Perspective on the glass transition

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Abstract

Some of the reasons for the current interest in the phenomenology of vitrification are reviewed and progress due to, as well as limitations of, mode coupling theories (MCT) for viscosity divergence are examined. Liquids which fit the MCT predictions best are also those with the most imminent Kauzmann entropy crises near the glass transition temperature, Tg. Mode coupling predictions break down far above Tg at the point, Tx, where Goldstein long ago argued that activated processes controlled by the (3N + 1)-dimensional potential energy surface for the N- particle system should become dominant. Examining behavior in the energy topology-controlled regime, we note that ergodicity-breaking is not simply a consequence of viscosity divergence. In the liquids best fitting MCT, which are at the fragile extreme of liquid behavior, shear and structural relaxation processes slowly decouple below Tx, leading to breakdown of the Adam-Gibbs equation for viscosity. The latter in its original and derived Vogel-Fulcher forms remains valid for enthalpy (and presumably volume) relaxation processes. The distinction between strong and fragile behavior in liquids is related to the density of configurational states (minima) characterizing the potential energy surface.

Original languageEnglish (US)
Pages (from-to)863-871
Number of pages9
JournalJournal of Physics and Chemistry of Solids
Volume49
Issue number8
DOIs
StatePublished - 1988
Externally publishedYes

Fingerprint

coupled modes
Glass transition
Potential energy surfaces
glass
Liquids
Relaxation processes
Viscosity
viscosity
liquids
divergence
breakdown
potential energy
Signal filtering and prediction
Gibbs equations
vitrification
Vitrification
Structural relaxation
predictions
phenomenology
glass transition temperature

Keywords

  • configurational states
  • Glass transition
  • Kauzmann paradox
  • mode coupling
  • viscosity divergence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Perspective on the glass transition. / Angell, Charles.

In: Journal of Physics and Chemistry of Solids, Vol. 49, No. 8, 1988, p. 863-871.

Research output: Contribution to journalArticle

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