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4 results on '"Céline Mariette"'

1. Symmetry breakings in a metal organic framework with a confined guest

Author

Eric Collet, Abdou Boucekkine, Aziz Ghoufi, José Antonio Real, Bertrand Toudic, Elzbieta Trzop, Guillaume Maurin, M. Carmen Muñoz, Jean-Yves Mevellec, Céline Mariette, Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Departamento de Física Aplicada [Universitat Politècnica de València], Universitat Politècnica de València (UPV), Instituto de Ciencia Molecular (ICMol), Universitat de València (UV), The authors thank Dmitry Chernyshov (SNBL beamline, ESRF) for his support duringthe synchrotron experiment. The authors acknowledge Jumana Shikh Almakara andSimon Le Mehaute for fruitful discussions. Thanks to the Spanish Ministerio de Economiay Competitividad (MINECO), FEDER (CTQ2016-78341-P), Unidad de ExcelenciaMara de Maeztu (MDM-2015-0538), and the Generalitat Valenciana through PROMETEO/2016/147., Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Physics, Phase transition, Space group, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Magnetic susceptibility, Crystallography, symbols.namesake, 0103 physical sciences, symbols, [CHIM]Chemical Sciences, Molecule, Density functional theory, Symmetry breaking, 010306 general physics, 0210 nano-technology, Raman spectroscopy, Single crystal
Abstract

The MOF $[{\text{Fe(tvp)}}_{2}{(\text{NCS})}_{2}]\ifmmode\cdot\else\textperiodcentered\fi{}2\text{BzCHO}$ is demonstrated to undergo a complex sequence of phase transitions and spin-crossover behavior of its constitutive ${\text{Fe}}^{\text{II}}$ ions upon adsorption of benzaldehyde guest molecules. Our study, combining Raman and synchrotron x-ray diffraction measurements on a single crystal, reveals that the conversion from the pure high-spin to the pure low-spin phases implies a rich sequence of intermediate phases, with symmetry breaking forming at least three different space groups. These different symmetries involve spin-state ordering, ligand ordering, and guest ordering, interpreted by combining magnetic susceptibility, Raman measurements, density functional theory, and force field molecular dynamics calculations.

Published
2020
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2. Long-range modulation of a composite crystal in a five-dimensional superspace

Author

Pierre Fertey, Sylvain Ravy, Thomas Weber, Laurent Guérin, Michael Huard, Bo Wang, Philippe Rabiller, Stefan C. B. Mannsfeld, Shane M. Nichols, Céline Mariette, Mark D. Hollingsworth, and Bertrand Toudic

Subjects
Physics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Superspace, 01 natural sciences, Article, Electronic, Optical and Magnetic Materials, Range (mathematics), Modulation, Quantum mechanics, 0103 physical sciences, X-ray crystallography, 010306 general physics, 0210 nano-technology, Composite crystal
Abstract

The intergrowth crystal of n-tetracosane/urea presents a misfit parameter, defined by the ratio γ = ch/cg (chost/cguest), that is very close to a commensurate value (γ ≅ 1/3). High-resolution diffraction studies presented here reveal an aperiodic misfit parameter of γ = 0.3369, which is found to be constant at all temperatures studied. A complex sequence of structural phases is reported. The high temperature phase (phase I) exists in the four-dimensional superspace group P6122(00γ). At Tc1 = 179(1) K, a ferroelastic phase transition increases the dimension of the crystallographic superspace. This orthorhombic phase (phase II) is characterized by the five-dimensional (5D) superspace group C2221(00γ)(10δ) with a modulation vector ao* + cm* = ao* + δ · ch*, in which the supplementary misfit parameter is δ = 0.025(1) in host reciprocal units. This corresponds to the appearance of a modulation of very long period (about 440 ± 16 Å). At Tc2 = 163.0(5) K, a 5D to 5D phase transition leads to the crystallographic superspace group P212121(00γ)(00δ) with a very similar value of δ. This phase transition reveals a significant hysteresis effect.

Published
2015
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3. Critical phenomena in higher dimensional spaces: The hexagonal-to-orthorhombic phase transition in aperiodicn-nonadecane/urea

Author

Claude Ecolivet, P. Bourges, Laurent Guérin, Daniele de Sanctis, Philippe Rabiller, Bertrand Toudic, Alexei Bosak, Mark D. Hollingsworth, Pilar García-Orduña, Céline Mariette, T.J.B.M. Janssen, Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, European Synchrotron Radiation Facility (ESRF), Institute for Theoretical Physics, University of Nijmegen, Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Diffraction, Physics, Phase transition, Nonadecane, Condensed matter physics, Critical phenomena, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, chemistry, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Wave vector, Orthorhombic crystal system, 61.44.Fw, 64.60.−i, 61.05.cf, Phason, 010306 general physics, 0210 nano-technology, Intensity (heat transfer)
Abstract

PACS number(s): 61.44.Fw, 64.60.−i, 61.05.cf.-- et al., Upon cooling, the aperiodic inclusion compound n-nonadecane/urea presents a hexagonal-to-orthorhombic group-subgroup phase transition at Tcl that increases the structure's superspace dimensionality from four to five. This paper reports on pretransitional phenomena in such a high-dimensional space, generalizing the critical results previously reported at a lower dimensionality. Very high-resolution diffraction data reveal anomalously large correlation lengths along the aperiodic direction, with all correlation lengths diverging at Tcl. This could be explained by low-frequency phason excitations that soften at Tcl at the critical wave vector, in accordance with an increase in the critical diffuse scattering intensity. © 2013 American Physical Society.

Published
2013
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4. Phonons in an aperiodic alkane/urea composite crystal studied by inelastic x-ray scattering

Author

Bertrand Toudic, Laurent Guérin, Claude Ecolivet, Mariana Verezhak, Philippe Rabiller, Céline Mariette, Alexei Bosak, J. Ollivier, Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Laue-Langevin (ILL), ILL, European Synchrotron Radiation Facility (ESRF), European Synchrotron Radiation Facility, 701647, Horizon 2020, 200021L_169753, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Materials science, Nonadecane, Phonon, Scattering, 02 engineering and technology, Inelastic scattering, 021001 nanoscience & nanotechnology, 01 natural sciences, Molecular physics, Transverse mode, chemistry.chemical_compound, chemistry, Aperiodic graph, 0103 physical sciences, State of matter, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 010306 general physics, 0210 nano-technology, Translational symmetry
Abstract

International audience; Aperiodic composite crystals belong to a new state of matter that possesses long-range order without translational symmetry. We report measurements of low-lying phonon branches in a n-alkane/urea compound that provide a new insight to the urea sub-lattice and the commensurate basal plane dynamics. Focusing on the thoroughly studied n-nonadecane/urea compound makes a comparison with other inelastic scattering results possible, allowing the observation of a new aperiodic elastic signature. Using three techniques, slight but reproducible difference in sound velocities is observed between the transverse mode propagating along the aperiodic direction and polarized in the commensurate basal plane, and the one polarized along the aperiodic direction propagating in the basal plane.

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