High-pressure Raman study and lattice dynamical calculations for SrWO4

Christofilos, D; Papagelis, K; Ves, S; Kourouklis, GA; Raptis, C

dc.contributor.author	Christofilos, D	en
dc.contributor.author	Papagelis, K	en
dc.contributor.author	Ves, S	en
dc.contributor.author	Kourouklis, GA	en
dc.contributor.author	Raptis, C	en
dc.date.accessioned	2014-03-01T01:17:58Z
dc.date.available	2014-03-01T01:17:58Z
dc.date.issued	2002	en
dc.identifier.issn	0953-8984	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14726
dc.subject	High Pressure	en
dc.subject	Lattice Dynamics	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Crystal lattices	en
dc.subject.other	Eigenvalues and eigenfunctions	en
dc.subject.other	High pressure effects	en
dc.subject.other	Phase transitions	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Monoclinic structure	en
dc.subject.other	Strontium compounds	en
dc.title	High-pressure Raman study and lattice dynamical calculations for SrWO4	en
heal.type	journalArticle	en
heal.identifier.primary	10.1088/0953-8984/14/47/334	en
heal.identifier.secondary	http://dx.doi.org/10.1088/0953-8984/14/47/334	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	A high-pressure Raman study of SrWO4 reveals a pressure induced phase transition starting at 11.5 GPa. Several Raman lines exhibit a nonlinear behaviour in the pressure range of 11.5-15 GPa, which can be attributed to either stabilization of the high-pressure phase or an intermediate phase. Using a theoretical lattice dynamical calculation, based on an empirical potential model, we have obtained the Raman active mode eigenvectors giving us an insight into the phase transition mechanism. The lowest-frequency mode exhibits a negative pressure slope in the scheelite phase and involves a motion of the WO4 tetrahedron as a whole according to the theoretical results. The experimental evidence suggests that the structure of the high-pressure phase is closely related to the scheelite structure, being formed by closely lying distorted WO4 tetrahedra rather than involving an octahedrally coordinated W ion.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	Journal of Physics Condensed Matter	en
dc.identifier.doi	10.1088/0953-8984/14/47/334	en
dc.identifier.isi	ISI:000180323900038	en
dc.identifier.volume	14	en
dc.identifier.issue	47	en
dc.identifier.spage	12641	en
dc.identifier.epage	12650	en