Another allotrope

Squeeze graphite and it is possible to produce yet another form of carbon to add to the gradually growing list of diamond, graphite, fullerenes, nanotubes, graphene etc. Writing in the Nature journal "Scientific Reports", a team at Yale University shows how low-temperature conversions of graphite into M-carbon are possible when the material is under pressure. They used Raman spectroscopy and other techniques to confirm the conversion. "We found that the transformation of graphite to M-carbon is extremely sluggish and requires a long time to reach equilibrium, which may be the additional reason why this puzzle remained unsolved for the past half century," explains one author Yuejian Wang.