Abstract
The present study investigates the topological behaviour and structural modification of quaternary (Se80Te20)94−xGe6Bix (0 ≤ x ≤ 12) nano-chalcogenide alloys with the addition of Bi. The synthesis of nano-structured alloys has been achieved by melt quenching technique. The nano-nature of synthesized alloys is confirmed by x-ray diffraction and field emission scanning electron microscopy. The elemental composition of present chalcogenide system is verified by energy dispersive x-ray spectroscopy. The thermal behaviour of samples was examined through differential scanning calorimetry technique in the temperature range 300–575 K and characteristic temperatures were noted. The synthesized alloys under investigation are further studied for influence of Bi addition on their physical characteristics such as mean coordination number, number of constraints, number of lone pair electrons, theoretical density, free volume percentage, compactness, polaron radius, mean bond energy, cohesive energy and average heat of atomization. The values of glass transition temperature is theoretically calculated using Tichý-Tichá, Lankhrost and Tanaka approaches and are found in harmony with experimental outcomes.
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