Tg versus Z dependence of glasses of the Ge-In-Se system

Giridhar, A and Mahadevan, Sudha (1992) Tg versus Z dependence of glasses of the Ge-In-Se system. Journal of Non-Crystalline Solids, 151 (3). pp. 245-252.

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Abstract

The results of measurements on the variation of the glass transition temperature (Tg) with the average coordination number (Z) are reported and discussed for glasses of the Ge-In-Se system. The study covers families of compositions with 5 and 8 at.% In, as well as compositions along the GeSe2-In2Se3 tie line. In the Tg-Z data of these glasses, a change in slope is seen at Z approximately equal to 2.40. In addition, maxima in Tg are observed at Z values corresponding to the tie line compositions of the system. An account of these features is given by the existing Phillips model and the chemically ordered network model. Some of the features observed can be explained by the formation of specific structural units in these glasses. The explanations corroborate our conclusion that, in addition to the features which have a topological origin, effects due to local chemical ordering are also observed in the glasses of this system.

Item Type: Journal Article
Uncontrolled Keywords: Germanium compounds; Phase transitions; Temperature measurement; Chemical ordering; Chemically ordered networks model; Glass transition temperature; Phillips model; Glass;
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division
Depositing User: Mr Vijaianand SK
Date Deposited: 10 Mar 2005
Last Modified: 24 May 2010 09:38
URI: http://nal-ir.nal.res.in/id/eprint/369

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