Abstract
The dependence of the composition and sandwich thickness of M(NH 3) xC 24+Δ, M = K , Rb, Cs, stage-1 alkali-ammonia ternary graphite intercalation compounds on ion size has been determined using (00ℓ) x-ray diffraction measurements together with both gravimetric and volumetric measurements of NH 3 weight uptake. The measured compositions can be quantitatively accounted for with a three-dimensional (3D) “volume available” model similar to the Setton model for the molecular composition dependence of K(molecule) xC 24 provided a packing fraction α 3D is introduced. We find that α 3D = 0.35 and that the effective ammonia radius is r A = 1.50 A ̊ . A two-dimensional (2D) model fails to yield reasonable results.
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