Graphite, intercalation compounds bromides

A quite different sort of graphite intercalation compound is formed by the halides of many elements, particularly those halides which themselves have layer structures or weak intermolecular binding. The first such compound (1932) was with FeCl3 chlorides, in general, have been the most studied, but fluoride and bromide intercalates are also known. Halides which have been reported to intercalate include the following ... 

Layer misfit was first recognised in the structures of two metal chloride-graphite intercalation compounds. Intercalates of graphite with many other metal halides, including fluorides and bromides, have since been reported, but they seem to be of the CC type and are not discussed here. 

The graphite-metal halides constitute the most populous group of intercalation compounds. Most of the investigative efforts have been directed towards the metal chlorides, particularly FeCls, whereas considerably less is known about the metal bromides S21). Compounds... 

Both of the potassium and polybromide intercalation compounds are good conductors of electricity. In the potassium intcrcalant, the electrons in the conduction band can carry the current directly, as in a metal. In the compounds of graphite with poly bromide, holes in the valence band conduct by the mechanism discussed previously for semiconductors (Chapter 7). 

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