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Vers Le Developpement De Materiaux A Transition De Spin
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Author :Olivier Sigouin Publisher :Montréal : Service des archives, Université de Montréal, Section Microfilm ISBN 13 : Total Pages :278 pages Book Rating :4.:/5 (68 download)
Book Synopsis Vers le développement de matériaux à transition de spin [microforme] : synthèse de différents complexes mono-oxo de rhénium (V) et étude de leur écart HOMO-LUMO by : Olivier Sigouin
Download or read book Vers le développement de matériaux à transition de spin [microforme] : synthèse de différents complexes mono-oxo de rhénium (V) et étude de leur écart HOMO-LUMO written by Olivier Sigouin and published by Montréal : Service des archives, Université de Montréal, Section Microfilm. This book was released on 2005 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vers le développement de matériaux à transition de spin by : Olivier Sigouin
Download or read book Vers le développement de matériaux à transition de spin written by Olivier Sigouin and published by . This book was released on 2004 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transition de spin photo-induite by : Nicolas Paradis
Download or read book Transition de spin photo-induite written by Nicolas Paradis and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'étude des matériaux à transition de spin constitue un important challenge du fait de leurspotentialités dans le traitement de l'information, notamment par voie optique. En effet, inscrire uneinformation par la lumière permet d'accéder à des vitesses de traitement extrêmement rapides. Leszones de stabilité de cette information photo-inscrite varient beaucoup avec la température. Cetravail de thèse a consisté à faire converger ces zones vers un même point via la rencontre entre lestransitions de spin thermique et photo-induite. Pour cela, nous avons utilisé deux approcheschimiques : la réalisation de solutions solides sur des systèmes très coopératifs et l'obtention denanoparticules photomagnétiques. Ce manuscrit détaille les résultats obtenus durant ce travail.
Book Synopsis Etudes Des Propriétés Électriques Des Matériaux À Transition de Spin by : Constantin Lefter
Download or read book Etudes Des Propriétés Électriques Des Matériaux À Transition de Spin written by Constantin Lefter and published by . This book was released on 2016 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: The central theme of this thesis is the evaluation of potential interest and applicability of molecular spin crossover (SCO) complexes for nanoelectronic applications. The electrical properties of the [Fe(Htrz)2(trz)](BF4) complex and its Zn substituted analogues were analyzed first in the bulk powder form using broadband dielectric spectroscopy. It has been shown that the ac and dc conductivities as well as the dielectric constant and the dielectric relaxation frequency exhibit an important drop when going from the low spin (LS) to the high spin (HS) state. The iron ions kept their spin transition properties in the Zn diluted samples, but the SCO curves were significantly altered. The Zn substitution of active iron centers led to an important decrease of the electrical conductivity of ca. 6 orders of magnitude (for Zn/Fe = 0.75). We concluded from these results that the ferrous ions directly participate to the charge transport process, which was analyzed in the frame of an activated hopping conductivity model. Micrometric particles of [Fe(Htrz)2(trz)](BF4) were then integrated by dielectrophoresis between interdigitated gold electrodes leading to a device exhibiting bistability in the I-V,T characteristics. The stability of the starting material and the electronic device were carefully controlled and the concomitant effect of temperature changes, light irradiation and voltage bias on the current intensity were analyzed in detail. We showed that the device can be preferentially addressed by light stimulation according to its spin state and the switching from the metastable HS to the stable LS state was also demonstrated by applying an electric field step inside the hysteresis loop. The field effects were discussed in the frame of static and dynamic Ising-like models, while the photo-induced phenomena were tentatively attributed to surface phenomena. The [Fe(bpz)2(phen)] complex was also investigated by dielectric spectroscopy in the bulk powder form and then integrated by high vacuum thermal evaporation into a large-area vertical device with Al (top) and ITO (bottom) electrodes. This approach allowed us to probe the spin-state switching in the SCO layer by optical means while detecting the associated resistance changes both in the tunneling (10 nm junction) and injection-limited (30 and 100 nm junctions) regimes. The tunneling current in the thin SCO junctions showed a drop when going from the LS to the HS state, while the rectifying behavior of the 'thick' junctions did not reveal any significant spin-state dependence. The ensemble of these results provides guidance with new perspectives for the construction of electronic and spintronic devices incorporating SCO molecular materials.
