High pressure behavior of CsC8 graphite intercalation compound

N. Rey; Pierre Toulemonde; D. Machon; L. Duclaux; S. Le Floch; V. Pischedda; J.P. Itié; A.-M. Flank; P. Lagarde; W.A. Chrichton; M. Mezouar; T. Strässle; D. Sheptyakov; Gilles Montagnac; A. San-Miguel

hal-00180769, version 1

High pressure behavior of CsC8 graphite intercalation compound

N. Rey ¹, Pierre Toulemonde ^1, 2, D. Machon ¹, L. Duclaux ³, S. Le Floch ¹, V. Pischedda ¹, J.P. Itié ⁴, A.-M. Flank ⁴, P. Lagarde ⁴, W.A. Chrichton ⁵, M. Mezouar ⁵, T. Strässle ⁶, D. Sheptyakov ⁶, Gilles Montagnac ⁷, A. San-Miguel ¹

Physical Review B 77, 12 (2008) 125433

Résumé : 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.

1 : Laboratoire de Physique de la Matière Condensée et Nanostructures (LPMCN)
CNRS : UMR5586 – Université Claude Bernard - Lyon I
2 : Institut Néel (NEEL)
CNRS : UPR2940 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)
3 : Laboratoire de Chimie Moléculaire et Environnement (LCME)
Université de Savoie
4 : Synchrotron SOLEIL (SSOLEIL)
CNRS : UR1
5 : European Synchrotron Radiation Facility (ESRF)
ESRF
6 : Laboratory for Neutron Scattering ETHZ & Paul Scherrer Institut
Laboratory for Neutron Scattering ETHZ & Paul Scherrer Institut
7 : Laboratoire de Sciences de la Terre (LST)
CNRS : UMR5570 – INSU – Université Claude Bernard - Lyon I – École Normale Supérieure - Lyon

hal-00180769, version 1
http://hal.archives-ouvertes.fr/hal-00180769
oai:hal.archives-ouvertes.fr:hal-00180769
Contributeur : Nicolas Rey <>
Soumis le : Mercredi 24 Octobre 2007, 17:16:02
Dernière modification le : Mardi 2 Octobre 2012, 15:24:57

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arXiv : 0710.4616

DOI : 10.1103/PhysRevB.77.125433

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%% hal-00180769, version 1
%% http://hal.archives-ouvertes.fr/hal-00180769
@article{rey:hal-00180769,
    hal_id = {hal-00180769},
    url = {http://hal.archives-ouvertes.fr/hal-00180769},
    title = {{High pressure behavior of CsC8 graphite intercalation compound}},
    author = {Rey, N. and Toulemonde, Pierre and Machon, D. and Duclaux, L. and Le Floch, S. and Pischedda, V. and Iti{\'e}, J.P. and Flank, A.-M. and Lagarde, P. and Chrichton, W.A. and Mezouar, M. and Str{\"a}ssle, T. and Sheptyakov, D. and Montagnac, Gilles and San-Miguel, A.},
    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.}},
    keywords = {graphite interclation compounds;pressure;structural transitions},
    language = {Anglais},
    affiliation = {Laboratoire de Physique de la Mati{\`e}re Condens{\'e}e et Nanostructures - LPMCN , Institut N{\'e}el - NEEL , Laboratoire de Chimie Mol{\'e}culaire et Environnement - LCME , Synchrotron SOLEIL - SSOLEIL , European Synchrotron Radiation Facility - ESRF , Laboratory for Neutron Scattering ETHZ \& Paul Scherrer Institut , Laboratoire de Sciences de la Terre - LST},
    pages = {125433},
    journal = {Physical Review B},
    volume = {77},
    number = {12 },
    audience = {internationale },
    doi = {10.1103/PhysRevB.77.125433 },
    year = {2008},
    month = Mar,
    pdf = {http://hal.archives-ouvertes.fr/hal-00180769/PDF/article.pdf},
}

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