The expansion of the carbon-carbon bond length in potassium graphites

Abstract

Studies of the x-ray diffraction pattern from different potassium graphites have shown that intercalation of graphite by potassium is accompanied by an expansion of the carbon layers. This expansion is uniform within a single layer and is constant for all n carbon layers separating successive intercalate layers in the stagen compound of composition C12nK (n > 1). Preferred values of the C-C bond length for stages 1 to 6, derived from the value of the a-axis parameter extrapolated to θ = 90° are: