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Diamond from fullerenes: Evidence from Raman measurements.

We present the Raman characterization of transformed fullerene samples obtained by applying high (∼20 GPa) nonhydrostatic pressures on C 60 or C 60 -C 70 powders. Only two clear features are observed. The first is a peak at 1330 cm -1 , signature of the existence of cubic diamond. The second is a broadband of unknown origin centered at approximately 1450 cm -1 . These results confirm previous crystallographic analysis that showed that our samples consist of polycrystalline diamond embedded in an amorphous matrix