Temperature and pressure dependence of Raman scattering in amorphous GeS2

Perakis, A; Kotsalas, IP; Pavlatou, EA; Raptis, C

dc.contributor.author	Perakis, A	en
dc.contributor.author	Kotsalas, IP	en
dc.contributor.author	Pavlatou, EA	en
dc.contributor.author	Raptis, C	en
dc.date.accessioned	2014-03-01T01:15:17Z
dc.date.available	2014-03-01T01:15:17Z
dc.date.issued	1999	en
dc.identifier.issn	0370-1972	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13409
dc.subject	Raman Scattering	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	GERMANIUM DICHALCOGENIDES	en
dc.subject.other	SPECTRA	en
dc.subject.other	GLASSES	en
dc.title	Temperature and pressure dependence of Raman scattering in amorphous GeS2	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/(SICI)1521-3951(199901)211:1<421::AID-PSSB421>3.0.CO;2-F	en
heal.identifier.secondary	http://dx.doi.org/10.1002/(SICI)1521-3951(199901)211:1<421::AID-PSSB421>3.0.CO;2-F	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	The evolution of the Raman spectrum of amorphous GeS2 is reported over wide temperature (300 to 1075 K) and pressure (0 to 10.8 GPa) ranges. The temperature dependence shows that a-GeS2 turns gradually crystalline above T-g, first to the SD-phase and then to the layered (2D)-phase, with the latter one being retained up to the melting point and upon normal cooling to 300 K. The evolution of the A(1)(c) companion band of a-GeS2 into the crystalline phases indicates that this band is due to the symmetric stretch of S atoms in bridges of edge-sharing Ge(S-1/2)(4) tetrahedra. The Raman bands of a-GeS2 harden with increasing pressure, indicating a continuous decrease of the Ge-S bond length, while the material remains amorphous throughout the pressure range. Above 10 GPa, the material becomes almost opaque, thus making difficult the observation of Raman scattering. All these pressure induced effects are reversible after bringing the sample to ambient pressure.	en
heal.publisher	WILEY-V C H VERLAG GMBH	en
heal.journalName	Physica Status Solidi (B) Basic Research	en
dc.identifier.doi	10.1002/(SICI)1521-3951(199901)211:1<421::AID-PSSB421>3.0.CO;2-F	en
dc.identifier.isi	ISI:000078185000063	en
dc.identifier.volume	211	en
dc.identifier.issue	1	en
dc.identifier.spage	421	en
dc.identifier.epage	427	en