The luminescent carbon-bearing microinclusion enigma in the Kimi Unit, Rhodope, Greece: Raman microscopic point analyses and mapping with different lasers

Perraki, M; Smith, DC; Mposkos, E

dc.contributor.author	Perraki, M	en
dc.contributor.author	Smith, DC	en
dc.contributor.author	Mposkos, E	en
dc.date.accessioned	2014-03-01T01:27:26Z
dc.date.available	2014-03-01T01:27:26Z
dc.date.issued	2007	en
dc.identifier.issn	1386-1425	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18446
dc.subject	Carbon	en
dc.subject	Luminescence	en
dc.subject	Raman	en
dc.subject	UHPM	en
dc.subject.classification	Spectroscopy	en
dc.subject.other	Composite materials	en
dc.subject.other	Diamonds	en
dc.subject.other	Luminescent devices	en
dc.subject.other	Nanocrystals	en
dc.subject.other	Polymorphism	en
dc.subject.other	Pressure effects	en
dc.subject.other	Raman scattering	en
dc.subject.other	Microinclusion enigma	en
dc.subject.other	Raman microscopy	en
dc.subject.other	Rhodope Metamorphic Province (RMP)	en
dc.subject.other	Ultrahigh-pressure metamorphism (UHPM)	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	carbon	en
dc.subject.other	diamond	en
dc.subject.other	article	en
dc.subject.other	chemistry	en
dc.subject.other	comparative study	en
dc.subject.other	laser	en
dc.subject.other	luminescence	en
dc.subject.other	Raman spectrometry	en
dc.subject.other	Carbon	en
dc.subject.other	Diamond	en
dc.subject.other	Lasers	en
dc.subject.other	Luminescence	en
dc.subject.other	Spectrum Analysis, Raman	en
dc.title	The luminescent carbon-bearing microinclusion enigma in the Kimi Unit, Rhodope, Greece: Raman microscopic point analyses and mapping with different lasers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.saa.2007.06.052	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.saa.2007.06.052	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	The Kimi Unit of the Rhodope Metamorphic Province (RMP), NE Greece, experienced ultrahigh-pressure metamorphism (UHPM), as documented by the unequivocal presence of diamond microinclusions in metapelitic garnet porphyroblasts. Certain peculiar lozenge-shaped 2-8 mu m sized inclusions in diamond-bearing garnets reveal a broad composite and asymmetric triplet band (phase XXX) at similar to 1331 cm(-1) in their Raman spectra acquired with a 632.8 nm He-Ne laser, initially attributed to an sp(3)-hybridized C-polymorph. These have been meticulously re-investigated by means of combined 2-wavelength (514.5 nm/632.8 nm laser) Raman microscopy. Raman mapping has been extensively employed in order to examine the spatial distribution of phase XXX and of other phases in these polyphase inclusions and to explore for additional Raman bands. The triplet band at similar to 1331 cm(-1) measured with the 632.8 nm laser shifts to much higher wavenumbers (similar to 4966 cm(-1)) when excited with a 514.5 nm Ar+ laser, proving that the XXX triplet is not a real Raman band but a luminescence one at similar to 691.1 nm. Numerous hypotheses on the nature of the mysterious phase XXX (e.g. Cr3+-bearing mineral, carbonate, C polymorph, gas, organic phase) are explored and discussed but all are shown to be unsatisfactory. It is suggested that XXX occurs as nanocrystals that luminesce strongly giving the appearance (in Raman maps) of being larger. (c) 2007 Elsevier B.V. Ail rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy	en
dc.identifier.doi	10.1016/j.saa.2007.06.052	en
dc.identifier.isi	ISI:000251747000011	en
dc.identifier.volume	68	en
dc.identifier.issue	4	en
dc.identifier.spage	1077	en
dc.identifier.epage	1084	en