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Your search keyword '"Elena Borissenko"' showing total 7 results
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7 results on '"Elena Borissenko"'

1. Synchrotron powder diffraction characterization of the zeolite-based (p-N,N-dimethylnitroaniline–mordenite) guest–host phase

Author

Kenichi Kato, Juan Rodríguez-Carvajal, Masaki Takata, Mohamed Souhassou, Claude Lecomte, Florence Porcher, and Elena Borissenko

Subjects
Models, Molecular, Aniline Compounds, Chemistry, Hydrogen bond, Temperature, General Medicine, Crystal structure, Ring (chemistry), General Biochemistry, Genetics and Molecular Biology, Mordenite, Crystallography, Phase (matter), Zeolites, Molecule, Aluminum Silicates, Zeolite, Powder Diffraction, Synchrotrons, Powder diffraction
Abstract

The crystal structure of a new phase consisting of the inclusion of the hyperpolarizable molecule p-N,N-dimethylnitroaniline (dimethyl-para-nitroaniline or dmpNA) in the large-pore zeolite mordenite (MOR) has been determined from high-resolution synchrotron powder diffraction at 300 and 90 K. The unit-cell parameters and space group at 300 K are similar to those of as-synthesized mordenite. The crystallographic study indicates that the MOR straight channels are almost fully loaded with molecules that are disordered over eight symmetry-related sites. As expected, the molecules are located in the large 12-membered ring channel, at the intersection with the secondary eight-membered channel with which they might form hydrogen bonds. The elongation axes (and then the dipole moments) of the molecules are slightly tilted (28.57°) from [001]. The configuration found suggests an interaction of dmpNA with framework O atoms through its methyl groups.

Published
2008
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2. Single crystal structure of fully dehydrated partially Co2+-exchanged zeolite X: Comparison with partially dehydrated partially Co2+-exchanged zeolites X

Author

Mohamed Souhassou, Alexandre Bouché, Elena Borissenko, Claude Lecomte, and Florence Porcher

Subjects
Valence (chemistry), Inorganic chemistry, chemistry.chemical_element, General Chemistry, Crystal structure, Condensed Matter Physics, Molecular sieve, Crystal, Crystallography, chemistry, Mechanics of Materials, X-ray crystallography, General Materials Science, Zeolite, Single crystal, Cobalt
Abstract

The crystal structure of the fully dehydrated Co, Na–X zeolite (Na16Co38Al92Si100O384) is investigated and compared to that of three partially hydrated zeolites. In the fully dehydrated crystal, cobalt ions almost entirely occupy Site I, and partially Site II while the residual sodium cations partly occupy Site II and Site III. The dehydration induces a migration of Co2+ cations from Site I′ to Site I and severely affects the structure, the structural strain being released by changes of framework valence angles or, to a less extent, by distortions of TO4 tetrahedra. Comparison with dehydrated M–X zeolite structures (M = Ba, Na, Ca, Tl, Li) confirms the relation between the size of the charge compensating cation and the stresses on the skeleton that are mainly explained by cation–oxygen electrostatic interactions.

Published
2008
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3. Lattice dynamics of multiferroic BiFeO 3 studied by inelastic x-ray scattering

Author

P. Rovillain, Dorothée Colson, Michael Krisch, Alexei Bosak, Philippe Ghosez, Maximilien Cazayous, Marco Goffinet, Elena Borissenko, European Synchrotron Radiation Facility (ESRF), Centre de Physiopathologie Toulouse Purpan (CPTP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Acoustique pour les nanosciences (INSP-E3), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Nano-Magnétisme et Oxydes (LNO), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université de Liège, Centre de Physiopathologie Toulouse Purpan ex IFR 30 et IFR 150 (CPTP), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Condensed matter physics, Chemistry, Scattering, Phonon, Infrared, 02 engineering and technology, Inelastic scattering, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Symmetry (physics), symbols.namesake, 0103 physical sciences, symbols, General Materials Science, Density functional theory, Local-density approximation, 010306 general physics, 0210 nano-technology, Raman spectroscopy
Abstract

International audience; We report an experimental study of the phonon dispersion in BiFeO(3) single crystals at ambient conditions by inelastic x-ray scattering (IXS). The phonon dispersions were recorded along several symmetry directions up to 35 meV. Our results compare favorably with first-principles calculations performed using density functional theory (DFT) within the local-density approximation (LDA). We resolve a discrepancy concerning the symmetry of the optical phonon branches observed by Raman spectroscopy, determine the energy of the lowest Raman and infrared silent mode, and derive a subset of the elastic moduli of BiFeO(3).

