Intercalated Graphite
When metal atoms are inserted (intercalated) between the graphite planes, several superconductors are created with the following transition temperatures:
| Material | CaC6 | Li3Ca2C6 | YbC6 | SrC6 | KC8 | RbC8 | NaC3 | KC3 | LiC3 | NaC2 | LiC2 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Tc (K) | 11.5 | 11.15 | 6.5 | 1.65 | 0.14 | 0.025 | 2.3-3.8 | 3.0 | <0.35 | 5.0 | 1.9 |
Read more about this topic: Covalent Superconductor