Note:
The term amorphous carbon is restricted to the description of carbon materials with localized π-electrons as described by P.W.Anderson (Phys. Rev., 1958, 109, 1492). Deviations in the C–C distances greater than 5%
(i.e.
,
where
is the inter-atomic distance in the crystal lattice for the
as well as for the
configuration) occur in such materials, as well as deviations in the bond angles because of the presence of 'dangling bonds'. The above description of amorphous carbon is not applicable to carbon materials with two-dimensional structural elements present in all pyrolysis residues of carbon compounds as polyaromatic layers with a nearly ideal interatomic distance of
and an extension greater than
.
,
where
is the inter-atomic distance in the crystal lattice for the
as well as for the
configuration) occur in such materials, as well as deviations in the bond angles because of the presence of 'dangling bonds'. The above description of amorphous carbon is not applicable to carbon materials with two-dimensional structural elements present in all pyrolysis residues of carbon compounds as polyaromatic layers with a nearly ideal interatomic distance of
and an extension greater than
.
See also: diamond-like carbon films
Source:
PAC, 1995, 67, 473
(Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995))
on page 477