Rapid quenching and glass formation in chalcogenide glasses: Preparation and properties of Ge-As-Te glasses over an extended composition ranges

Ramesh, K (2009) Rapid quenching and glass formation in chalcogenide glasses: Preparation and properties of Ge-As-Te glasses over an extended composition ranges. In: International Symposium on Non-Oxide and New Optical Glasses Univ Montpellier 2, APR 20-25, 2008, Montpellier, France, pp. 2045-2049.

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Abstract

In Ge-As-Te system, the glass forming region determined by normal melt quenching method has two regions (GFR I and GFR II) separated by few compositions gap. With a simple laboratory built twin roller apparatus, we have succeeded in preparing Ge7.5AsxTe92.5-x glasses over extended composition ranges. A distinct change in T-g is observed at x = 40, exactly at which the separation of the glass forming regions occur indicating the changes in the connectivity and the rigidity of the structural network. The maximum observed in glass transition (T-g) at x = 55 corresponding to the average coordination number (Z(av)) = 2.70 is an evidence for the shift of the rigidity percolation threshold (RPT) from Z(av) = 2.40 as predicted by the recent theories. The glass forming tendency (K-gl) and Delta T (=T-c-T-g) is low for the glasses in the GFR I and high for the glasses in the GFR II.

Item Type:	Conference Paper
Publication:	JOURNAL OF NON-CRYSTALLINE SOLIDS
Publisher:	Elsevier Science
Additional Information:	International Symposium on Non-Oxide and New Optical Glasses, Montpellier, FRANCE, APR 20-25, 2008
Keywords:	Amorphous semiconductors; X-ray diffraction; Glass formation; Glass transition; Infrared glasses; Chalcogenides; Thermal properties; Calorimetry; Glass transition
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Jan 2010 06:30
Last Modified:	19 Sep 2010 05:52
URI:	http://eprints.iisc.ac.in/id/eprint/24820

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