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Elaboration Et Caracterisation De Ceramiques Ferroelectriques De Type Pzt Fluorure
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Book Synopsis Elaboration et caractérisation de céramiques ferroélectriques de type PZT fluorure by : Benoît Guiffard
Download or read book Elaboration et caractérisation de céramiques ferroélectriques de type PZT fluorure written by Benoît Guiffard and published by . This book was released on 1999 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les céramiques ferroélectriques de formulation générale Pb(ZrxTi1-x)O3 (PZT) sont massivement utilisées dans de nombreux domaines comme la médecine ou l'aéronautique en raison de leurs propriétés diélectriques et électromécaniques. L'objet de l'étude est la recherche de céramiques PZT dur possédant des caractéristiques stables et reproductibles en fonction de la température et de la contrainte et sans comportement hystérétique. Ces spécificités sont requises pour des dispositifs tournant à grande vitesse comme les gyromètres et les gyroscopes vibrants qui peuvent être soumis à des variations de température importantes et dans lesquels les céramiques subissent des contraintes mécaniques élevées. Pour cette application particulière, le matériau doit également présenter une faible permittivité diélectrique relative (er
Book Synopsis Caractérisation électromécanique et modélisation de céramiques ferroélectriques de type PZT by : Olivier Guillon
Download or read book Caractérisation électromécanique et modélisation de céramiques ferroélectriques de type PZT written by Olivier Guillon and published by . This book was released on 2003 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans certaines applications, les céramiques ferroélectriques massives de type PZT adoptent un comportement hystérétique. Ceci pose des problèmes de fiabilité et de durabilité pour ces matériaux électroactifs. Grâce à la réalisation de montages adaptés, la réponse électromécanique d'une céramique douce à des sollicitations mécaniques complexes a pu être mesurée. En compression, les chargements répétés progressifs permettent de caractériser l'activité ferroélastique, c'est-à-dire la proportion de domaines ferroélectriques réorientés par la contrainte. Sans influence qualitative, l'état de polarisation joue de manière quantitative sur l'amplitude de ces phénomènes. Sous sollicitations cycliques, le matériau s'accomode au bout d'une dizaine de cycles. Si la vitesse de chargement ne semble pas modifier son comportement, on observe toutefois une variation de la déformation en fonction du temps sous contrainte imposée. Ces effets de fluage sont directement liés au taux de domaines réorientables par l'effort. Par ailleurs, l'influence des conditions aux limites électriques a été mise en évidence en compression et en traction, lorsque la polarisation est perpendiculaire à la contrainte. Les résultats expérimentaux uniaxiaux servent à l'identification des paramètres d'un modèle phénoménologique non-linéaire. Celui-ci définit des lois d'évolution viscoplastiques des variables macroscopiques. Pour finir, une étude de la rupture en traction a été réalisée sur plusieurs nuances dures et douces de PZT. Une approche statistique évaluant les paramètres de la loi de Weibull ainsi que l'observation des faciès de rupture montrent que la composition chimique semble avoir un rôle important dans le comportement à rupture de cette famille de céramiques.
Book Synopsis Céramiques piézoélectriques sans plomb by : Hamza Lidjici
Download or read book Céramiques piézoélectriques sans plomb written by Hamza Lidjici and published by Editions Universitaires Europeennes. This book was released on 2012 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail constitue une contribution a l'etude de materiaux ferroelectriques exempts de plomb dont l'importance est en train de devenir de plus en plus grande pour des raisons a la fois de sante publique et d'environnement. Il s'agit ici, d'elaborer et caracteriser des materiaux ceramiques Na0,5Bi0,5TiO3 (BNT) substitues par le titanate de baryum BaTiO3 (BT) afin d'obtenir des materiaux piezoelectriques exempts de plomb susceptibles de remplacer avantageusement les ceramiques PZT dans certaines applications particulieres. L'etude par diffraction des rayons X a permis de confirmer l'existence, a la temperature ambiante, d'une zone de transformation morphotropique (MPB) ou coexistent la symetrie rhomboedrique (BNT) et la symetrie quadratique (BT). Cette zone a ete estimee entre x=0.05 et x=0.07 (MPB(x) =0.05-0.07). L'etude des proprietes piezoelectriques et electromecaniques a la temperature ambiante revele des caracteristiques interessantes. En particulier, les resultats font ressortir que les meilleures caracteristiques ont ete obtenues pour x=0.065 (composition morphotropique).Il en resulte que ces ceramiques peuvent etre utilisees dans les applications piezoelectriques.
Book Synopsis Elaboration et caractérisation de céramiques PZT bi-substituées et modélisation non-linéaire de leur comportement en contrainte et en champ électrique by : Eric Boucher
Download or read book Elaboration et caractérisation de céramiques PZT bi-substituées et modélisation non-linéaire de leur comportement en contrainte et en champ électrique written by Eric Boucher and published by . This book was released on 2002 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les oxydes formulés Pb(ZrTi)O3 (noté PZT) de structure perovskite sont utilisés industriellement dans les transducteurs et capteurs piézoélectriques en raison de leurs propriétés diélectriques et électromécaniques. Cependant pour des applications bien spécifiques, il est nécessaire de développer des céramiques possédant des caractéristiques stables et reproductibles en fonction de la température et de la contrainte mécanique. Pour atteindre ces objectifs, nous avons élaboré par voie liquide et caractérisé de nouveaux matériaux PZT fluorés. Nous avons également étudié du coefficient N33 durant un cycle thermique et du coefficient d33 sous contrainte mécanique. Cette étude vise à déterminer l'influence de la fluoration sur le comportement diélectrique et électromécanique des céramiques PZT bi-substituées. Ensuite, nous avons étudié les effets d'un champ électrique et d'une contrainte mécanique sur la polarisation macroscopique afin d'appréhender les mécanismes de polarisation / dépolarisation sous haut niveau de sollicitations. Ceci nous a permis de développer un modèle, basé sur des éléments non linéaires, permettant de simuler les effets.
