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(a) Raman spectra of HOPG collected under room temperature and high pressure up to 30 GPa.The G peak from the HOPG sample is labeled and boxed. (b) Full-width at half-maximum (FWHM) of the G peak of HOPG under compression. At pressures above ~20 GPa, the FWHM increases, showing the disappearance of H-graphite and appearance of the new high-pressure phase.
