Evolution of excess wing and beta-process in simple glass formers

The Journal of Chemical Physics
C GainaruR Böhmer

Abstract

Dielectric loss spectra of glass forming liquids are analyzed, with emphasis on systems for which a peak due to a secondary relaxation is not immediately obvious. Thus, glass formers are considered for which the high-frequency flank of the alpha-relaxation peak appears to be dominated by a so-called wing contribution. It is shown that even for such supercooled liquids the shape of the alpha-peak has to be characterized by two parameters. By performing a series of aging experiments it is demonstrated that the high-frequency flank of the alpha-relaxation, assumed to follow a power-law behavior, is superimposed by contributions from an excess wing and from a beta-relaxation peak. In particular, the excess wing, previously associated with either the alpha- or the beta-relaxation, is identified as a feature that evolves in its own right. It is argued that excess wing and beta-relaxation are always present albeit with relative strengths that may vastly differ from glass former to glass former.

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Citations

May 11, 2013·Physical Chemistry Chemical Physics : PCCP·S Hensel-BielowkaM Paluch
Oct 15, 2013·The Journal of Chemical Physics·R KahlauE A Rössler
Oct 5, 2010·The Journal of Chemical Physics·N Petzold, E A Rössler
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Methods Mentioned

BETA
light scattering

Software Mentioned

OKE

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