Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download MAGNETISME DES FULLERENES INTERCALES PDF full book. Access full book title MAGNETISME DES FULLERENES INTERCALES by Jérôme Robert. Download full books in PDF and EPUB format.
Author: Jérôme Robert Publisher: ISBN: Category : Languages : fr Pages : 211
Book Description
LE BUT DE CETTE THESE EST L'ETUDE PAR RESONANCE PARAMAGNETIQUE ELECTRONIQUE (RPE) EN ONDE CONTINUE ET PULSEE DES COMPOSES D'INTERCALATION DU FULLERENE. DANS L'ETAT NORMAL, LA SUSCEPTIBILITE RPE DES COMPOSES SUPRACONDUCTEURS K3C60 ET RB3C60 PERMET DE CALCULER LA DENSITE D'ETATS AU NIVEAU FERMI. L'ETUDE DE SA VARIATION THERMIQUE, ASSOCIEE A LA CONTRACTION THERMIQUE DU RESEAU PERMET DE DETERMINER CERTAINS PARAMETRES DE L'ETAT SUPRACONDUCTEUR DANS LE CADRE DE LA THEORIE BCS, COMME L'ENERGIE CARACTERISTIQUE DES PHONONS, LE COUPLAGE ELECTRON-PHONON ET LA REPULSION COULOMBIENNE. L'ABSENCE DES COMPOSES K1C60 ET RB1C60 DANS LE PREMIER DIAGRAMME DE PHASE EST DU A LEUR DETECTION DIFFICILE SUR LES CLICHES DE DIFFRACTION DES RAYONS X ET A LEUR INSTABILITE A TEMPERATURE AMBIANTE. SUIVANT LE TRAITEMENT THERMIQUE, ILS SE PRESENTENT SOUS TROIS PHASES: UNE PHASE STABLE CUBIQUE FACES CENTREES HAUTE TEMPERATURE, UNE PHASE POLYMERE ORTHORHOMBIQUE (O.P) STABLE AVEC LE RUBIDIUM ET METASTABLE AVEC LE POTASSIUM EN DESSOUS DE 350 KELVIN ET UNE PHASE METASTABLE DIMERE QUASI-ORTHORHOMBIQUE (O.D) OBTENUE PAR TREMPE DE LA PHASE CFC. CHAQUE PHASE PRESENTE SES PROPRES CARACTERISTIQUES RPE, CE QUI NOUS PERMET DE CIRCONSCRIRE LES REGIONS DE STABILITE THERMIQUE ET D'IDENTIFIER LES TRANSFORMATIONS DE PHASE. UNE ETUDE CINETIQUE EN FONCTION DE LA TEMPERATURE QUANTIFIE L'ENERGIE IMPLIQUEE DANS CES TRANSFORMATIONS DE PHASES. LES EXPERIENCES DE RPE A IMPULSIONS CONFIRMENT LE CARACTERE METALLIQUE DU POLYMERE RB1C60. ENFIN, NOUS INTERPRETONS LA TRANSITION METAL-ISOLANT QUE SUBIT CE COMPOSE A BASSE TEMPERATURE. AU DELA DES PROPRIETES ISOLANTES COMMUNE DES COMPOSES K4C60, NA2C60 ET NA9.8C60. NOUS CONSTATONS QUE LA VARIATION EN FONCTION DE LA TEMPERATURE DE LA SUSCEPTIBILITE RPE TRADUIT UN EQUILIBRE SINGULET FONDAMENTAL-TRIPLET, DONT L'ECART EST LUI-MEME VARIABLE AVEC LA TEMPERATURE POUR LES DEUX PREMIERS COMPOSES. LE ROLE DES MODES DE PHONONS INTRAMOLECULAIRES EST INVOQUE POUR EXPLIQUER CE PHENOMENE
Author: Jérôme Robert Publisher: ISBN: Category : Languages : fr Pages : 211
Book Description
LE BUT DE CETTE THESE EST L'ETUDE PAR RESONANCE PARAMAGNETIQUE ELECTRONIQUE (RPE) EN ONDE CONTINUE ET PULSEE DES COMPOSES D'INTERCALATION DU FULLERENE. DANS L'ETAT NORMAL, LA SUSCEPTIBILITE RPE DES COMPOSES SUPRACONDUCTEURS K3C60 ET RB3C60 PERMET DE CALCULER LA DENSITE D'ETATS AU NIVEAU FERMI. L'ETUDE DE SA VARIATION THERMIQUE, ASSOCIEE A LA CONTRACTION THERMIQUE DU RESEAU PERMET DE DETERMINER CERTAINS PARAMETRES DE L'ETAT SUPRACONDUCTEUR DANS LE CADRE DE LA THEORIE BCS, COMME L'ENERGIE CARACTERISTIQUE DES PHONONS, LE COUPLAGE ELECTRON-PHONON ET LA REPULSION