Book Synopsis Elaboration et caractérisations diélectriques de céramiques de type LiTaO3 by : Hyun Bin In
Download or read book Elaboration et caractérisations diélectriques de céramiques de type LiTaO3 written by Hyun Bin In and published by . This book was released on 1990 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: DES CERAMIQUES FERROELECTRIQUES DE TYPE LINBO#3 OU LITAO#3 ONT ETE SYNTHETISEES ET CARACTERISEES. UNE ETUDE COMPARATIVE DES PROPRIETES PYROELECTRIQUES DE CES MATERIAUX A ETE REALISEE. UNE ETUDE DIELECTRIQUE EN TEMPERATURE ET EN FREQUENCE A MONTRE QUE CERTAINS D'ENTRE EUX PRESENTENT DES RELAXATIONS DUES A LA REORIENTATION DE LA POLARISATION
Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Book Synopsis X-Ray and Neutron Reflectivity: Principles and Applications by : Jean Daillant
Download or read book X-Ray and Neutron Reflectivity: Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Book Synopsis Prussian Blue-type Nanoparticles and Nanocomposites by : Yannick Guari
Download or read book Prussian Blue-type Nanoparticles and Nanocomposites written by Yannick Guari and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanochemistry tools aid the design of Prussian blue and its analogue nanoparticles and nanocomposites. The use of such nanomaterials is now widely regarded as an alternative to other inorganic nanomaterials in a variety of scientific applications. This book, after addressing Prussian blue and its analogues in a historical context and their numerous applications over time, compiles and details the latest cutting-edge scientific research on these nanomaterials. It compiles and deatils the latest cutting-edge scientific research on these nanomaterials. The book provides an overview of the methodological concepts of the nanoscale synthesis of Prussian blue and its analogues, as well as the study and understanding of their properties and of the extent and diversity of application fields in relation to the major societal challenges of the 21st century on energy, environment, and health.
Book Synopsis Nonlinear Optical Materials by : Jerome V. Moloney
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Book Synopsis Materials Syntheses by : Ulrich Schubert
Download or read book Materials Syntheses written by Ulrich Schubert and published by Springer Science & Business Media. This book was released on 2008-11-23 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials syntheses are more complex than syntheses of inorganic or organic compounds. Materials synthesis protocols often suffer from unclarities, irreproducibility, lack in detail and lack in standards. The need to change this situation is the main motivation for this book. It collects a number of detailed protocols, ranging from organic polymers to carbonaceous and ceramic materials, from gels to porous and layered materials and from powders and nanoparticles to films.
Book Synopsis Sol-Gel Materials by : John D. Wright
Download or read book Sol-Gel Materials written by John D. Wright and published by CRC Press. This book was released on 2018-10-03 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sol-Gel processing methods, first used historically for decorative and constructional materials, were extensively developed in the last century for applications such as glasses, ceramics, catalysts, coatings, composites and fibres. Today they are reaching their full potential, enabling the preparation of new generations of advanced materials not easily accessible by other methods yet using mild, low-energy conditions. The topic is therefore increasingly included in advanced undergraduate, MSc and PhD programmes in the areas of chemistry, physics and materials science. This concise introductory text, written at the advanced undergraduate/first-year postgraduate level, is also suitable as an introduction to the development, mechanisms, chemistry, characterisation methods and applications of the technique. It provides readers with an extensive yet concise grounding in the theory of each area of the subject and details the real and potential applications and the future prospects of sol-gel chemistry.
Book Synopsis Recent Developments in Polymer Macro, Micro and Nano Blends by : P.M. Visakh
Download or read book Recent Developments in Polymer Macro, Micro and Nano Blends written by P.M. Visakh and published by Woodhead Publishing. This book was released on 2016-08-24 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent Developments in Polymer Macro, Micro and Nano Blends: Preparation and Characterisation discusses the various types of techniques that are currently used for the characterization of polymer-based macro, micro, and nano blends. It summarizes recent technical research accomplishments, emphasizing a broad range of characterization methods. In addition, the book discusses preparation methods and applications for various types of polymer-based macro, micro, and nano blends. Chapters include thermoplastic-based polymer & nano blends, applications of rubber based and thermoplastic blends, micro/nanostructures polymer blends containing block copolymers, advances in polymer-inorganic hybrids as membrane materials, synthesis of polymer/inorganic hybrids through heterophase polymerizations, nanoporous polymer foams from nanostructured polymer blends, and natural polymeric biodegradable nano blends for protein delivery. Describes the techniques pertaining to a kind (or small number) of blends, showing specific examples of their applications Covers micro, macro, and nano polymer blends Contains contributions from leading experts in the field
Book Synopsis High Temperature Superconductivity 2 by : Anant V. Narlikar
Download or read book High Temperature Superconductivity 2 written by Anant V. Narlikar and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: In contrast to research on the fundamental mechanisms of High-Temperature Superconductivity, in recent years we have seen enormous developments in the fabrication and application of High-Tc-superconductors. The two volumes of High Temperature Superconductivity provide a survey of the state of the technology and engineering applications of these materials. They comprise extended original research papers and technical review articles written by physicists, chemists, materials scientists and engineers, all of them noted experts in their fields. The interdisciplinary and strictly application-oriented coverage should benefit graduate students and academic researchers in the mentioned areas as well as industrial experts. Volume 1 "Materials" focuses on major technical advancements in High-Tc materials processing for applications. Volume 2 "Engineering Applications" covers numerous application areas where High-Tc superconductors are making tremendous impact.
