Carbon: A Suggested New Hexagonal Crystal Form

Science  06 Oct 1972:
Vol. 178, Issue 4056, pp. 54-56
DOI: 10.1126/science.178.4056.54


Evidence for a new polymorphic form of carbon, similar to but distinct from chaoite, has been discovered. It is trigonal, with a0 = 5.33 angstroms and c0 = 12.24 angstroms. It is produced along with chaoite on the surfaces of graphitic carbons under free-vaporization conditions at low pressures, with temperatures above approximately 2550°K.