Structure and reorientational dynamics of 1-F-adamantane
hal.structure.identifier | Laboratoire des Matériaux Composites céramiques et Polymères [Université de Sfax] [LaMaCoP] | |
hal.structure.identifier | Laboratoire Ondes et Matière d'Aquitaine [LOMA] | |
dc.contributor.author | HASSINE, Bacem Ben | |
hal.structure.identifier | Laboratoire Ondes et Matière d'Aquitaine [LOMA] | |
dc.contributor.author | NÉGRIER, Philippe | |
hal.structure.identifier | Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB] | |
dc.contributor.author | ROMANINI, M. | |
hal.structure.identifier | Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB] | |
dc.contributor.author | BARRIO, M. | |
hal.structure.identifier | Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB] | |
dc.contributor.author | MACOVEZ, R | |
hal.structure.identifier | Laboratoire des Matériaux Composites céramiques et Polymères [Université de Sfax] [LaMaCoP] | |
dc.contributor.author | KALLEL, A. | |
hal.structure.identifier | Laboratoire Ondes et Matière d'Aquitaine [LOMA] | |
dc.contributor.author | MONDIEIG, Denise | |
hal.structure.identifier | Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB] | |
dc.contributor.author | TAMARIT, Josep Ll | |
dc.date.created | 2016-02-19 | |
dc.date.issued | 2016-04-28 | |
dc.identifier.issn | 1463-9076 | |
dc.description.abstractEn | The polymorphism and the dynamics of a simple rigid molecule (1-fluoro-adamantane) have been studied by means of X-ray powder diffraction and broadband dielectric spectroscopy. At temperatures below the melting point, the molecule forms an orientationally disordered Phase I with a cubic-centered structure (Phase I, Fm 3m, Z = 4). This phase possesses eight equilibrium positions for the fluorine atom, with equal occupancy factors of 1/8. A solid solid phase transition to a low-temperature tetragonal phase (Phase II, P 42 1 c, Z = 2) reduces the statistical disorder to only four possible equivalent sites for the fluorine atom, with fractional occupancies of 1/4. The dynamics has been rationalized under the constraints imposed by the space group of the crystal structure determined by powder X-ray diffraction. The dielectric spectroscopy study reveals that the statistical disorder in Phase II is dynamic in character and is associated with reorientational jumps along the two-and threefold axes. In the dielectric loss spectra, the cooperative (a) relaxation exhibits a shoulder on the high-frequency side. This remarkable finding clearly reveals the existence of two intrinsic reorientational processes associated with the exchange of the F atom along the four sites. In addition to such ''bimodal'' relaxation, a secondary Johari Goldstein relaxation is detected at lower temperatures. | |
dc.language.iso | en | |
dc.publisher | Royal Society of Chemistry | |
dc.rights.uri | http://creativecommons.org/licenses/by-sa/ | |
dc.title.en | Structure and reorientational dynamics of 1-F-adamantane | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1039/c6cp01144f | |
dc.subject.hal | Chimie/Cristallographie | |
bordeaux.journal | Physical Chemistry Chemical Physics | |
bordeaux.page | 10924-10930 | |
bordeaux.volume | 18 | |
bordeaux.issue | 16 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-01341793 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-01341793v1 | |
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