Pressure Raman effects and internal stress in network glasses

Details Pressure Raman effects and internal stress in network glasses Pressure Raman effects and internal stress in network glasses

2007-09-27

arxiv.org/abs/0709.4437v1

Phys. Rev. B 71, 174201 (2005)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevB.71.174201

Raman scattering from binary GexSe1-x glasses under hydrostatic pressure shows onset of a steady increase in the frequency of modes of corner-sharing GeSe4 tetrahedral units when the external pressure P exceeds a threshold value Pc. 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-reversing enthalpy, DHnr(x), near glass transitions (Tgs), and in particular, both DHnr(x) and Pc(x) vanish in the reversibility window (0.20 < x < 0.25). It is suggested that Pc provides a measure of stress at the Raman active units; and its vanishing in the reversibility window suggests that these units are part of an isostatically rigid backbone. Isostaticity also accounts for the non-aging behavior of glasses observed in the reversibility window.

Affiliated with

Also associated with

No associations

Rating

Pressure Raman effects and internal stress in network glasses does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Pressure Raman effects and internal stress in network glasses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure Raman effects and internal stress in network glasses will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-482197