DocumentCode :
1509119
Title :
Coupling model explanation of salient dynamic properties of glass-forming substances
Author :
Ngai, K.L.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
Volume :
8
Issue :
3
fYear :
2001
fDate :
6/1/2001 12:00:00 AM
Firstpage :
329
Lastpage :
344
Abstract :
Most of the important and general dynamic properties of structural glass-forming substances have been classified into twelve different categories in a recent review. Within the same property in each category, by examining a large number of glass-formers, a pattern of variation is found which correlates with the departure of the structural relaxation of the glass-former from exponential decay or the quantity 1-β, where β is the fractional exponent in the Kohlrausch expression exp[-(t/τ)β], that well describes the time dependence of the structural at relaxation. The correlation of the patterns or trends with 1-β suggests that the salient dynamic properties, or phenomenology, of glass-forming substances, all are governed by the non-exponential nature of the structural relaxation, i.e. the quantity 1-β. Therefore, a theory or model capable of relating the structural relaxation time τ to 1-β has the potential of explaining most, if not all, of the salient dynamic properties of glass-forming substances. The coupling model of the author has this relation. In this accompanying paper we show the coupling model can either explain or interpret all these properties
Keywords :
glass structure; glass transition; relaxation; Kohlrausch expression; coupling model; glass-forming substances; salient dynamic properties; structural relaxation; Chemicals; Frequency; Laboratories; Liquids; Predictive models;
fLanguage :
English
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/94.933340
Filename :
933340
Link To Document :
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