Fragility correlates thermodynamic and kinetic properties of glass forming liquids

Reddy, Narayana C and Viswanatha, R and Chethana, BK and Gowda, Veeranna VC and Rao, KJ (2015) Fragility correlates thermodynamic and kinetic properties of glass forming liquids. In: MATERIALS RESEARCH BULLETIN, 63 . pp. 231-238.

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Abstract

In our earlier communication we proposed a simple fragility determining function, (NBO]/(VmTg)-T-3), which we have now used to analyze several glass systems using available thermal data. A comparison with similar fragility determining function, Delta C-p/C-p(1), introduced by Chryssikos et al. in their investigation of lithium borate glasses has also been performed and found to be more convenient quantity for discussing fragilities. We now propose a new function which uses both Delta C-p and Delta T and which gives a numerical fragility parameter, F whose value lies between 0 and 1 for glass forming liquids. F can be calculated through the use of measured thermal parameters Delta C-p, C-p(1), T-g and T-m. Use of the new fragility values in reduced viscosity equation reproduces the whole range of viscosity curves of the Angell plot. The reduced viscosity equation can be directly compared with the Adam-Gibbs viscosity equation and a heat capacity function can be formulated which reproduces satisfactorily the Delta C-p versus In(T-r) curves and hence the configurational entropy. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS RESEARCH BULLETIN
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords:	Amorphous materials; Glasses; Differential scanning calorimetry; Specific heat; Thermodynamic properties
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	19 Mar 2015 11:36
Last Modified:	19 Mar 2015 11:36
URI:	http://eprints.iisc.ac.in/id/eprint/51026

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