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Raman scattering from binary GexSe1-x glasses under hydrostatic pressureshows onset of a steady increase in the frequency of modes of corner-sharingGeSe4 tetrahedral units when the external pressure P exceeds a threshold valuePc. The threshold pressure Pc(x) decreases with x in the 0.15 < x < 0.20 range,nearly vanishes in the 0.20 < x < 0.25 range, and then increases in the 0.25 <x < 1/3 range. These Pc(x) trends closely track those in the non-reversingenthalpy, DHnr(x), near glass transitions (Tgs), and in particular, bothDHnr(x) and Pc(x) vanish in the reversibility window (0.20 < x < 0.25). It issuggested that Pc provides a measure of stress at the Raman active units; andits vanishing in the reversibility window suggests that these units are part ofan isostatically rigid backbone. Isostaticity also accounts for the non-agingbehavior of glasses observed in the reversibility window.

Pressure Raman effects and internal stress in network glasses