Viscous behaviour of glass-forming liquids: a thermodynamic approach |
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Authors: | R K Mishra K S Dubey |
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Affiliation: | (1) Department of Applied Physics, Institute of Technology, Banaras Hindu University, 221 005 Varanasi, India |
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Abstract: | The temperature dependence of the viscosity of the undercooled melts exhibits an important role in the study of nucleation,
crystal growth and the glass-forming ability of materials. Several attempts have been made to study the viscous behaviour
of the glass-forming melts and these investigations are mainly based on free volume theory as well as on the configurational
entropy model. In the present investigation, an attempt has been made to correlate the thermodynamic parameters with the viscosity
of the glass-forming melts and to study the temperature dependence of the viscosity of undercooled liquids on the basis of
the free volume theory as well as on the basis of the configurational entropy model of Adam and Gibbs. The entire study is
confined on the expression for thermodynamic parameters reported by the authors recently. The expression obtained has been
successfully applied to study the temperature dependence of the viscosity of the metallic, molecular and oxide glass-forming
liquids. |
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Keywords: | Viscosity free volume configurational entropy Kauzmann temperature thermodynamic parameters |
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