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VOLUME 51 (1990) | ISSUE 7 | PAGE 368
Observation of amorphous phase of carbon at pressures above 23 GPa
The Raman spectra of first and second orders and the transmission spectra of graphite single crystals have been measured at pressures up to 38 GPa. At P~ 23 GPa, a transition to a transparent phase is detected. The Raman spectra of this transparent phase are similar to those of amorphous carbon (a-C). It is concluded from any analysis of the measured second-order Raman spectra at Ρ < 23 GPa that a deformation of the graphite lattice precedes the transition to an amorphous state.