Book Synopsis Etude de la dépendance en taille des propriétés physiques des composés à transition de spin by : Mirko Mikolasek
Download or read book Etude de la dépendance en taille des propriétés physiques des composés à transition de spin written by Mirko Mikolasek and published by . This book was released on 2016 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sous l'influence de stimuli externes (température, irradiation lumineuse etc.), les matériaux à transition de spin peuvent commuter d'un état bas spin vers un état haut spin de manière réversible, entraînant une modification importante de leurs propriétés physiques (élastique, magnétique, optique etc.). De plus, dans les matériaux massifs, la transition de spin est souvent accompagnée d'un effet mémoire (cycle d'hystérésis). Toutes ces propriétés rendent ces matériaux moléculaires particulièrement attractifs pour des applications dans des dispositifs nanométriques. Cependant, ces propriétés sont généralement fortement dépendantes de la taille de l'objet. Cette dépendance peut mener à une perte du cycle d'hystérésis, une modification de la stabilité des phases et l'observation de transitions incomplètes. Ces phénomènes ont été étudiés à travers des approches de physique statistique et de thermodynamique mettant en exergue le rôle important des interfaces. Cette thèse se place dans la continuité de ces travaux et se focalise sur deux aspects. D'une part, une étude des surfaces et de leur relaxation à l'aide des modèles de type Ising et " spin-phonon " résolus numériquement (Monte Carlo, auto-convergence). Il est montré que les phénomènes de surface modifient en profondeur les propriétés du matériau, que le couplage entre surface et volume est d'autant plus important à l'approche de la transition et que ces inhomogénéités spatiales peuvent être à l'origine des transitions incomplètes observées. D'autre part, il est réalisé une étude expérimentale de la dynamique du réseau à l'aide de la diffusion nucléaire inélastique pour suivre l'évolution des propriétés élastiques et vibrationnelles avec la réduction de la taille à travers la densité d'états phononiques. Cette étude expérimentale est complétée par une étude théorique/numérique, à l'aide des techniques de la matrice dynamique et de la dynamique moléculaire. Les densités d'états vibrationnels de particules cubiques à motif octaédrique sont ainsi obtenues permettant d'appréhender les mécanismes de couplages des différents modes de vibration de l'octaèdre de coordination à l'état solide. Finalement, il est discuté des effets de confinement et de leurs conséquences sur les grandeurs liées à la dynamique du réseau telles que la vitesse du son.
Book Synopsis MATERIAUX MOLECULAIRES A TRANSITION DE SPIN POUR L'AFFICHAGE by : JONAS.. KROBER
Download or read book MATERIAUX MOLECULAIRES A TRANSITION DE SPIN POUR L'AFFICHAGE written by JONAS.. KROBER and published by . This book was released on 1994 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL DE THESE EST CONSACRE A L'ETUDE DU PHENOMENE DE TRANSITION DU SPIN (TS) DANS LES COMPOSES A BASE MOLECULAIRE CONTENANT DES IONS FE #I#I ENTOURES DE DERIVES 1,2,4-TRIAZOLES. LA TS SE MANIFESTE DANS CES COMPOSES PAR UN PASSAGE THERMOINDUIT DE L'ETAT FONDAMENTAL BAS-SPIN DIAMAGNETIQUE (BS OU S=0) VERS UN ETAT LEGEREMENT EXCITE PARAMAGNETIQUE HAUT-SPIN (HS OU S=2). CE PASSAGE EST ACCOMPAGNE D'UN EFFET THERMOCHROME IMPORTANT DU ROUGE VERS LE BLANC. UN DES BUTS PRINCIPAUX ETAIT L'UTILISATION DE CET EFFET THERMOCHROME AFIN DE REALISER DES DISPOSITIFS SERVANT AU STOCKAGE DE L'INFORMATION, LE PREMIER OBJECTIF ETANT DES DISPOSITIFS D'AFFICHAGE. A CETTE FIN, LES COMPOSES DOIVENT PRESENTER UNE LARGE HYSTERESIS THERMIQUE, DE L'ORDRE DE PLUSIEURS DIZAINES DE KELVIN ET IL EST CRUCIAL QUE CES EFFETS SE MANIFESTENT AUSSI PRES QUE POSSIBLE DE LA TEMPERATURE (T) AMBIANTE. UN PREMIER CANDIDAT POTENTIEL ETAIT LE COMPOSE FE(HTRZ)#2(TRZ)BF#4 OU HTRZ REPRESENTE LE 1,2,4-1H-TRIAZOLE ET TRZ LA BASE CORRESPONDANTE. CE COMPOSE PRESENTE UNE HYSTERESIS TRES LARGE, D'ENVIRON 50 K, AVEC DES TS TRES ABRUPTES (MOINS QUE 5 K). LES PROPRIETES DE LA TS DEPENDENT BEAUCOUP DE LA PREPARATION DU COMPOSE. LE COMPOSE NON DEPROTONE FE(HTRZ)#3(BF#4)#2 PRESENTE EN PLUS D'UNE HYSTERESIS PROCHE DE L'AMBIANTE UNE TRANSITION DE PHASE A 150C QUI DEPLACE LES T DE LA TS REVERSIBLEMENT EN DESSOUS DE L'AMBIANTE. POTENTIELLEMENT CE COMPOSE PERMET L'ACCES A DES HYSTERESIS DE 100 K. L'AJUSTEMENT DES T DE LA TS PAR DOPAGE PARTIEL DU LIGAND EST ETUDIE POUR LE COMPOSE FE(HTRZ)#3#-#3#(NH#2TRZ)#3#(CLO#4)#2 (NH#2TRZ=4-AMINO-1,2,4-TRIAZOLE) PRESENTANT POUR =0,05 UNE BOUCLE D'HYSTERESIS CENTREE AUTOUR DE LA T AMBIANTE. LE REMPLACEMENT DE LA SUBSTITUTION DE BF#4 PAR BR#- DANS LE