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Amorphous carbon : ウィキペディア英語版
Amorphous carbon
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. Amorphous carbon is often abbreviated to ''aC'' for general amorphous carbon, ''aC:H'' or ''HAC'' for hydrogenated amorphous carbon, or to ''ta-C'' for tetrahedral amorphous carbon.
== In mineralogy ==

In mineralogy, amorphous carbon is the name used for coal, soot, carbide-derived carbon, and other impure forms of carbon that are neither graphite nor diamond. In a crystallographic sense, however, these materials are not truly amorphous, but are polycrystalline materials of graphite or diamond within an amorphous carbon matrix. Commercial carbon also usually contains significant quantities of other elements, which may also form crystalline impurities.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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