Intercalation of ammonia into K3C60

Article Abstract:

Intercalation of ammonia into K3C60 yields (NH3)K3C60 with an orthorhombic distortion of the face-centered cubic (f.c.c.) structure. The f.c.c. has one K and one NH3 per octahedral site. Ammonia intercalation does not appear to change the extent of the charge transfer from K to C60, but the compound is not superconducting. This could be a result of electron localization resulting from structural distortion, leading to the conclusion that the creation of C60-based superconductors is dependant on the change in symmetry of the unit cell as well as the cell size.

Ammonia, Clathrate compounds

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Intercalation of sodium heteroclusters into the C60 lattice

Article Abstract:

The C60 fullerene molecule may be doped with sodium atoms, and a stoichiometric ratio of about 10 sodium atoms to one fullerene has now been achieved. The structure is face-centered cubic up to this maximum ratio, but for a molecule with 11 sodium atoms to one fullerene, X-ray diffraction reveals a nine-atom body-centered cluster of sodium atoms at the octahedral interstitial site. This prevents distortion of the lattice at low temperatures, and should promote superconductivity.

Composition, Carbon allotropes

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Large-scale production of single-walled carbon nanotubes by the electric-arc technique

Article Abstract:

Single-walled carbon nanotubes (SWTs) can produce high yields through laser ablation of carbon targets. Electric-arc techniques have produced only low yields, but a study shows that large quantities of SWNTs can be generated using the technique, producing similar characteristics as with laser ablation. This indicates that the SWNTs growth mechanisms are independent of the details of the technique used to make them.

Usage, Carbon compounds, Electric arc, Electric arcs

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