Abstract
Kinetic studies of two-phase transformations i.e. glass transition and crystallization for GexSe70Sb30-x (x = 5, 10, 15, 20) glasses have been performed using differential scanning calorimetry (DSC) at different heating rates under non-isothermal condition. The glass transition and crystallization regions have been investigated in terms of their characteristic temperatures i.e. glass transition temperature Tg and crystallization temperature Tc and activation energy. The activation energies of glass transition and crystallization have been calculated by employing peak shift method of Kissinger and isoconversional methods. Activation energies have been found to be dependent on the composition. The thermal stabili- ty is determined from the temperature difference ΔT = Tc — Tg where Tc and Tg are the onset crystallization and glass transition temperature respectively. It has been found that Ge15Se70Sb15 glass is thermally more stable as compared to the other members of the series.
Highlights
Among amorphous semiconducting materials, chalcogenide glasses containing a large amount of chalcogen atoms sulphur, selinium and tellurium have drawn great attention because of their broad applications in technological field such as memory devices and fiber optics
The glass transition and crystallization regions have been investigated in terms of their characteristic temperatures i.e. glass transition temperature Tg and crystallization temperature the onset crystallization (Tc) and activation energy
The thermal stability is determined from the temperature difference ΔT = Tc − Tg where Tc and Tg are the onset crystallization and glass transition temperature respectively
Summary
Chalcogenide glasses containing a large amount of chalcogen atoms sulphur, selinium and tellurium have drawn great attention because of their broad applications in technological field such as memory devices and fiber optics. Pure Se has certain disadvantages like short lifetime and low stability. To improve these parameters certain other elements are added [2]. The Ge-Se-Sb alloys have good glass formation ability over a wide compositional range. This makes them good candidates as arsenic free IR transparent materials [3,4]. An effort has been made to determine the thermal stability of Ge-Se-Sb glasses
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