fragile glass

https://doi.org/10.1351/goldbook.12768
Glass characterised by a large value of the fragility index (m).
Notes:
  1. A very fragile glass has \(m \approx 250\).
  2. A fragile glass has a markedly non-Arrhenius-type temperature dependence of the viscosity and relaxation time.
  3. The Vogel–Fulcher–Tammann equation can be used to describe the relaxation-time behaviour of a fragile glass.
See: strong glass
Source:
PAC, 2013, 85, 1017. (Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)) on page 1028 [Terms] [Paper]
Citation: 'fragile glass' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.12768 RIS BibTex EndNote
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