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The stability of atomic intercalated carbon $K_{4}$ crystals, XC$_{2}$ (X=H,Li, Be, B, C, N, O, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ga, Ge, As, Se, Br, Rbor Sr) is evaluated by geometry optimization and frozen phonon analysis basedon first principles calculations. Although C $K_{4}$ is unstable, NaC$_{2}$ andMgC$_{2}$ are found to be stable. It is shown that NaC$_{2}$ and MgC$_{2}$ aremetallic and semi conducting, respectively.

Properties of atomic intercalated carbon K4 crystals