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Title: Fragility correlates thermodynamic and kinetic properties of glass forming liquids

Abstract

Graphical abstract: The suggested new fragility parameter correlates viscosity and configurational entropy. - Highlights: • A new fragility function, F=ΔT/ΔC{sub p}×C{sub p}{sup l}/T{sub g} has been proposed. • A three parameter viscosity function using the new F reproduces Angell fragility plot. • A new ΔC{sub p} function is derived which directly relates Adam–Gibbs function with the fragility based viscosity function. - Abstract: In our earlier communication we proposed a simple fragility determining function, ([NBO]/V{sub m}{sup 3}T{sub g}), which we have now used to analyze several glass systems using available thermal data. A comparison with similar fragility determining function, ΔC{sub p}/C{sub p}{sup l}, 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 ΔC{sub p} and ΔT 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 ΔC{sub p}, C{sub p}{sup l}, T{sub g} and T{sub m}. Use of the new fragility values in reduced viscosity equation reproduces the whole range of viscosity curves of themore » 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 ΔC{sub p} versus ln(T{sub r}) curves and hence the configurational entropy.« less

Authors:
 [1]; ;  [2];  [3];  [2]
  1. Maharani’s Science College for Women, Bangalore 560001 (India)
  2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 (India)
  3. Government First Grade College, Jayanagara, Bangalore 560070 (India)
Publication Date:
OSTI Identifier:
22420842
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 63; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORATES; CALORIMETRY; COMPARATIVE EVALUATIONS; ENTROPY; GLASS; LIQUIDS; LITHIUM; SPECIFIC HEAT; VISCOSITY

Citation Formats

Reddy, C.Narayana, Viswanatha, R., Chethana, B.K., Gowda, V.C.Veeranna, and Rao, K.J., E-mail: kalyajrao@yahoo.co.in. Fragility correlates thermodynamic and kinetic properties of glass forming liquids. United States: N. p., 2015. Web. doi:10.1016/J.MATERRESBULL.2014.12.014.
Reddy, C.Narayana, Viswanatha, R., Chethana, B.K., Gowda, V.C.Veeranna, & Rao, K.J., E-mail: kalyajrao@yahoo.co.in. Fragility correlates thermodynamic and kinetic properties of glass forming liquids. United States. doi:10.1016/J.MATERRESBULL.2014.12.014.
Reddy, C.Narayana, Viswanatha, R., Chethana, B.K., Gowda, V.C.Veeranna, and Rao, K.J., E-mail: kalyajrao@yahoo.co.in. Sun . "Fragility correlates thermodynamic and kinetic properties of glass forming liquids". United States. doi:10.1016/J.MATERRESBULL.2014.12.014.
@article{osti_22420842,
title = {Fragility correlates thermodynamic and kinetic properties of glass forming liquids},
author = {Reddy, C.Narayana and Viswanatha, R. and Chethana, B.K. and Gowda, V.C.Veeranna and Rao, K.J., E-mail: kalyajrao@yahoo.co.in},
abstractNote = {Graphical abstract: The suggested new fragility parameter correlates viscosity and configurational entropy. - Highlights: • A new fragility function, F=ΔT/ΔC{sub p}×C{sub p}{sup l}/T{sub g} has been proposed. • A three parameter viscosity function using the new F reproduces Angell fragility plot. • A new ΔC{sub p} function is derived which directly relates Adam–Gibbs function with the fragility based viscosity function. - Abstract: In our earlier communication we proposed a simple fragility determining function, ([NBO]/V{sub m}{sup 3}T{sub g}), which we have now used to analyze several glass systems using available thermal data. A comparison with similar fragility determining function, ΔC{sub p}/C{sub p}{sup l}, 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 ΔC{sub p} and ΔT 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 ΔC{sub p}, C{sub p}{sup l}, T{sub g} and T{sub 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 ΔC{sub p} versus ln(T{sub r}) curves and hence the configurational entropy.},
doi = {10.1016/J.MATERRESBULL.2014.12.014},
journal = {Materials Research Bulletin},
number = ,
volume = 63,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}