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Effect of network connectivity on thermal properties of $As_3_0Te_{70-x}Tl_x$ glasses

Sharmila, BH and Asokan, S (2006) Effect of network connectivity on thermal properties of $As_3_0Te_{70-x}Tl_x$ 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 $As_3_0Te_{70-x}Tl_x$ (6?=?x?=?22 at%) glasses. These include parameters such as glass-transition temperature $(T_g)$, changes in specific heat capacity $(?C_p)$ and relaxation enthalpy $(?H^N^R)$ 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 Tg in As–Te glasses on the addition of Al and In. The change in heat capacity $?C_p$ 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 $Tl^+Te^-AsTe_2_/_2$ dipoles. There was no significant dependence of the change of relaxation enthalpy, through the glass transition, with composition.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor & Francis.
Keywords: Differential scanning calorimetry;Covalent binary glasses;Transition temperature;Rigidity transitions;Local-structure
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Date Deposited: 31 May 2006
Last Modified: 27 Aug 2008 12:05
URI: http://eprints.iisc.ernet.in/id/eprint/7135

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