COMPOSE FE(NH#2TRZ)#3(BF#4)#2 CONDUIT A UN DEPLACEMENT DE LA T DE LA TS AUTOUR DE L'AMBIANTE ET CELLE-CI DEVIENT BEAUCOUP PLUS ABRUPTE. TOUS CES COMPOSES ONT DES STRUCTURES POLYMERIQUES. ILS SE PRESENTENT SANS DOUTE SOUS FORME DE CHAINES. AFIN DE COMPRENDRE LES PROPRIETES PHYSIQUES DE CES COMPOSES QUI SONT ETROITEMENT LIEES A LEURS STRUCTURES, NOUS AVONS ETUDIE PAR DIFFRACTION DES RAYONS X LA STRUCTURE DE DEUX COMPOSES, ZNTRZC1, PRESENTANT UNE STRUCTURE LAMELLAIRE ET LE COMPOSE TRINUCLEAIRE FE#3(ME#2NTRZ)#6(H#2O)#6(CLO#4)#6 (ME#2NTRZ=4-DIMETHYLAMINO-1,2,4-TRIAZOLE). CERTAINS DES COMPOSES DECRITS DANS CETTE THESE ONT CONDUIT A DES DISPOSITIFS DEJA TRES PROCHES DU MARCHE. CETTE COMPOSANTE DE NOTRE TRAVAIL A ETE MENEE A BIEN EN COLLABORATION AVEC UN PARTENAIRE INDUSTRIEL
Book Synopsis Synthèse et étude de matériaux moléculaires à transition de spin by : Tatiana Nepotu Palamarciuc
Download or read book Synthèse et étude de matériaux moléculaires à transition de spin written by Tatiana Nepotu Palamarciuc and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce manuscrit présente la synthèse et la caractérisation de deux nouvelles familles de complexes mononucléaires, [Fe(L)2(NCS)2] et [Fe(L)(H2B(pz)2)2], montrant des propriétés bistables. L'étude des structures cristallographiques a permis de discuter l'influence de l'élongation des ligands L sur le réseau cristallin et sur les contacts intermoléculaires ainsi que l'existence de corrélations structures / propriétés. Enfin, la dernière partie de ce travail est consacrée à l'élaboration de façon contrôlée d'objets à transition de spin à l'échelle nanométrique, sous la forme de films déposés par sublimation et de nanoclusters synthétisés en milieu confiné.
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Book Synopsis Composite Materials by : Jean-Marie Berthelot
Download or read book Composite Materials written by Jean-Marie Berthelot and published by Springer. This book was released on 2013-02-06 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical engineering, an engineering discipline borne of the needs of the in dustrial revolution, is once again asked to do its substantial share in the call for industrial renewal. The general call is urgent as we face profound issues of produc tivity and competitiveness that require engineering solutions, among others. The Mechanical Engineering Series features graduate texts and research monographs intended to address the need for information in contemporary areas of mechanical engineering. The series is conceived as a comprehensive one that covers a broad range of concentrations important to mechanical engineering graduate education and re search. We are fortunate to have a distinguished roster of consulting editors on the advisory board, each an expert in one of the areas of concentration. The names of the consulting editors are listed on the next page of this volume. The areas of concentration are applied mechanics, biomechanics, computational mechan ics, dynamic systems and control, energetics, mechanics of materials, processing, thermal science, and tribology.
Book Synopsis Nanomagnetism and Spintronics by : Farzad Nasirpouri
Download or read book Nanomagnetism and Spintronics written by Farzad Nasirpouri and published by World Scientific. This book was released on 2011 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomagnetism and spintronics are two close subfields of nanoscience, explaining the effect of substantial magnetic properties of matter when the materials fabrication is realized at a comparable length size. Nanomagnetism deals with the magnetic phenomena specific to the structures having dimensions in the submicron range. The fact that the electronic transport properties of materials are dependent on the magnetic properties' artificial nanostructures, i.e., giant magnetoresistance (GMR) or tunneling magnetoresistance (TMR), has revolutionized spintronics science and technology. This book explains the concepts of nanomagnetism and spintronics by viewing the most recent research works from internationally distinguished research groups. Placing special emphasis on crucial fundamental and technical aspects of nanomagnetism and spintronics, it serves as a one-stop reference for universities offering postgraduate programs in nanotechnology or related disciplines. This unique book deals with all three stages required for conducting research in nanomagnetism and spintronics including fabrication, characterization and applications of nanomagnetic and spintronics materials, providing general concepts and an insightful overview of this subject for research students and scientists from different backgrounds investigating the multidisciplinary area of nanotechnology.
