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Superdense carbon allotropes

Proposed configurations of carbon atoms

Superdense carbon allotropes are proposed configurations of carbon atoms that result in a stable material with a higher density than diamond. Few hypothetical carbon allotropes denser than diamond are known. All these allotropes can be divided at two groups: the first are hypothetically stable at ambient conditions; the second are high-pressure carbon allotropes which become quasi-stable only at high pressure.

Ambient conditions

According to the SACADA{{cite journal |author-link1= Roald Hoffmann database, the first group comprises the structures, called hP3,{{cite journal |author-link2= Artem R. Oganov |hdl-access=free |article-number=214104 |article-number=174102 |doi-access=free |article-number=045101 |doi-access=free

High-pressure carbon

The following allotropes belong to the second group: MP8,{{cite journal |article-number=066102 |bibcode=2015ChPhB..24f6102X

Band gaps

All hypothetical superdense carbon allotropes have dissimilar band gaps compared to the others. For example, SC4 is supposed to be a metallic allotrope while st12, m32, m32*, t32, t32* have band gaps larger than 5.0 eV.

Carbon tetrahedra

These new materials would have structures based on carbon tetrahedra, and represent the densest of such structures. On the opposite end of the density spectrum is a recently theorized tetrahedral structure called T-carbon. This is obtained by replacing carbon atoms in diamond with carbon tetrahedra. In contrast to superdense allotropes, T-carbon would have very low density and hardness. | access-date =2011-06-10}}

References

(2011). "T-Carbon: A Novel Carbon Allotrope". Physical Review Letters.

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