Effect of network connectivity on thermal properties of As30Te70-xTlx glasses

Sharmila, BH and Asokan, S (2006) Effect of network connectivity on thermal properties of As30Te70-xTlx glasses. In: Philosophical Magazine Letters, 86 (3). pp. 155-163.

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Abstract

Alternating differential scanning calorimetry (ADSC) studies were undertaken to investigate the effect of Tl addition on the thermal properties of As30Te70-xTlx ( 6 <= x <= 22 at%) glasses. These include parameters such as glass-transition temperature (T-g), changes in specific heat capacity (Delta C-p) and relaxation enthalpy (Delta H-NR) at the glass transition. It was found that T-g of the glasses decreased with the addition of Tl, which is in contrast to the dependence of T-g in As - Te glasses on the addition of Al and In. The change in heat capacity Delta C-p through the glass transition was also found to decrease with increasing Tl content. The addition of Tl to the As - Te matrix may lead to a breaking of As - Te chains and the formation of Tl+Te- AsTe2/2 dipoles. There was no significant dependence of the change of relaxation enthalpy, through the glass transition, with composition.

Item Type:	Journal Article
Publication:	Philosophical Magazine Letters
Publisher:	Taylor & Francis Ltd
Additional Information:	Copyright of this article belongs to Taylor & Francis Ltd.
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	28 Sep 2010 07:36
Last Modified:	28 Sep 2010 07:36
URI:	http://eprints.iisc.ac.in/id/eprint/31667

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