| 摘要 |
A superhard carbon composition, having a crystal structure cell consisting of (i) a unit cell of six carbon atoms with crystallographic hexagonal symmetry, (ii) all carbon atoms in flat three-fold coordinated configurations (sp2bonding), and (iii) carbon atoms in layers of chains which zig-zag in a direction normal to the layers with each layer being rotated 60 DEG with respect to its adjacent layer. The composition has a density of about 3.2 g/cm3, a bulk modulus and a hardness exceeding diamond (bulk modulus is 6.9 Mbar), and a bonding length of 1.45-1.47 angstroms.
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