DOI: 10.1063/1.481674. A heterogeneous picture of α relaxation for fragile supercooled liquids

A heterogeneous picture of α relaxation for fragile supercooled liquids

10.1063/1.481674

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

We examine some of the consequences, and their connection to experiments on supercooled liquids, of a scaling model of heterogeneous relaxation that is based on the theory of frustration-limited domains. In particular, we focus on what appears to be the two slowest components of structural relaxation, the one usually described by a stretched exponential or a Cole–Davidson function and the somewhat faster, apparently power-law decay known as von-Schweidler relaxation. Based on our model we study the α-relaxation activation free energy, the imaginary part of the dielectric frequency-dependent susceptibility, the susceptibility-mastercurve of Dixon et al. [Phys. Rev. Lett. 65, 1108 (1990)], and the breakdown of the Stokes–Einstein relation for translational diffusion at low temperatures. We also obtain estimates for the characteristic domain sizes as a function of temperature. As with all mesoscopic approaches, a number of assumptions must be introduced, but they all fit the overall scaling picture that motivates this approach. The good agreement with experimental dielectric relaxation data on two representative supercooled liquids, salol and glycerol, though necessarily dependent upon adjustable parameters, gives support to the theory.

Bibliography

Viot, P., Tarjus, G., & Kivelson, D. (2000). A heterogeneous picture of Î± relaxation for fragile supercooled liquids. The Journal of Chemical Physics, 112(23), 10368â10378.

Authors 3

Pascal Viot (first)
Gilles Tarjus (additional)
Daniel Kivelson (additional)

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Dates

Type	When
Created	23 years ago (July 26, 2002, 8:44 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 8:39 p.m.)
Indexed	1 year, 6 months ago (Feb. 16, 2024, 3:19 p.m.)
Issued	25 years, 2 months ago (June 15, 2000)
Published	25 years, 2 months ago (June 15, 2000)
Published Print	25 years, 2 months ago (June 15, 2000)

Funders 0

None

BibTeX

@article{Viot_2000, title={A heterogeneous picture of α relaxation for fragile supercooled liquids}, volume={112}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.481674}, DOI={10.1063/1.481674}, number={23}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Viot, Pascal and Tarjus, Gilles and Kivelson, Daniel}, year={2000}, month=jun, pages={10368–10378} }

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