Abstract
In the present paper, we have studied the effect of Ge addition on the physical properties of Se-Sn-Pb chalcogenide ma- terial. The necessary physical parameters which have important role in determining the structure and strength of the material viz. constraints, coordination number etc. have been calculated. The increasing trend has been found in cohesive energy, heat of atomization and mean bond energy. The glass transition has been studied using the Tichy-Ticha and Lankhorst approaches, which also increases with the increasing Ge contents. The increase in these physical parameters is due to the increasing covalent character in the material.
Highlights
Material science investigates the relationship between the structures of material at atomic or molecular scales and their macroscopic properties
The average coordination number r, bond stretching constraints (Nα), bond bending constraints (Nβ), average number of constraints Nco = Nα+Nβ, fraction of floppy modes (f) and loan pair (L) for various compositions with Ge are listed in Table
Considerable attention has been devoted to the prediction of glass transition temperature (Tg) of chalcogenide based glasses
Summary
Material science investigates the relationship between the structures of material at atomic or molecular scales and their macroscopic properties. The glass transition temperature and the related nature of the chemical bond are important parameters for characterization of chalcogenide glasses These materials can be reversibly switched between the amorphous and crystalline state and find applications in rewritable optical recording and in electrically programmable non-volatile memories [1,2,3]. It has been realized by Mott that charged additives could change the ratio of valence-alternation pairs to such an extent that the Fermi energy could become unpinned, which causes carrier type reversal in certain chalcogenide systems Metallic additives such as Bi and Pb in chalcogenide glasses enter the network as charged species, altering the concentration of valence-alternation pairs, which is located closely above the loan pair band of selenium. This feature makes Pb unique in the contest to p to n transition of chalcogenide glasses [5,6,7,8,9]
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