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The compositional variation of the non‐reversing enthalpy at  T  g , Δ H  nr ( x ), in   Ge  x  Se 100− xglasses decreases abruptly by an order of magnitude as  x  increases to  x  c (1) = 19.5(5)%, the rigidity transition, and then remains minuscule till  x  increases to  x  c (2) = 26.0(5)%, when the term abruptly increases by an order of magnitude as glasses become stressed‐rigid. The rigid but unstressed networks formed in between these two transitions represent the Intermediate Phase ( IP ). The square‐well like variation of Δ H  nr ( x ), also known as the reversibility window develops sloping walls, then a triangular shape and eventually disappears as glasses of increasing heterogeneity are studied. The Δ H  nr  term ages over weeks outside the  IP  but not inside the  IP . Raman line shapes of  as‐quenched melts  are quite similar to those of  T  g  ‐cycled glasses  for compositions in the  IP , but not outside the  IP – an optical analog of the thermal reversibility window. Variations of Molar volumes, display a global minimum in the  IP  and a pronounced increase outside that phase. Physical behavior of dry and homogeneous chalcogenide glasses that leads to sharp  elastic  and  chemical  phase transitions remains to be understood theoretically. The physics of network may be even more interesting than hitherto recognized.

Melt Homogenization and Self‐Organization in Chalcogenides‐Part II