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Fast Dynamics in Glass-Formers: Relation to Fragility and the Kohlrausch Exponent

Published online by Cambridge University Press:  10 February 2011

K. L. Ngai  and
C. M. Roland
K. L. Ngai
Affiliation:
Naval Research Laboratory, Washington, DC 20375–5320USA, ngai@estd.nrl.navy.mil
C. M. Roland
Affiliation:
Naval Research Laboratory, Washington, DC 20375–5320USA, ngai@estd.nrl.navy.mil
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Abstract

From the Raman spectra and related inferences from low temperature specific heat data, Sokolov and coworkers have established that the ratio of the quasielastic and vibrational contributions at low temperatures (5∼10K) up to Tg correlates well with the degree of fragility and β of the glass-former. As pointed out by Sokolov (see his contribution in this Volume) such a correlation between the fast dynamics and structural a-relaxation at Tg(i.e., m and β) is intriguing, since at and below Tg, the α-relaxation time τα is more than twelve orders of magnitude longer than the quasielastic contribution and the boson peak. We show in this paper how the Coupling Model (CM) may provide an explanation for this correlation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 81
Copyright
Copyright © Materials Research Society 1997

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