General Structure
In a graphite intercalation compound not every layer is necessarily occupied by guests. In so-called stage 1 compounds, graphite layers and intercalated layers alternate and in stage 2 compounds, two graphite layers with no guest material in between alternate with an intercalated layer. The actual composition may vary and therefore these compounds are an example of non-stoichiometric compounds. It is customary to specify the composition together with the stage.
At the first stage, binary graphite-metal intercalation have stoichiometry XC8 for the large metals (X = K, Rb and Cs) and XC6 for small ones (X = Li, Sr, Ba, Eu, Yb and Ca).
Read more about this topic: Graphite Intercalation Compound
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