The high pressure phase diagram of CsC8 graphite intercalated compound has been investigated at ambient temperature up to 32 GPa. Combining X-ray and neutron diffraction, Raman and X- ray absorption spectroscopies, we report for the first time that CsC8, when pressurized, undergoes phase transitions around 2.0, 4.8 and 8 GPa. Possible candidate lattice structures and the transition mechanism involved are proposed. We show that the observed transitions involve the structural re- arrangement in the Cs sub-network while the distance between the graphitic layers is continuously reduced at least up to 8.9 GPa. Around 8 GPa, important modifications of signatures of the electronic structure measured by Raman and X-ray absorption spectroscopies evidence the onset of a new transition.
@article{arxiv.0710.4616,
title = {High pressure behavior of CsC8 graphite intercalation compound},
author = {N. Rey and P. Toulemonde and D. Machon and L. Duclaux and S. Le Floch and V. Pischedda and J. P. Itié and A. -M. Flank and P. Lagarde and W. A. Chrichton and M. Mezouar and Th. Strässle and D. Sheptyakov and G. Montagnac and A. San-Miguel},
journal= {arXiv preprint arXiv:0710.4616},
year = {2007}
}