F. Goutferwurmser et al., INTERCALATION INTO GRAPHITE OF POTASSIUM SULFIDE AND SELENIDE, COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE C-CHIMIE, 1(1), 1998, pp. 29-33
The reaction between.graphite and liquid potassium, containing small a
mounts of sulphur or selenium, leads to the synthesis of new lamellar
compounds, of which the three-layered intercalated sheets can be regar
ded as potassium sulfide or selenide slices, being arranged between th
e graphene planes. These slices retain the hexagonal symmetry that the
y possess in the 3D binary chalcogenides, thanks to some adaptations.
Particularly, they become commensurate with respect to the graphene pl
anes.