COULOMBIENNE. L'ABSENCE DES COMPOSES K1C60 ET RB1C60 DANS LE PREMIER DIAGRAMME DE PHASE EST DU A LEUR DETECTION DIFFICILE SUR LES CLICHES DE DIFFRACTION DES RAYONS X ET A LEUR INSTABILITE A TEMPERATURE AMBIANTE. SUIVANT LE TRAITEMENT THERMIQUE, ILS SE PRESENTENT SOUS TROIS PHASES: UNE PHASE STABLE CUBIQUE FACES CENTREES HAUTE TEMPERATURE, UNE PHASE POLYMERE ORTHORHOMBIQUE (O.P) STABLE AVEC LE RUBIDIUM ET METASTABLE AVEC LE POTASSIUM EN DESSOUS DE 350 KELVIN ET UNE PHASE METASTABLE DIMERE QUASI-ORTHORHOMBIQUE (O.D) OBTENUE PAR TREMPE DE LA PHASE CFC. CHAQUE PHASE PRESENTE SES PROPRES CARACTERISTIQUES RPE, CE QUI NOUS PERMET DE CIRCONSCRIRE LES REGIONS DE STABILITE THERMIQUE ET D'IDENTIFIER LES TRANSFORMATIONS DE PHASE. UNE ETUDE CINETIQUE EN FONCTION DE LA TEMPERATURE QUANTIFIE L'ENERGIE IMPLIQUEE DANS CES TRANSFORMATIONS DE PHASES. LES EXPERIENCES DE RPE A IMPULSIONS CONFIRMENT LE CARACTERE METALLIQUE DU POLYMERE RB1C60. ENFIN, NOUS INTERPRETONS LA TRANSITION METAL-ISOLANT QUE SUBIT CE COMPOSE A BASSE TEMPERATURE. AU DELA DES PROPRIETES ISOLANTES COMMUNE DES COMPOSES K4C60, NA2C60 ET NA9.8C60. NOUS CONSTATONS QUE LA VARIATION EN FONCTION DE LA TEMPERATURE DE LA SUSCEPTIBILITE RPE TRADUIT UN EQUILIBRE SINGULET FONDAMENTAL-TRIPLET, DONT L'ECART EST LUI-MEME VARIABLE AVEC LA TEMPERATURE POUR LES DEUX PREMIERS COMPOSES. LE ROLE DES MODES DE PHONONS INTRAMOLECULAIRES EST INVOQUE POUR EXPLIQUER CE PHENOMENE
Author: W. Andreoni Publisher: Springer Science & Business Media ISBN: 9401140383 Category : Science Languages : en Pages : 457
Book Description
Krätschmer and Huffman's revolutionary discovery of a new solid phase of carbon, solid C60, in 1990 opened the way to an entire new class of materials with physical properties so diverse that their richness has not yet been fully exploited. Moreover, as a by-product of fullerene research, carbon nanotubes were later identified, from which novel nanostructures originated that are currently fascinating materials scientists worldwide. Rivers of words have been written on both fullerenes and nanotubes, in the form of journal articles, conference proceedings and books. The present book offers, in a concise and self-contained manner, the basics of the science of these materials as well as detailed information on those aspects that have so far been better explored. Structural, electronic and dynamical properties are described as obtained from various measurements and state-of-the-art calculations. Their interrelation emerges as well as their possible dependence on, for example, preparation conditions or methods of investigation. By presenting and comparing data from different sources, experiment and theory, this book helps the reader to rapidly master the basic knowledge, to grasp important issues and critically discuss them. Ultimately, it aims to inspire him or her to find novel ways to approach still open questions. As such, this book is addressed to new researchers in the field as well as experts.
