TITLE

Single-order-parameter description of glass-forming liquids: A one-frequency test

AUTHOR(S)
Ellegaard, Niels L.; Christensen, Tage; Christiansen, Peder Voetmann; Olsen, Niels Boye; Pedersen, Ulf R.; Schro\der, Thomas B.; Dyre, Jeppe C.
PUB. DATE
February 2007
SOURCE
Journal of Chemical Physics;2/21/2007, Vol. 126 Issue 7, p074502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Thermoviscoelastic linear-response functions are calculated from the master equation describing viscous liquid inherent dynamics. From the imaginary parts of the frequency-dependent isobaric specific heat, isothermal compressibility, and isobaric thermal expansion coefficient, we define a “linear dynamic Prigogine-Defay ratio” ΛTp(ω) with the property that if ΛTp(ω)=1 at one frequency, then ΛTp(ω) is unity at all frequencies. This happens if and only if there is a single-order-parameter description of the thermoviscoelastic linear responses via an order parameter (which may be nonexponential in time). Generalizations to other cases of thermodynamic control parameters than temperature and pressure are also presented.
ACCESSION #
24101693

 

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