Amorphous carbon is free, reactive carbon that does not have any crystalline structure (also called diamond-like carbon). Amorphous carbon materials may be stabilized by terminating dangling-π bonds with hydrogen. These materials are then called hydrogenated amorphous carbon. As with all amorphous solids, some short-range order can be observed. A...
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http://en.wikipedia.org/wiki/Amorphous_carbon
(from the article `carbon group element`) Amorphous carbon, which is solid but not clearly crystallized, probably consists of microcrystals of graphite; it is common in commerce as coke; ... ...of crystallinity. Diamond and graphite occur naturally on Earth, and they also can be produced synthetically; they are chemically inert but do ....
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http://www.britannica.com/eb/a-z/a/64
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