Author: K. Prassides Publisher: Springer Science & Business Media ISBN: 9401109842 Category : Science Languages : en Pages : 348
Book Description
In September 1985, in an attempt to simulate the chemistry in a carbon star, Harry Kroto, Bob Curl and Richard Smalley set up a mass spectrometry experiment to study the plasma produced by focusing a pulsed laser on solid graphite. Serendipitously, a dominant 720 amu mass peak corresponding to a C60 species was revealed in the time-of-flight mass spectrum of the resulting carbon clusters. It was proposed that this C60 cluster had the closed cage structure of a truncated icosahedron (a soccerball) and was named Buckminsterfullerene because geodesic dome concepts, pioneered by the architect Buckminster Fuller, played an important part in arriving at this solution. The signal for a C70 species (840 amu) , proposed to have the ellipsoidal shape of a rugbyball, was also prominent in the early experiments. Five years later, the seminal work of the Sussex! Rice collaboration was triumphantly confirmed as Wolfgang Krlitschmer and Donald Huffman succeeded in producing, and separating, bulk crystalline samples of fullerene material from arc-processed (in an inert gas atmosphere) carbon deposits. From then onwards, fullerene research continued, and still proceeds, at an exhilarating pace. The materials excited the imagination of many diverse classes of scientists, resulting in a truly interdisciplinary field. Many of our old, seemingly well-founded, preconceptions in carbon science had to be radically altered or totally abandoned, as a new round world of chemistry, physics and materials science began to unfold.
Author: Natalia Kamanina Publisher: BoD – Books on Demand ISBN: 1789230225 Category : Science Languages : en Pages : 156
Book Description
In the period of rapid and intensive development of general electronics, this book entitled Fullerenes and Relative Materials - Properties and Applications is quite systematic and useful. It considers some aspects on synthesis, structural, vibrational, tribology, and optical properties of the fullerenes and relative materials. Some parts of the book present the specific area of the applications of the studied nanostructures. The book contains eight chapters. The special approach and interesting results on the unique properties of the materials studied as well as the different areas of their applications in general optoelectronics, solar energy and gas storage, laser and display, and biomedicine are shown. It is important for education process and for the civil and special device operations.
Author: Electrochemical Society. Fullerenes Group Publisher: The Electrochemical Society ISBN: 9781566772761 Category : Dielectrics Languages : en Pages : 292
Book Description
L'INTERCALATION DES METAUX ALCALINS ET ALCALINO-TERREUX DANS LA MATRICE CUBIQUE FACES CENTREES DU FULLERENE C#6#0 A MOBILISE JUSQU'A PRESENT UNE PART IMPORTANTE DES EFFORTS DE RECHERCHE. PAS OU PEU D'ATTENTION A ETE PORTEE EN CE QUI CONCERNE L'INTERCALATION DES ELEMENTS DE LA SERIE 4F, SUSCEPTIBLE DE CONDUIRE A LA FORMATION DE NOUVEAUX COMPOSES MAGNETIQUES OU SUPRACONDUCTEURS. UN MODELE THERMODYNAMIQUE SIMPLE SUPPOSANT UN TRANSFERT DE CHARGE COMPLET ENTRE LA TERRE RARE ET LE FULLERENE A PERMIT DE FOCALISER CETTE ETUDE SUR LES COMPOSES HYPOTHETIQUES EU#3C#6#0, SM#3C#6#0 ET YB#3C#6#0. CES NOUVELLES PHASES PREPAREES PAR VOIE SOLIDE A 550C ONT ETE CARACTERISEES PAR LES TECHNIQUES DE DIFFRACTION DES RAYONS X A TRES HAUTE RESOLUTION (UTILISATION DU RAYONNEMENT SYNCHROTRON). L'ORIGINALITE ET LA COMPLEXITE DE LA STRUCTURE REPOSE SUR L'EXISTENCE D'UNE LACUNE INTERSTITIELLE ORDONNEE A LONGUE DISTANCE, RESPONSABLE DU DOUBLEMENT DE LA MAILLE DANS LES TROIS DIRECTIONS CRISTALLOGRAPHIQUES. L'ETUDE DETAILLEE DES PROPRIETES MAGNETIQUES A REVELE LA VALENCE MIXTE DE L'EUROPIUM DANS LE CAS DES COMPOSES EU#3C#6#0 ET EU#6C#6#0. L'HYSTERESIS ET LA RELAXATION EXPONENTIELLE DE L'AIMANTATION DANS EU#3C#6#0 A ETE ATTRIBUEE A L'EXISTENCE DE PETITES PARTICULES MAGNETIQUES REGULIEREMENT ESPACEES CONSTITUEES DE DEUX OU TROIS ATOMES D'EUROPIUM A PEINE. LE COMPOSE EU#6C#6#0 DONT LA STRUCTURE REPOSE SUR L'OCCUPATION UNITAIRE DE TOUS LES INTERSTICES D'UN SOUS RESEAU CUBIQUE CENTRE DU C#6#0 SE CARACTERISE PAR DES CORRELATIONS FERROMAGNETIQUES AU VOISINAGE DE 65 K.
