Fragile-to-strong transitions in glass forming liquids

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Abstract

Since they were first reported almost two decades ago, fragile-to-strong (FTS) transitions have been observed in all categories of glass-forming systems including metallic, covalent, ionic and molecular liquids. In these systems, a transition from Arrhenius to non-Arrhenius viscosity behavior is observed in conjunction with anomalies in multiple thermodynamic variables including the heat capacity, the thermal expansion coefficient and the isothermal compressibility. A review of experimental evidences supporting the existence of FTS transitions is presented. In particular FTS transitions are found to be concomitant with a peak in heat-capacity as well as density extrema associated with a negative expansion coefficient in the region of the transition. Moreover, spectroscopic analyses also show distinct structural changes across these liquid-liquid transitions. Reports of FTS transitions in each category of liquid are reviewed.

Original languageEnglish (US)
Article number100034
JournalJournal of Non-Crystalline Solids: X
Volume4
DOIs
Publication statusPublished - Dec 1 2019

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Keywords

  • Entropy
  • Fragility
  • Polyamorphism
  • Viscosity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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