High pressure behavior of CsC8 graphite intercalation compound

Details High pressure behavior of CsC8 graphite intercalation compound High pressure behavior of CsC8 graphite intercalation compound

2007-10-25

arxiv.org/abs/0710.4616v1

Physics

Condensed Matter

Materials Science

Scientific paper

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.

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