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Evidence of an intermediate phase in a quaternary Ag bearing telluride glass system using alternating DSC

Varma, Sreevidya G and Das, Chandasree and Asokan, S (2014) Evidence of an intermediate phase in a quaternary Ag bearing telluride glass system using alternating DSC. In: SOLID STATE COMMUNICATIONS, 177 . pp. 108-112.

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Official URL: http://dx.doi.org/10.1016/j.ssc.2013.10.003

Abstract

Alternating Differential Scanning Calorimetric (ADSC) studies on quaternary Ge15Te80-xIn5Agx glasses show the non-reversing enthalpy (Delta H-NR) at T-g to exhibit a broad global minimum in the 8% <= x <= 16% range of Ag, an observation that is taken evidence for existence of an Intermediate Phase (IP) in that range. Glasses at x < 8% are in the flexible phase while those at x > 16% in the stressed-rigid phase. The nature of crystalline phases formed upon crystallization of bulk glasses are elucidated by XRD studies, and reveal presence of Te, GeTe, Ag8GeTe6, AgTe, In2Te3 and In4Te3 phases. These experiments also reveal that the fraction of Ag- bearing phases increases while those of Te- bearing ones decreases with increasing x, suggesting progressive replacement of Te-Te bonds by Ag-Te bonds. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, KIDLINGTON,
Keywords: Chalcogenide glasses; Intermediate phase; Chemical threshold
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Depositing User: Id for Latest eprints
Date Deposited: 07 Feb 2014 06:46
Last Modified: 07 Feb 2014 06:46
URI: http://eprints.iisc.ac.in/id/eprint/48321

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