Undercooled phase behind the glass phase with superheated medium-range order above glass transition temperature

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