Nonexponential relaxations in strong and fragile glass formers

R. Böhmer, K. L. Ngai, Charles Angell, D. J. Plazek

Research output: Contribution to journalArticlepeer-review

2231 Scopus citations


Deviations from thermally activated and from exponential response are typical features of the vitrification phenomenon and previously have been studied using viscoelastic, dielectric, calorimetric, optical, and other techniques. Linear response data from literature on about 70 covalent glass formers, ionic melts, supercooled liquids, amorphous polymers, and glassy crystals are surveyed. Except for orientational glasses and monohydric aliphatic alcohols a distinct but broad correlation of non-Debye behavior with non-Arrhenius relaxations is found. Within the broad trend several groups of materials, distinguished by their respective molecular complexity, can be identified and are shown to exhibit narrow correlations. At a given degree of deviation from Arrhenius behavior externally imposed stresses are relaxed with a departure from exponential behavior which is stronger the more the molecular or atomic subunits of the glassforming material are interconnected with each other.

Original languageEnglish (US)
Pages (from-to)4201-4209
Number of pages9
JournalThe Journal of chemical physics
Issue number5
StatePublished - 1993

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Nonexponential relaxations in strong and fragile glass formers'. Together they form a unique fingerprint.

Cite this