Excess wing in the dielectric loss of glass formers: further evidence for a β-relaxation

We present dielectric loss spectra of four glass formers (propylene carbonate, glycerol, propylene glycol, and Salol) that are known to show typical excess wings, i.e. a second power law at frequencies above the α-peak. Aging experiments at sub- T g temperatures reveal a shoulder developing out of t...

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Bibliographic Details
Published inJournal of non-crystalline solids Vol. 307; pp. 336 - 344
Main Authors Lunkenheimer, P, Wehn, R, Riegger, Th, Loidl, A
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2002
Subjects
D270
77.22.Gm
G285
S132
64.70.Pf
D185
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Summary:We present dielectric loss spectra of four glass formers (propylene carbonate, glycerol, propylene glycol, and Salol) that are known to show typical excess wings, i.e. a second power law at frequencies above the α-peak. Aging experiments at sub- T g temperatures reveal a shoulder developing out of the excess wing when thermodynamic equilibrium is approached. This finding provides experimental evidence of a Johari–Goldstein β-relaxation, strongly merged with the α-peak and causing the so-far mysterious excess wing.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(02)01493-X