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Correlation between temperature variations of static and dynamic properties in glass-forming liquids
D N Voylov1, P J Griffin2, B Mercado3
1Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
Abstract:
Detailed analysis of the static structure factor S(Q) in several glass-forming liquids reveals that the temperature variations of the width of the main diffraction peak ΔQ(T) correlate with the fragility of these liquids. This observation suggests a direct connection between rather subtle structural changes and sharp slowing down of structural relaxation in glass-forming liquids. We show that this observation can be rationalized using the Adam-Gibbs approach, through a connection between temperature variations of structural correlation length, l_{c}∼2π/ΔQ, and the size of cooperatively rearranging regions.
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