Author： Del Corro Elena Gonzalez Jesus Taravillo Mercedes Escoffier Walter Baonza Valentin
Publisher： Taylor & Francis Ltd
ISSN： 0895-7959
Source： International Journal of High Pressure Research, Vol.28, Iss.4, 2008-12, pp. : 583-586
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Abstract
The combination of Raman spectroscopy and high-pressure techniques provides a unique method for studying the mechanical and structural response of carbon-based materials. Existing Raman studies on graphite under pressure were restricted to the analysis of the so-called G band, because the Raman signal from the diamond anvils overlaps other characteristic Raman features, like the D band. Here, we present a Raman spectroscopy study of highly oriented pyrolytic graphite (HOPG) under uniaxial stress using moissanite anvils. The use of moissanite has allowed us to observe, for the first time, the evolution of the D band under extreme compression. We have employed several excitation wavelengths: 632.8, 532.0 and 488.0 nm, to further study dispersion effects. Our results have important implications on the interpretation of high-pressure Raman results on several families of carbon-based compounds.
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