The kinetics of the ammoniation of KC24 to form the ternary graphite intercalation compound K(NH3)xC24, with x = 0 to 4.38, was studied by monitoring the time dependence of the c-axis resistance. The results were in quantitative agreement with a two-dimensional diffusion model which yielded a diffusion constant of about 10-8cm2/s. In contrast to binary graphite intercalation compounds which exhibit intercalation kinetics that may be limited by the growth of planar multi-degenerate domains, the K-NH3 ternary system provides a clear example of two-dimensional diffusion-limited intercalation.

Two-Dimensional Diffusion-Limited Kinetics in a Ternary Graphite Intercalation Compound. Huang, Y.Y., Stump, D.R., Solin, S.A., Heremans, J.: Solid State Communications, 1987, 61[8], 469-73