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Graphite, named by Abraham Gottlob Werner in 1789, from the Greek γράφειν (graphein, "to draw/write", for its use in pencils) is one of the most common allotropes of carbon. Unlike diamond, graphite is an electrical conductor. Thus, it can be used in, for instance, electrical arc lamp electrodes.
Graphite consists of sheets of trigonal planar carbon. [18] [19] The individual layers are called graphene. In each layer, each carbon atom is bonded to three other atoms forming a continuous layer of sp 2 bonded carbon hexagons, like a honeycomb lattice with a bond length of 0.142 nm, and the distance between planes is 0.335 nm. [20]
In a similar fashion in 2001 it was found that the carbon allotrope fullerene, C 60 reacts with fluorine gas to give fullerene fluorides with stoichiometries up to C 60 F 48. [3] A precursor of carbon monofluoride is the fluorine-graphite intercalation compound, also called fluorine-GIC. Other intercalation fluorides of carbon are:
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Fullerenes had been predicted for some time, but only after their accidental synthesis in 1985 were they detected in nature [3] [4] and outer space. [5] [6] The discovery of fullerenes greatly expanded the number of known allotropes of carbon, which had previously been limited to graphite, diamond, and amorphous carbon such as soot and charcoal.
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