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Matériaux carbonés sp2/sp3 intercalés sous pression : le cas du graphite et des clathrates.

Abstract : In the present work, we have studied the evolution of alkali graphite intercalation compounds (with Li, Rb and Cs) under high pressure and high temperature conditions. This approach could lead to the formation of a cage-like class of materials, the carbon clathrates. Exceptional mechanical properties and elevate superconducting temperature have been predicted in their case. The high-pressure evolution of the structural and electronic properties of CsC8 and RbC8 is discussed. Using both local (X-ray absorption and Raman spectroscopies) and long-range order probes (X-ray and neutron diffraction), new informations up to 32 GPa and 16 GPa on CsC8 and RbC8 respectively are reported concerning charge transfer, equation of state and pressure-induced transitions. Ab initio calculations on carbon clathrates have been also performed to study their stability, their high-pressure properties and to obtain indications concerning their synthesis.
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Contributor : Nicolas Rey <>
Submitted on : Tuesday, December 4, 2007 - 8:25:29 PM
Last modification on : Thursday, October 15, 2020 - 9:00:04 AM
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  • HAL Id : tel-00192121, version 3



N. Rey. Matériaux carbonés sp2/sp3 intercalés sous pression : le cas du graphite et des clathrates.. Matière Condensée [cond-mat]. Université Claude Bernard - Lyon I, 2007. Français. ⟨tel-00192121v3⟩



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