Abstract:
The sequence of structural transformations of a carbon material made on the basis of pitch coke during high-temperature treatment in the temperature range of 1100–2200$^\circ$C was studied by X-ray diffraction and Raman spectroscopy methods. It was shown that recrystallization of carbon materials is accompanied by the formation of graphite crystals through a number of intermediate metastable states. Increasing the treatment temperature from 1100 to $\sim$1800$^\circ$C stimulates only the recrystallization process of the nanostructured carbon material. A temperature range ($\sim$1900$^\circ$C) was found in which a sharp restructuring of the material structure occurs, manifested in significant changes in the values of the interplanar distance, the sizes of the coherent scattering regions and the phase composition of the carbon material.
Keywords:pitch coke, graphitization, X-ray diffraction analysis, Raman spectroscopy, fine structure.
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