Abstract
In this work, the Raman scattering of melamine was studied under high pressure up to 60 GPa. The behavior of the most intensive peaks of the Raman spectrum of melamine, 677 cm−1 and 985 cm−1 modes, and their line widths do not show any phase transition or indication of formation of sp 3 bonds. Comparing the behavior of the line width of the Raman peaks of graphite under pressure and that of melamine leads us to conclude that the s-triasine (C–N) ring is more rigid than the C–C graphite ring. High pressure results with melamine suggest that the direct phase transition g-C3N4 to dense C3N4 phase should occur above 60 GPa.
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