Pressure and temperature-dependent Raman study of ZnWO4

Perakis, A; Sarantopoulou, E; Raptis, C

dc.contributor.author	Perakis, A	en
dc.contributor.author	Sarantopoulou, E	en
dc.contributor.author	Raptis, C	en
dc.date.accessioned	2014-03-01T01:15:49Z
dc.date.available	2014-03-01T01:15:49Z
dc.date.issued	2000	en
dc.identifier.issn	0895-7959	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13749
dc.subject	ZnWO4	en
dc.subject	phonons	en
dc.subject	Raman scattering	en
dc.subject	pressure dependence	en
dc.subject	temperature dependence	en
dc.subject	lattice dynamics	en
dc.subject.classification	Physics, Multidisciplinary	en
dc.subject.other	SINGLE-CRYSTALS	en
dc.subject.other	SCINTILLATION	en
dc.title	Pressure and temperature-dependent Raman study of ZnWO4	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/08957950008200966	en
heal.identifier.secondary	http://dx.doi.org/10.1080/08957950008200966	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The Raman spectra of monoclinic ZnWO4 (C-2h(4)-space group) are reported over wide ranges of pressure (0 - 24 GPa) and temperature (13 -970 K). All 18 Raman active phonons are observed throughout these ranges. Combining the pressure and temperature Raman data, an identification scheme is suggested which makes possible to distinguish the internal modes (vibrations in the octahedral WO6 units) from the external ones (pure lattice modes). All phonons harden with pressure, thus showing normal positive d omega /dP slopes, and soften with temperature in the region 250-970 K (normal negative d omega /dr slopes). However, two phonons show a change of slope sign below 300 K, resulting in small positive slopes at low temperatures. Since the pressure dependence of these two phonons is normal and linear, it is concluded that. their anomalous, non-linear dependence with temperature is due to anharmonic (temperature induced) phonon interactions rather that volume expansion. It is found that ZnWO4 remains stable throughout the pressure and temperature ranges.	en
heal.publisher	GORDON BREACH SCI PUBL LTD	en
heal.journalName	HIGH PRESSURE RESEARCH	en
dc.identifier.doi	10.1080/08957950008200966	en
dc.identifier.isi	ISI:000166184700028	en
dc.identifier.volume	18	en
dc.identifier.issue	1-6	en
dc.identifier.spage	181	en
dc.identifier.epage	187	en