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The high pressure phase diagram of CsC8 graphite intercalated compound hasbeen investigated at ambient temperature up to 32 GPa. Combining X-ray andneutron diffraction, Raman and X- ray absorption spectroscopies, we report forthe first time that CsC8, when pressurized, undergoes phase transitions around2.0, 4.8 and 8 GPa. Possible candidate lattice structures and the transitionmechanism involved are proposed. We show that the observed transitions involvethe structural re- arrangement in the Cs sub-network while the distance betweenthe graphitic layers is continuously reduced at least up to 8.9 GPa. Around 8GPa, important modifications of signatures of the electronic structure measuredby Raman and X-ray absorption spectroscopies evidence the onset of a newtransition.

High pressure behavior of CsC8 graphite intercalation compound