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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Published in | Journal of non-crystalline solids Vol. 307; pp. 336 - 344 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.09.2002
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 0022-3093 1873-4812 |
DOI: | 10.1016/S0022-3093(02)01493-X |