Author: Peter W Stephens Publisher: World Scientific ISBN: 9814505242 Category : Technology & Engineering Languages : en Pages : 258
Book Description
The creation of the hollow carbon buckminsterfullerene molecule as well as methods to produce and purify bulk quantities of it has triggered an explosive growth of research in the field. Superconducting and magnetic fullerides, atoms trapped inside the fullerene cage, chemically bonded fullerene complexes, and nanometer-scale helical carbon tubes are some of the leading areas that have generated much excitement.This book is intended as a guide to the literature for the scientist who is just entering fullerene research, and will be one more valuable volume to the collection for the established worker. It contains reprints of some sixty most important research papers, with focus especially on those papers that have guided further work in the field. There is also a short review of the field, with references to many other publications.
Author: Roger Taylor Publisher: World Scientific ISBN: 9789810236915 Category : Science Languages : en Pages : 292
Book Description
The closed-cage carbon molecules known as fullerenes provide an entirely new branch of chemistry, materials science, and physics. Fullerene research is now engaging the frenetic attention of thousands of scientists. Initially, the chemistry was relatively slow to develop due to the low availability of material, and the need for state-of-the-art instrumentation for product analysis. This research area is now very definitely up-and-running, and will soon become the main focus of attention in the fullerene field. The number of published papers already runs into hundreds, and the main features of fullerene reactivity have been established. This book describes all of the known types of reactions as well as the means of production, the purification, and the properties of fullerenes.
Author: Fernando Langa De La Puente Publisher: Royal Society of Chemistry ISBN: 1847557716 Category : Science Languages : en Pages : 411
Book Description
The discovery of caged carbon structures, in 1985, established a whole new field of carbon chemistry. Unlike graphite and diamond, these structures known as fullerenes are finite in structure and are relevant to a wide variety of fields including supramolecular assemblies, nanostructures, optoelectronic devices and a whole range of biological activities. Fullerenes: Principles and Applications discusses all aspects of this exciting field. Sections include: the basic principles for the chemical reactivity of fullerenes, electrochemistry, light induced processes, fullerenes for material sciences, fullerenes and solar cells, biological applications and multifunctional carbon nanotube materials. Written by leading experts in the field the book summarises the basic principles of fullerene chemistry but also highlights some of the most remarkable advances that have occurred in recent years. Fullerenes: Principles and Applications will appeal to researchers in both academia and industry.
Author: Jérôme Robert
Author: Jérôme Robert
Author: W. Andreoni
Author: K. Prassides
Author: Prashant V. Kamat
Author: Natalia Kamanina
Author: Electrochemical Society. Fullerenes Group
Author: YOUNAL.. KSARI HABILES
Author: Peter W Stephens
Author: Roger Taylor
Author: Fernando Langa De La Puente