Ionic salt limit in graphite–fluoroarsenate intercalation compounds

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Abstract
Starting with C8nAsF5 intercalation compounds of stage n=1 and 2, we have recorded changes with fluorine uptake in basal plane conductivity and its temperature variation, reflectivity and C(1s) core level x‐ray photoemission spectra. The data are all consistent with an ionic salt limit C+20 (0.05 electrons per C atom extracted by oxidation) beyond which direct fluorination takes place. Defect scattering from the resulting C–F bond sites is shown to be the conductivity‐limiting factor, rather than π charge localization around AsF6− sites. The present results also support our previous conclusions that the oxidation of the initial compounds by AsF5 goes only 40% and 52% to completion for stages 1 and 2, respectively.