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Article Dans Une Revue Physica B: Condensed Matter Année : 2021

Undercooled Phase Behind the Glass Phase with Superheated Medium-Range Order above Glass Transition Temperature

Robert Tournier
Michael I Ojovan
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Résumé

Rapidly quenched glass formers are amorphous and transformed into glass phases by relaxing enthalpy during the first heating. Two liquids give rise, at first, to an intermediate Phase 3 below T3 < Tg respecting the entropy constraints and then, the enthalpy increases towards that of the glass phase up to Tg. The negative activation energy shows that Phase 3 is hidden behind the glassy phase acting as an intermediate invasive phase during the second cooling. Phase 3 carries a medium-range order above Tg which can be superheated above the melting temperature up to Tn+. The two-liquid state model predicts the thermodynamic properties as well as the relaxation times from liquids 1 to 2. The configuron model is successfully applied to 54 glasses explaining the transitions by percolation and an 'ordered' fraction equal to the critical threshold c = 0.15 ± 0.01 from Tg to Tn+.
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Dates et versions

hal-03029272 , version 1 (28-11-2020)
hal-03029272 , version 2 (06-02-2021)

Identifiants

Citer

Robert Tournier, Michael I Ojovan. Undercooled Phase Behind the Glass Phase with Superheated Medium-Range Order above Glass Transition Temperature. Physica B: Condensed Matter, 2021, 602, pp.412542. ⟨10.1016/j.physb.2020.412542⟩. ⟨hal-03029272v2⟩

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