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dc.contributor.authorMarques, M.-
dc.contributor.authorSuárez Ruiz, Isabel-
dc.contributor.authorFlores, D.-
dc.contributor.authorGuedes, A.-
dc.contributor.authorRodrigues, S.-
dc.identifier.citationInternational Journal of Coal Geology 77(3/4): 377-382 (2009)en_US
dc.description6 pages, 6 figures, 4 tables. -- Available online 4 July 2008. -- Issue title: CSCOP-TSOP-ICCP 2007: Selected papers from the 2007 joint meeting of CSCOP-TSOP-ICCP: Unconventional petroleum systems & advances in organic petrology and geochemistry (Victoria BC, Sunday, August 19th to Saturday August 25th, 2007)en_US
dc.description.abstractIn order to identify the parameters that best characterize the chemical and structural evolution of organic matter during coalification, the relationships between optical, chemical and micro-structural parameters in high-rank coals and natural graphite were studied. The samples include anthracites from Peñarroya–Belmez–Espiel Basin (Spain), Douro Basin (Portugal), and Alto Chicama Basin (Peru); and natural graphite from Canada, Mozambique, and Austria.en_US
dc.description.abstractCorrelations between the following optical parameters were assessed: vitrinite random reflectance (Rr), Reflectance Indicating Surfaces (RIS) axis (RMAX, RINT and RMIN), and RIS parameters (Ram, Rev and Rst), as well as Bw and AI anisotropy parameters. Furthermore, the chemical parameters used were chosen according to their significant variation in coals, namely volatile matter, carbon, and hydrogen contents calculated in dry ash free basis (VMdaf, Cdaf, Hdaf), as well as the H/C atomic ratio. Structural organization was characterized by micro-Raman spectroscopy and XRD. Raman parameters used were the full width at half maximum (FWHM) and position of G and D1 bands on the first-order Raman spectrum, and the ID1/IG intensity area ratio. The selected XRD parameters were interlayer spacing d002, and crystallite sizes La and Lc.en_US
dc.description.abstractResults show that: (i) RMAX RIS axis seems to correlate best with chemical and micro-structural parameters; (ii) for the majority of studied samples, Hdaf and H/C atomic ratio are the only chemical parameters with significant correlations with RMAX; (iii) the FWHM of the G band of Raman spectrum shows good linear correlation with the XRD parameter d002; and, (iv) structural organization of carbon materials, as measured by trends in their optical and crystalline parameters, is influenced by their hydrogen content (daf basis) and therefore by the H/C atomic ratio.en_US
dc.description.sponsorshipThis work was sponsored by a Scientific and Technical Spanish–Portuguese Cooperation, Agreement GRICES/CSIC, Programs 2004/2005 and 2006/2007; Ref. 4.1.1/CSIC for Portugal, and Refs. CSIC: 2004PT0019 and CSIC: 2005PT0036 for Spain.en_US
dc.format.extent22195 bytes-
dc.subjectHigh-rank coalsen_US
dc.subjectVitrinite anisotropyen_US
dc.subjectMicro-Raman spectroscopyen_US
dc.subjectX-ray diffractionen_US
dc.subjectChemical compositionen_US
dc.titleCorrelation between optical, chemical and micro-structural parameters of high-rank coals and graphiteen_US
dc.description.peerreviewedPeer revieweden_US
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