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Non-reversing relaxation enthalpies (DHnr) at glass transitions Tg(x) in thePxGexSe1-2x ternary display wide, sharp and deep global minima (~ 0) in the0.09 < x < 0.145 range, within which Tgs become thermally reversing. In thisreversibility window, glasses are found not to age, in contrast to agingobserved for fragile glass compositions outside the window. Thermalreversibility and lack of aging seem to be paradigms of self-organization whichmolecular glasses share with protein structures which repetitively andreversibly change conformation near Tg and the folding temperaturerespectively.

Aging, Fragility and Reversibility Window in Bulk Alloy Glasses