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The Thermodynamic Significance of Order Parameters During Glass Relaxation
Author(s) -
Araujo Roger J.,
Mauro John C.
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03559.x
Subject(s) - thermodynamics , relaxation (psychology) , silicate glass , glass transition , mixing (physics) , statistical physics , thermodynamic equilibrium , alkali metal , materials science , chemistry , mineralogy , physics , polymer , psychology , social psychology , organic chemistry , quantum mechanics , composite material
The thermodynamic state of a glass is often described in terms of a number of order parameters, each of which evolves toward its equilibrium value during glass relaxation. The problem comes in identifying these order parameters and determining their physical significance. The authors argue that the order parameters in a glass can be defined in terms of a set of configurational temperatures, each corresponding to a particular mode of energy storage. The evolution of glass properties can then be calculated using a coupled set of rate equations describing the relaxation of the configurational temperatures toward their equilibrium values, viz., the reservoir temperature. The authors illustrate the concept of configurational temperatures by considering the free energy of mixing in alkali borate and silicate glasses.