Raman study of photostructural changes in amorphous GexSb0.4-xS0.6

Kotsalas, IP; Papadimitriou, D; Raptis, C; Vlcek, M; Frumar, M

dc.contributor.author	Kotsalas, IP	en
dc.contributor.author	Papadimitriou, D	en
dc.contributor.author	Raptis, C	en
dc.contributor.author	Vlcek, M	en
dc.contributor.author	Frumar, M	en
dc.date.accessioned	2014-03-01T01:14:06Z
dc.date.available	2014-03-01T01:14:06Z
dc.date.issued	1998	en
dc.identifier.issn	0022-3093	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12868
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0032069539&partnerID=40&md5=ccf5ef75b2e45ab5e448d4a478b6d9b1	en
dc.subject.classification	Materials Science, Ceramics	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Chemical bonds	en
dc.subject.other	Crystallization	en
dc.subject.other	Energy gap	en
dc.subject.other	Germanium compounds	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Ternary systems	en
dc.subject.other	Photostructural effect	en
dc.subject.other	Amorphous films	en
dc.title	Raman study of photostructural changes in amorphous GexSb0.4-xS0.6	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	Raman spectra of amorphous GexSb0.4-xS0.6 films and bulk samples have been measured for several values of x. The observed Raman bands are due to heteropolar M-S (M = Ge, Sb) bonds in the GeS4 tetrahedra and SbS3 pyramids, as well as homopolar (defective) M-M bonds whose population increases with increasing x. Illumination of Ge-rich ternary films by band gap light induces photo structural changes, the most prominent of which being an increase of the relative population of M-M to M-S bonds. At larger intensities of illumination (by laser light), partial crystallization of Sb occurs in both films and bulk glasses and, again, this photo structural effect is larger in Ge-rich ternary samples. It is revealed that the SbS3 pyramidal population decreases after either of the above treatments, thus underlining the key role of the Sb-S bonds in the photo structural changes. Furthermore, the extent of these effects is discussed in terms of the defective bond population, the free volume and dimensionality of the glassy network. © 1998 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Non-Crystalline Solids	en
dc.identifier.isi	ISI:000074426100011	en
dc.identifier.volume	226	en
dc.identifier.issue	1-2	en
dc.identifier.spage	85	en
dc.identifier.epage	91	en