Structural changes in amorphous GeS2 at high pressure

Vaccari, M; Garbarino, G; Aquilanti, G; Coulet, M-V; Trapananti, A; Pascarelli, S; Hanfland, M; Stavrou, E; Raptis, C

dc.contributor.author	Vaccari, M	en
dc.contributor.author	Garbarino, G	en
dc.contributor.author	Aquilanti, G	en
dc.contributor.author	Coulet, M-V	en
dc.contributor.author	Trapananti, A	en
dc.contributor.author	Pascarelli, S	en
dc.contributor.author	Hanfland, M	en
dc.contributor.author	Stavrou, E	en
dc.contributor.author	Raptis, C	en
dc.date.accessioned	2014-03-01T01:34:41Z
dc.date.available	2014-03-01T01:34:41Z
dc.date.issued	2010	en
dc.identifier.issn	1098-0121	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20801
dc.subject	High Pressure	en
dc.subject	Structural Change	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	RAY-ABSORPTION-SPECTROSCOPY	en
dc.subject.other	RAMAN-SCATTERING	en
dc.subject.other	GLASS	en
dc.subject.other	POLYMORPHISM	en
dc.subject.other	CRYSTALLINE	en
dc.subject.other	TEMPERATURE	en
dc.subject.other	IFEFFIT	en
dc.subject.other	LIQUIDS	en
dc.subject.other	SYSTEMS	en
dc.subject.other	SOLIDS	en
dc.title	Structural changes in amorphous GeS2 at high pressure	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.81.014205	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.81.014205	en
heal.identifier.secondary	014205	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	High-pressure modifications in glassy GeS2 have been investigated up to 45 GPa using the diamond anvil cell through x-ray absorption fine structure (XAFS) spectroscopy and x-ray diffraction (XRD). The gradual increase in the Ge-S distance of about 0.1Å between 15 and 25 GPa evidenced by XAFS is interpreted as a signature of a coordination increase around Ge. The negative shift of the germanium K absorption edge position is connected to the progressive metallization of the glass. XRD measurements reveal the amorphous-amorphous nature of the structural transformation. The first sharp diffraction peak loses intensity and shifts toward higher Q values in the first few gigapascal, reflecting changes in the intermediate-range order prior to the local coordination increase. The observed changes are reversible after pressure release with strong hysteresis. © 2010 The American Physical Society.	en
heal.publisher	AMER PHYSICAL SOC	en
heal.journalName	Physical Review B - Condensed Matter and Materials Physics	en
dc.identifier.doi	10.1103/PhysRevB.81.014205	en
dc.identifier.isi	ISI:000274001800036	en
dc.identifier.volume	81	en
dc.identifier.issue	1	en