V. B. Cajipe, P. A. Heiney, and J. E. Fischer, Phys. Rev. B39, 4374-4385 (1989).
Staging structure and kinetics in cesium-intercalated graphite were studied in situ using x-ray diffraction. The stage disorder was characterized via detailed Hendricks-Teller model analyses of (00L) profiles corresponding to various stage configurations. Both stage purity and phase separation decreased with decreasing concentration; stages 5 and higher were highly miscible, while stages 3 and 2 completely phase separated. The miscibility also varied non-monotonically during a stage-n-to-(n-1) transition, suggesting that the kinetics are island-growth dominated towards the middle of the transition. We propose that the miscibility gap observed in a previous study of potassium graphite is caused by the enhanced development of stage-(n-1) cells with increasing chemical potential (or time), triggered by island growth; as these equilibrate, a discontinously large stage-(n-1) volume results. Finally, an estimate for the exponent in the poewr-law repulsion between intercalate layers in alkali-graphite is made.
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