Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 557, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2019.03.032
Keywords
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Funding
- NSF-DMR [:1832817]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1832817] Funding Source: National Science Foundation
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Fragile-to-strong (FTS) transitions have been observed in all categories of glass-forming systems, leading to a change from Arrhenius to non-Arrhenius viscosity behavior, along with anomalies in various thermodynamic variables. Experimental evidence supports the presence of FTS transitions, where a peak in heat capacity and density extrema with a negative expansion coefficient are found. Spectroscopic analyses also reveal distinct structural changes across these liquid-liquid transitions. Reports of FTS transitions in each category of liquid are reviewed.
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.
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