Fifty years of fragility

A view from the cheap seats

Research output: Contribution to journalComment/debate

Abstract

Recent advances in understanding the origins of glass-forming fragility in terms of fundamental bonding structure in network-forming glasses (NFGs) includes a proposition that the fragility index is uniquely defined by a single mean field parameter, a coarse-grained variant of the average bond density, 〈nCG〉. This finding resonates with much earlier speculations, first voiced by Nemilov in an under-appreciated paper (Nemilov, 1966), that the fragility in oxide glasses is roughly correlated to the average bridging oxygen per network-forming polyhedron. Here, we provide an abbreviated look at the history of the fragility concept and its correlations with other glass properties as well as its association to the bond topology in network-forming glasses. While we acknowledge the precedence of Nemilov's work in this area (Nemilov, 1966, 1992, 2006, 2007), we also clarify important differences between his qualitative correlation and the more quantitative findings of recent work by ourselves and others.

Original languageEnglish (US)
Article number119641
JournalJournal of Non-Crystalline Solids
Volume524
DOIs
StatePublished - Nov 15 2019

Fingerprint

Seats
seats
Glass
glass
polyhedrons
Oxides
topology
Topology
histories
Oxygen
oxides
oxygen

All Science Journal Classification (ASJC) codes

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

Cite this

Fifty years of fragility : A view from the cheap seats. / Sidebottom, David L.

In: Journal of Non-Crystalline Solids, Vol. 524, 119641, 15.11.2019.

Research output: Contribution to journalComment/debate

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