An-Najah Staff

Chalcogenide glasses are obtained by mixing the chalcogen elements, viz., S, Se, and Te, with elements of the periodic table such as Ga, In, Si, Ge, Sn, As, Sb,and Bi, etc. In these glasses, short-range inter-atomic forces are predominantly covalent: strong in magnitude and highly directional, whereas weak van der Waals’forces contribute significantly to the medium-range order.These materials exhibit unique physical properties that make them good candidates for several potential applications such as infrared transmission and detection,threshold and memory switching, etc. [1]. In this respect, the analysis of the compositional dependence of their properties is an important aspect of their study.Recently,we have reported the compositional dependence of the peak crystallization temperatures [2], the free volume percentage [3], the atomic density [4], the compactness [5], the glass transition temperatures [6],and the plasmon energies [7] for Ge-Se-In system.Differential scanning calorimetry (DSC) is an extensively used technique for the investigation and interpretation of thermal events in materials. In the present work, we have used DSC to establish the heat capacity jump, Cp at Tg[Cp = Cpl − Cpg,Cpl and Cpg refer to Cp values of the supercooled liquid and the glassy state, respectively], as a function of composition for Ge-Se-In glasses.

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