Quantitative structural and textural assessment of laminar pyrocarbons through Raman spectroscopy, electron diffraction and few other techniques

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dc.creatorVallerot, Jean-Marie
dc.creatorBourrat, Xavier
dc.creatorMouchon, Arnaud
dc.creatorChollon, Georges
dc.date2007-07-02
dc.date.accessioned2026-07-07T08:13:31Z
dc.date.available2026-07-07T08:13:31Z
dc.descriptionIn pyrocarbon materials, the width of the Raman D band (FWHMD) is very sensitive to low energy structural defects (e.g., disorientations of the graphene layers). The correlation between the two parameters, FWHMD and OA (as derived from selected area electron diffraction: SAED), has allowed to differentiate various pyrocarbons unambiguously. Furthermore, the optical properties of pyrocarbons, i.e., the extinction angle, the optical phase shift and the ordinary and extraordinary reflectance, have been accurately determined at 550 nm by means of the extinction curves method. These results are completed by in-plane and out-of-plane dielectric constant measurements by angular resolved EELS. Moreover, the hybridization degree of the carbon atoms has been assessed by the same technique. About 80% of the carbon atoms of the pyrocarbons have a sp2 hybridization. The lack of pure sp2 carbon atoms, as compared to graphite, might be explained by the presence of sp3-like line defects.
dc.descriptionXavier Bourrat : Present Address = ISTO - CNRS-Université d'Orléans
dc.identifierhttps://arxiv.org/abs/0707.0214
dc.identifierhttp://arxiv.org/abs/0707.0214
dc.identifierCarbon 44, 9 (2006) 1833-1844
dc.identifierdoi:10.1016/j.carbon.2005.12.029
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/132797
dc.subjectGeophysics
dc.titleQuantitative structural and textural assessment of laminar pyrocarbons through Raman spectroscopy, electron diffraction and few other techniques
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