UNUSUAL PROPERTIES OF THE RAMAN SPECTRA OF COAL GRAPHITE FROM THE SEREGEN DEPOSIT (TAIMYR). A NEW ALLOTROPIC FORM OF CARBON?
N. N. Melnik1, S.K. Simakov2, D. S. Kostsov1
1Lebedev Physics Institute Russian Academy of Sciences, Moscow, Russia
2LLC Adamant, St. Petersburg, Russia
Keywords: fossil coals, Raman scattering, carbon allotropy
Abstract
The method of Raman scattering (RS) is used to study samples of fossil coals from various deposits. An unusual form of the Raman spectrum of coal graphite from the Seregen deposit (Taimyr) is discovered. The spectrum consists of intense narrow bands, which are usually typical for single crystals, in contrast to the standard spectra for fossil coals, i.e., broadened D and G bands and a weakly pronounced second-order Raman spectrum. The studies have shown that there is no direct analogy between the spectra of the Taimyr sample of coal graphite and the Raman spectra of other allotropic forms of carbon. Based on the experiments carried out, it is suggested that there is a possibility of the existence of a new allotropic form of carbon.
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