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dc.contributor.authorChandrasekhar, Meeraeng
dc.contributor.authorWang, Feieng
dc.contributor.authorMamedov, S.eng
dc.contributor.authorBoolchand, P.eng
dc.contributor.authorGoodman, B.eng
dc.date.issued2005eng
dc.descriptionDOI: 10.1103/PhysRevB.71.174201 http://link.aps.org/doi/10.1103/PhysRevB.71.174201eng
dc.description.abstractRaman 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 nonreversing enthalpy, ΔHnr(x), near glass transitions (Tgs), and in particular, both ΔHnr(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 nonaging behavior of glasses observed in the reversibility window.eng
dc.description.sponsorshipThis work is supported by NSF Grants No. DMR-01-01808 and No. 04-56472.eng
dc.identifier.citationPhys. Rev. B 71, 174201 (2005)eng
dc.identifier.issn1098-0121eng
dc.identifier.urihttp://hdl.handle.net/10355/7256eng
dc.languageEnglisheng
dc.publisherAmerican Physical Societyeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. College of Arts and Sciences. Department of Physics and Astronomy. Physics and Astronomy publicationseng
dc.subjectvibrational states in disordered systemseng
dc.subject.lcshHigh pressure (Science) -- Researcheng
dc.subject.lcshSolidseng
dc.subject.lcshLiquidseng
dc.subject.lcshShock waveseng
dc.subject.lcshVibrationeng
dc.subject.lcshGlass -- Researcheng
dc.titlePressure Raman effects and internal stress in network glasseseng
dc.typeArticleeng


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