Abstract
Recently, Raman spectroscopy has evolved as a useful technique for a rapid and nondestructive characterization of carbonaceous materials. In this article, a series of heat-treated pitches from the same coal-tar precursor is investigated by means of a Raman microprobe. Separated Raman spectra are obtained for the isotropic phase and the mesophase. The evolutions observed are characteristic of the structural rearrangement change in the two phases. They correlate well with the observations reported in literature and obtained by using different methods of structural investigations.
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