Glass transition, thermal stability and glass-forming tendency of Se85Te10X5 (X = In, Sn) chalcogenide glasses [ ]


Bulk glasses of compositions Se85Te10X5 (X = In, Sn) prepared by melt quenching technique. These samples were structurally characterized using X-ray diffraction. Kinetics of phase transformations of Se85Te10X5 (X = In, Sn) glassy compositions have been studied using differential thermal analysis (DTA) under non-isothermal conditions at five different heating rates ( = 10, 20, 30, 40 and 50o C/min). From the heating rate dependence of glass transition temperature Tg and peak crystallization temperature Tp, the activation energy of glass transition Eg, the activation energy of crystallization Ec, the order parameter (n), the dimensionality of growth and the frequency factor ko determined via three models; Kissinger, Augis-Bennett and Mahadevan et al. According to Avrami index n, the crystallization mechanism was interpreted as three-dimensional growth for Se85Te10Sn5 and two-dimensional growth for Se85Te10In5 composition. Some kinetic parameters; the Hruby number Hr, the glass formation ability (GFT), the temperature difference (Tc – Tg), the reduced glass transition temperature Trg and the thermal stability S studied as functions of heating rates and compositions.