Published
2013
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4. Suppression of thermal conductivity by rattling modes in thermoelectric sodium cobaltate

Author

S. Uthayakumar, J. P. Goff, Alexey Bosak, Liam Gannon, Elena Borissenko, E. Cemal, Michel Roger, D. G. Porter, Matthias J. Gutmann, Keith Refson, Andrea Piovano, D. J. Voneshen, Michael Krisch, Moritz Hoesch, M. Enderle, Andrew T. Boothroyd, Royal Holloway [University of London] (RHUL), STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC), European Synchrotron Radiation Facility (ESRF), Institut Laue-Langevin (ILL), ILL, ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ISIS Neutron and Muon Source (ISIS), Science and Technology Facilities Council (STFC)-Science and Technology Facilities Council (STFC), DIAMOND Light source, Groupe Modélisation et Théorie (GMT), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Physics [Oxford], University of Oxford [Oxford], Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and University of Oxford

Subjects
Materials science, Sodium, chemistry.chemical_element, 02 engineering and technology, Neutron scattering, 01 natural sciences, 7. Clean energy, Ion, Condensed Matter::Materials Science, Nuclear magnetic resonance, Thermal conductivity, 0103 physical sciences, Thermoelectric effect, Physics::Atomic and Molecular Clusters, General Materials Science, 010306 general physics, [PHYS]Physics [physics], Condensed matter physics, Mechanical Engineering, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, chemistry, Mechanics of Materials, 0210 nano-technology
Abstract

International audience; The need for both high electrical conductivity and low thermal conductivity creates a design conflict for thermoelectric systems, leading to the consideration of materials with complicated crystal structures1. Rattling of ions in cages results in low thermal conductivity2, 3, 4, 5, but understanding the mechanism through studies of the phonon dispersion using momentum-resolved spectroscopy is made difficult by the complexity of the unit cells6. We have performed inelastic X-ray and neutron scattering experiments that are in remarkable agreement with our first-principles density-functional calculations of the phonon dispersion for thermoelectric Na0.8CoO2, which has a large-period superstructure7. We have directly observed an Einstein-like rattling mode at low energy, involving large anharmonic displacements of the sodium ions inside multi-vacancy clusters. These rattling modes suppress the thermal conductivity by a factor of six compared with vacancy-free NaCoO2. Our results will guide the design of the next generation of materials for applications in solid-state refrigerators and power recovery.

Published
2013
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5. Simultaneous sound velocity and density measurements of hcp iron up to 93 GPa and 1100 K: An experimental test of the Birch's law at high temperature

Author

Daniele Antonangeli, Tetsuya Komabayashi, F. Occelli, Andrew C. Walters, Elena Borissenko, Yingwei Fei, Guillaume Fiquet, Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Department of Earth and Planetary Sciences [TITECH Tokyo], Tokyo Institute of Technology [Tokyo] (TITECH), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), European Synchrotron Radiation Facility (ESRF), Geophysical Laboratory [Carnegie Institution], Carnegie Institution for Science, Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Carnegie Institution for Science [Washington]

Subjects
Diffraction, inner core, inelastic x-ray scattering, high pressure and high temperature, 010504 meteorology & atmospheric sciences, Condensed matter physics, Scattering, Anharmonicity, Extrapolation, Inner core, Mineralogy, Atmospheric temperature range, 010502 geochemistry & geophysics, 01 natural sciences, Geophysics, Space and Planetary Science, Geochemistry and Petrology, Earth and Planetary Sciences (miscellaneous), Birch's law, Crystallite, sound velocity, hcp iron, Geology, 0105 earth and related environmental sciences, [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Abstract

International audience; We performed sound velocity and density measurements on polycrystalline hexagonal close-packed (hcp) iron at simultaneous high pressure and high temperature, up to 93 GPa and 1100 K, by inelastic x-ray scattering and x-ray diffraction. Our experimental results indicate that high-temperature anharmonic corrections are negligible at least up to 1100 K and that the aggregate compressional velocity VP scales linearly with density over the pressure and temperature range of the investigation (Birch's law). The new results are compared with literature studies and we discuss the extrapolation schemes commonly used in experimental mineral physics, with specific regard to extrapolations to the Earth's core conditions

Published
2012
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7. Lattice dynamics of multiferroic BiFeO3

Author

P. Rovillain, Elena Borissenko, Dorothée Colson, Alexei Bosak, Michael Krisch, Maximilien Cazayous, Marco Goffinet, and Philippe Ghosez

Subjects
Lattice dynamics, Materials science, Condensed matter physics, Structural Biology, Multiferroics
Published
2010
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