Susceptibility Studies of Supercooled Liquids and Glasses View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1993

AUTHORS

Sidney R. Nagel

ABSTRACT

These lectures review the results of a number of susceptibility studies of supercooled liquids and glasses. Dielectric response and specific-heat spectroscopy can investigate the motions that occur at the glass transition, Tg, as the liquid slows down and approaches an amorphous solid. In contrast to predictions of mode-coupling theory, these experiments give no evidence of a critical slowing down occurring at high temperature but rather indicate a divergence of the relaxation-time scales at a much lower value close to the Kauzmann temperature where the extrapolation of the entropy of the liquid state crosses that of the crystal. In addition, the dielectric relaxation of the liquid (for all temperatures and samples measured) can be scaled onto a single master curve. In addition to this primary relaxation, dielectric susceptibility can give detailed information about the secondary (Johari-Goldstein) relaxation occurring in the glass phase below Tg. For several glasses, the dielectric studies indicate that the secondary relaxation is due to the activation of single, uncoupled, entities over barriers which have a Gaussian distribution of energies. More... »

PAGES

259-283

Book

TITLE

Phase Transitions and Relaxation in Systems with Competing Energy Scales

ISBN

978-94-010-4843-9
978-94-011-1908-5

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-94-011-1908-5_12

DOI

http://dx.doi.org/10.1007/978-94-011-1908-5_12

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1010458859


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