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Correlation of nonexponentiality with dynamic heterogeneity from four-point dynamic susceptibility and its approximation
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10.1063/1.3481355
/content/aip/journal/jcp/133/12/10.1063/1.3481355
http://aip.metastore.ingenta.com/content/aip/journal/jcp/133/12/10.1063/1.3481355
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Kohlrausch exponent as a function of the product variable for simulated LJ particles. Each symbol represents a distinct state point. Fits to the self-intermediate scattering function at longer time are shown for two temperatures in the inset. Simulation data are from Ref. 28.

Image of FIG. 2.
FIG. 2.

Kohlrausch exponent as a function of the relaxation time determined from fits of at longer time. Each symbol represents a distinct state point. Simulation data are from Ref. 28.

Image of FIG. 3.
FIG. 3.

from [Eq. (2)—open symbols] and from [Eq. (4)—filled symbols] vs the Kohlrausch exponent for LJ particles. Each symbol represents a distinct state point. Increasing dynamic heterogeneity is associated with a broader dispersion of relaxation times. The approximation departs from the rigorous calculation at higher temperatures and lower densities. Simulation data are from Ref. 28.

Image of FIG. 4.
FIG. 4.

Plot of Kohlrausch exponent vs obtained from the approximation for 45 glass-formers at and atmospheric pressure (data are from Ref. 34): polymers (diamonds), oxide glass-formers and selenium (circles), hydrogen bonded materials (triangles), and van der Waals glass-formers (squares). The absence of correlation is indicated by the small value of the Pearson linear correlation coefficient.

Image of FIG. 5.
FIG. 5.

Fragility corresponding to data in Fig. 4. Correlation coefficient is indicated.

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/content/aip/journal/jcp/133/12/10.1063/1.3481355
2010-09-24
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Correlation of nonexponentiality with dynamic heterogeneity from four-point dynamic susceptibility χ4(t) and its approximation χT(t)
http://aip.metastore.ingenta.com/content/aip/journal/jcp/133/12/10.1063/1.3481355
10.1063/1.3481355
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