Book Synopsis Multifunctional Oxide Heterostructures by : Evgeny Y. Tsymbal
Download or read book Multifunctional Oxide Heterostructures written by Evgeny Y. Tsymbal and published by OUP Oxford. This book was released on 2012-08-30 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the rapidly developing field of oxide thin-films and heterostructures. Oxide materials combined with atomic-scale precision in a heterostructure exhibit an abundance of macroscopic physical properties involving the strong coupling between the electronic, spin, and structural degrees of freedom, and the interplay between magnetism, ferroelectricity, and conductivity. Recent advances in thin-film deposition and characterization techniques made possible the experimental realization of such oxide heterostructures, promising novel functionalities and device concepts. The book consists of chapters on some of the key innovations in the field over recent years, including strongly correlated oxide heterostructures, magnetoelectric coupling and multiferroic materials, thermoelectric phenomena, and two-dimensional electron gases at oxide interfaces. The book covers the core principles, describes experimental approaches to fabricate and characterize oxide heterostructures, demonstrates new functional properties of these materials, and provides an overview of novel applications.
Book Synopsis Optical Properties Of Graphene by : Rolf Binder
Download or read book Optical Properties Of Graphene written by Rolf Binder and published by World Scientific. This book was released on 2016-11-11 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive state-of-the-art overview of the optical properties of graphene. During the past decade, graphene, the most ideal and thinnest of all two-dimensional materials, has become one of the most widely studied materials. Its unique properties hold great promise to revolutionize many electronic, optical and opto-electronic devices. The book contains an introductory tutorial and 13 chapters written by experts in areas ranging from fundamental quantum mechanical properties to opto-electronic device applications of graphene.
Book Synopsis Heritage Sites of Astronomy and Archaeoastronomy in the Context of the UNESCO World Heritage Convention by : Clive L. N. Ruggles
Download or read book Heritage Sites of Astronomy and Archaeoastronomy in the Context of the UNESCO World Heritage Convention written by Clive L. N. Ruggles and published by Ocarina Books. This book was released on 2012 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Thematic Study is a joint venture between ICOMOS, the advisory body to UNESCO on cultural sites, and the International Astronomical Union. It presents an overall vision on astronomical heritage, attempts to identify what constitutes "outstanding universal significance to humankind" in relation to astronomy, and identifies broad issues that could arise in the assessment of cultural properties relating to astronomy. This is the first Thematic Study in any field of science heritage. It is elaborated using examples of properties from around the world, including some already on the World Heritage List or national Tentative Lists. The subject matter ranges from early prehistory to modern astrophysics and space heritage, and also prominently includes dark sky issues and modern observatory sites. An e-version of the Thematic Study was published in June 2010 in time to be presented to the 2010 meeting of UNESCO's World Heritage Committee, where it was duly approved. It has been circulated officially by the WHC to all of UNESCO's National Commissions. This full-colour paperback edition with some updates, and reformatted to new ICOMOS standards, was published in 2011 and is now offered for public sale.
Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Book Synopsis Innovate Bristol by : Sven Boermeester
Download or read book Innovate Bristol written by Sven Boermeester and published by . This book was released on 2019-12 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Innovate Bristol highlights and celebrates those companies and individuals that are actively working at building a better tomorrow for all. Innovation Ecosystems thrive through the involvement and support of companies and individuals from all industries, which is why the Innovate series not only focuses on the innovators but also those people whom the Innovation Ecosystem, would not be able to thrive without.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Magnetism: A Supramolecular Function by : O. Kahn
Download or read book Magnetism: A Supramolecular Function written by O. Kahn and published by Springer Science & Business Media. This book was released on 1996-07-31 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular magnetism is a new field of research dealing with the synthesis and study of the physical properties of molecular assemblies involving open-shell units. It is essentially interdisciplinary, joining together organic, organometallic and inorganic chemists, as well as theoreticians, physicists and materials scientists. At the core of research into molecular magnetism lie design and synthesis of new molecular assemblies exhibiting bulk properties such as long-range magnetic ordering or bistability with an hysteresis effect, which confers a memory effect on the system. In such terms, magnetism may be considered a supramolecular function. The first eight contributions to this volume present the state of the art in organic supramolecular chemistry, emphasising interlocked systems and molecular trees. The following six articles are devoted to molecular materials constructed from organic radicals and transition metal units. Molecular bistability is then focused on, followed by metal-organic and coordination magnetic materials. A new approach to nano-sized particles closes the work.
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