Synchrotron X-ray diffraction study of the room temperature incommensurate phase in graphite-bromine intercalation compound

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Abstract
Synchrotron X-ray and a four-circle diffractometer were used to study the room temperature incommensurate phase in stage-2 graphite-bromine prepared with single crystal graphite in bromine liquid. The two strongest in-plane superlattice reflections and the strongest satellite peak were scanned along the most incommensurate direction of the lattice between 302 K and 324 K. The incommensurate-commensurate transition at 319 ± 1 K caused disappearance of the incommensurate peaks and appearance of the commensurate one. Possible models of the incommensurate phase are presented