained high-purity glasses of crystallization-resistant compositions Ge0.25-yGayTe0.75-xIx (y = 0.10, 0.15, x = 0-0.06 mol fractions) by method TM-DSC heat capacity experimentally determined and glass transition characteristics studied. Based on the results of theoretical processing of calorimetric data, standard thermodynamic functions were calculated in the temperature range 0–530 K which are complemented by temperature dependences of density and coefficient of thermal expansion. These thermodynamic functions are necessary for determining the conditions of synthesis by minimizing the Gibbs energy of promising representatives of the glass-forming system Ge–Ga–Te–I and prediction of the properties of glasses including those with functional additives that determine their optical-sensory applications.