The order-disorder transition in Cs-intercalated graphite has been studied using x-ray scattering. In C₈Cs the Cs layer transforms into a liquidlike phase in which the average Cs-Cs separation is incommensurate with the carbon net. Fundamentally different behavior is observed in a Cs-deficient stage-1 sample where commensurate "lattice-gas" melting occurs. Evidence is presented which shows that in low-stage material, staging is closely related to the melting transition in support of the model of Daumas and H\'erold.
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Clarke et al. (1979) studied this question.
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