Topological consideration of thallium on glassy arsenous selenide

✍ Scribed by S.A. Fayek; S.S. Fouad

• Book ID: 104266191
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 107 KB
• Volume: 52
• Category: Article
• ISSN: 0042-207X
• DOI: 10.1016/s0042-207x(98)00322-4

✦ Synopsis

Understanding of the effect of the addition of Tl on glassy As Se prepared under vacuum, has greatly improved with the advent of several structural and chemical models, which predict the influence of such an addition, in terms of the average heat of atomization H and the average coordination number N . The latter are computed from the atomization and the coordination number of the elements, respectively. A correlation had been found between the chalcogenide system (As Se ) \V Tl V and the number of lone-pair electrons. The stable vitreous state can be obtained only if enough lone-pair electrons exist in the structure of the chalcogenide system. The cation in the chalcogenide glasses may interact with the lone-pair electrons, of bridging chalcogen atoms and influence the glass forming ability. Investigation of the dependence of the differential thermal analysis (DTA) and, optical gap E ''previously published'' on the composition of vacuum prepared (As Se ) \V Tl V revealed that the average coordination number N , has a great effect on these properties. The nature of the N dependencies is discussed in relation to topological and percolative consideration.