Search

Your search keyword '"Mario Maglione"' showing total 3 results
Start Over Author "Mario Maglione" Journal applied physics letters
3 results on '"Mario Maglione"'

1. Low-losses, highly tunable Ba0. 6Sr0. 4TiO3/MgO composite

Author

Claude Estournès, Catherine Elissalde, U. Chan Chung, Michel Pate, Jean-Pierre Ganne, Mario Maglione, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Thales (FRANCE), Ecole Nationale Supérieure de Chimie et de Physique de Bordeaux - ENSCPB (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université de Bordeaux 1 (FRANCE), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Thales Research and Technology [Palaiseau], and THALES

Subjects
Materials science, Physics and Astronomy (miscellaneous), Ferroelectricity, Matériaux, Spark plasma sintering, Sintering, Composite, SPS, 02 engineering and technology, Dielectric, Dielectric loss and relaxation, 7. Clean energy, 01 natural sciences, 0103 physical sciences, Ceramic, Composite material, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Ferroelectric ceramics, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, visual_art, visual_art.visual_art_medium, Curie temperature, Dielectric loss, 0210 nano-technology
Abstract

Spark plasma sintering (SPS) is an efficient tool to obtain highly densified ferroelectric-dielectric ceramic composites with clean interfaces and tunable properties. Dielectric MgO and ferroelectric Ba0.6Sr0.4TiO3 (BST) were combined in two-dimensional multilayer and three-dimensional random powders design. Their unmodified BST Curie temperature proves the suppression of interdiffusion while dielectric losses are below 0.5% and the tunability is 40% at room temperature. The composites and pure BST with similar densities (>95%) were obtained, owing reliable comparison of their dielectric properties. Such SPS ceramics can be used as experimental input for simulation and are potential candidates for high frequency applications.

Published
2008
Full Text
View/download PDF

2. Linking hopping conductivity to giant dielectric permittivity in oxides

Author

U-Chan Chung, Claude Estournès, Stéphane Mornet, Catherine Elissalde, Alla Artemenko, Igor Bykov, Mario Maglione, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Institute for Problems of Material Science, National Academy of Sciences of Ukraine (NASU), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université de Bordeaux 1 (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), and NASc of Ukraine (UKRAINE)

Subjects
Permittivity, Materials science, Physics and Astronomy (miscellaneous), Matériaux, Dielectric relaxation, Relative permittivity, 02 engineering and technology, Dielectric, Conductivity, 01 natural sciences, Condensed Matter::Materials Science, Nuclear magnetic resonance, Hopping conduction, 0103 physical sciences, Ferroelectric ceramics, Barium compounds, Silicon compounds, Paramagnetic resonance, 010302 applied physics, Condensed matter physics, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Thermal conduction, Dielectric spectroscopy, Relaxation (physics), 0210 nano-technology
Abstract

International audience; With the promise of electronics breakthrough, giant dielectric permittivity materials are under deep investigations. In most of the oxides where such behavior was observed, charged defects at interfaces are quoted for such giant behavior to occur but the underlying conduction and localization mechanisms are not well known. Comparing macroscopic dielectric relaxation to microscopic dynamics of charged defects resulting from electron paramagnetic resonance investigations we identify the actual charged defects in the case of BaTiO3 ceramics and composites. This link between the thermal activation at these two complementary scales may be extended to the numerous oxides were giant dielectric behavior was found.

Published
2010
Full Text
View/download PDF

3. Electron spin resonance investigation of oxygen-vacancy-related defects in BaTiO3 thin films

Author

Mario Maglione, A. M. Slipenyuk, I. P. Bykov, J. Rosa, V. V. Laguta, Maya D. Glinchuk, Dominique Michau, and Lubomir Jastrabik

Subjects
Tetragonal crystal system, Materials science, Physics and Astronomy (miscellaneous), Condensed matter physics, law, Annealing (metallurgy), Ferroelectric thin films, Dielectric thin films, Thin film, Electron paramagnetic resonance, Ferroelectricity, Oxygen vacancy, law.invention
Abstract

The Ti3+ center, based on a regular Ti site perturbed by an oxygen vacancy (VO), is identified by electron spin resonance (ESR) in textured BaTiO3 films. The center shows tetragonal symmetry along cubic ⟨100⟩ axes with g-factors: g‖=1.997, g⊥=1.904. The spectrum of this defect disappeared after the film annealing at 700°C in an O2 atmosphere. We describe the observed spectrum as Ti3+–VO couple defects or F+ center, which have never been observed in bulk BaTiO3. ESR is thus a unique tool to identify oxygen-vacancy-related defects, which have a large effect on the performance of ferroelectric films.

Published
2005
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results