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Study of Optical Vibrations Modes of Mineral Graphite by Micro Raman Spectroscopy

Published online by Cambridge University Press:  20 December 2012

R. A. Silva-Molina ,
R. Gámez-Corrales ,
J. M. Hernández-Cazares  and
I. G. Espinoza-Maldonado
R. A. Silva-Molina
Affiliation:
Universidad Autónoma de San Luis Potosí, Doctorado Institucional de Ciencia e Ingeniería en Materiales, DICIM 78290, San Luis Potosí, S.L.P., México
R. Gámez-Corrales*
Affiliation:
Departamento de Física, Universidad de Sonora, Rosales y Blvd. Luis Encinas 78000, Hermosillo, Sonora, México.
J. M. Hernández-Cazares
Affiliation:
Departamento de Geología, Universidad de Sonora, Rosales y Blvd Luis Encinas 78000, Hermosillo, Sonora, México.
I. G. Espinoza-Maldonado
Affiliation:
Departamento de Geología, Universidad de Sonora, Rosales y Blvd Luis Encinas 78000, Hermosillo, Sonora, México.
*
*E-mail: [email protected]
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Abstract

We present experimental and theoretical Raman spectra of natural graphite mineral of Sonora, Mexico. In this work, we take the advantage of the utility of the RAMAN spectroscopy as a technique to determine the crystallinity and structure of graphite mineral. The RAMAN spectroscopy provides information that can be used to determine the degree of graphitization, which in turn can be used to know the metamorphic degree of the host rock. The resulting RAMAN spectra of graphite were divided in first and second order regions, in the first region (1100-1800cm-1) the E2g vibration mode with D6h crystal symmetry occurs at 1580cm-1 (G band) that indicates poorly organized graphite, additional bands appears in the first order region at 1350 cm-1 (D band) called the defect band, and another at 1620 cm-1 (D* band). The second-order region (2200-3400cm-1) shows several bands at ~2400 ~2700 ~2900 ~3300cm-1, all of them attributed to electron-phonon interactions or combination scattering. The density functional theory calculations were applied to determine the vibrational properties and the stacking layers of graphite.

Keywords

microstructureamorphousgeologic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1481: Symposium 2D – Structural and Chemical Characterization of Metals, Alloys and Compounds—2012 , 2012 , pp. 37 - 43
Copyright
Copyright © Materials Research Society 2012

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References

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