High pressure behavior of CsC8 graphite intercalation compound

Abstract : 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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Journal articles
Physical Review B : Condensed matter and materials physics, American Physical Society, 2008, 77 (12), pp.125433. <10.1103/PhysRevB.77.125433>


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Submitted on : Wednesday, October 24, 2007 - 5:16:02 PM
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N. Rey, Pierre Toulemonde, D. Machon, L. Duclaux, S. Le Floch, et al.. High pressure behavior of CsC8 graphite intercalation compound. Physical Review B : Condensed matter and materials physics, American Physical Society, 2008, 77 (12), pp.125433. <10.1103/PhysRevB.77.125433>. <hal-00180769>

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