Ion size effects in alkali-ammonia ternary graphite intercalation compounds

作者: S.A. Solin , Y.B. Fan , X.W. Qian

DOI: 10.1016/0379-6779(85)90107-9

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摘要: Abstract The dependence of the composition and sandwich thickness M(NH 3 ) x C 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 volumetric NH weight uptake. measured compositions can be quantitatively accounted for a three-dimensional (3D) “volume available” model similar to Setton molecular K(molecule) 24 provided packing fraction α 3D is introduced. We find that 0.35 effective ammonia radius r A 1.50 . two-dimensional (2D) fails yield reasonable results.

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