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Cristaux Et Polycristaux A Transition De Spin
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Book Synopsis Cristaux et polycristaux à transition de spin by : Elodie Tailleur
Download or read book Cristaux et polycristaux à transition de spin written by Elodie Tailleur and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une large hystérèse centrée autour de la température ambiante constitue l'un des objectifs principaux de la recherche sur les matériaux commutables fonctionnels. Dans le domaine très étudié de la conversion de spin, un tel comportement apparaît très rarement. Un nouveau composé, le complexe [Fe(PM-PeA)2(NCSe)2] présentant une large hystérèse autour de la température ambiante a été synthétisé, sous forme de monocristal et de poudre. Ce composé a été la base de deux axes de recherche. Le premier concerne l'étude multi-échelles des relations structure-propriétés en combinant la diffraction des rayons X sur poudre et sur monocristal, à température variable. Un focus tout particulier a été fait sur l'échelle microstructurale, très peu explorée à ce jour. Pour la première fois,la taille des domaines cohérents et le taux de microdéformations, ont été quantifiés pour un composé moléculaire discret à conversion de spin. Le deuxième axe concerne l'investigation de la transition de spin induite par la pression. L'étude in situ par diffraction des rayons X sur monocristal a permis une caractérisation complète de la structure cristalline des deux états de spin, sous pression. Par la suite, un suivi fin de la transition de spin, révélant une piezo-hystérèse, a été fait grâce à la diffraction des rayons X sur poudre, sous pression in situ à l'aide du rayonnement synchrotron. Les expériences couplant pression et température ont donné accès à des informations cruciales, telles que la variation des modules d'élasticité avec la température, les effets de la température sur la pression de transition, le caractère coopératif de la transition et la largeur de la piezo-hystérèse.
Book Synopsis Etude par R.P.E. des transitions de spin de l'ion Fe2+ dans les cristaux polymères ([Fe(NH2trz)3](NO3)2) et moléculaires ([Fe(PM-BiA)2(NCS)2];[Fe(PM-PEA)2(NCS)2]) by : Hervé Daubric
Download or read book Etude par R.P.E. des transitions de spin de l'ion Fe2+ dans les cristaux polymères ([Fe(NH2trz)3](NO3)2) et moléculaires ([Fe(PM-BiA)2(NCS)2];[Fe(PM-PEA)2(NCS)2]) written by Hervé Daubric and published by . This book was released on 2001 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: La résonance paramagnétique électronique (R.P.E.) est étudiée dans trois composés à transition de spin contenant du Fe2+ : un composé polymère fer(II)-1,2,4-triazole [Fe(NH2trz)3](NO3)2 dopé au cuivre ou au manganèse et deux composés moléculaires [Fe(PM-PEA)2(NCS)2] et [Fe(PM BiA)2(NCS)2] dopés au manganèse. Dans [Fe(NH2trz)3](N03)2, on a pu mettre en évidence l'existence d'une distribution gaussienne de la différence d'énergie [Delta] entre les vallées inférieures et supérieures des surfaces d'énergie Jahn-Teller, due au désordre de structure cristalline. Pour [Fe(PM-PEA)2(NCS)2], la R.P.E. confirme que la transition de spin est accompagnée par une transformation de phase cristalline et a lieu avec la formation de domaines d'ions possédant un spin identique. Un programme de simulation des spectres de R.P.E. de l'ion Mn2+ a été élaboré afin d'obtenir des données sur les modifications structurales au cours de la transition de spin. Les spectres de R.P.E. de [Fe(PM-BiA)2(NCS)2] en fonction de la température indiquent qu'une coopérativité considérable entre les ions métalliques dans ce composé. Les variations en température du paramètre D de structure fine ont été liées aux transformations de la structure cristalline en utilisant le modèle de superposition de Newman perfectionné pour tenir compte des contributions de la dilatation thermique du réseau cristallin et des vibrations de celui-ci. Nous avons également élaboré sur ce composé la première étude de l'effet LIESST (Light-Induced Excited Spin State Trapping) par la R.P.E. avec une irradiation directe dans la cavité micro-onde. Les résultats obtenus correspondent exactement aux prédictions du modèle de superposition.
Book Synopsis Finite Plastic Deformation of Crystalline Solids by : K. S. Havner
Download or read book Finite Plastic Deformation of Crystalline Solids written by K. S. Havner and published by Cambridge University Press. This book was released on 1992-03-27 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description
Book Synopsis Magnetostriction Theory and Applications of Magnetoelasticity by : Etienne Du Trémolet de Lacheisserie
Download or read book Magnetostriction Theory and Applications of Magnetoelasticity written by Etienne Du Trémolet de Lacheisserie and published by CRC Press. This book was released on 1993-06-09 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This outstanding reference provides a comprehensive discussion of magnetoelasticity based on three accepted descriptions of magnetostriction: elastomagnetic matrices, a group symmetrical description, and a tensor formalism. It explores recent advances that rely mainly on Callen's work and emphasizes the influence of temperature, stress, and composition on the Joule magnetostriction of soft ferromagnets. The author offers a comprehensive examination of magnetoelastic effects useful for a variety of significant applications, including the Villari-, direct and inverse Wiedemann-, Matteuci-, ?E-, and invar-effects. This vital work also addresses fundamental topics, including pressure dependence of the Curie temperature, form effect, and magnetostriction in paramagnets, diamagnets, superconductors, and antiferromagnets. The last chapter is devoted to technical aspects such as experimental methods, technically useful materials (e.g., Terfenol-D and 2605SC Metglas), and various illustrative applications. Magnetostriction is one reference no physicist, materials scientist, or geophysicist should be without.
Download or read book Properties of UO2 written by J. Belle and published by . This book was released on 1957 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1988 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Theory of X-Ray Diffraction in Crystals by : William H. Zachariasen
Download or read book Theory of X-Ray Diffraction in Crystals written by William H. Zachariasen and published by Dover Publications. This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This classic by one of the great figures in x-ray structure analysis provides a vigorous mathematical treatment of its subject. Addresses such fundamentals as crystal faces and edges, the lattice postulate, lattice rows and panes, as well as point, translation, and space groups. 1945 edition.
Download or read book Satellite Situation Report written by and published by . This book was released on 1978-12 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Canadian Journal of Biochemistry by :
Download or read book Canadian Journal of Biochemistry written by and published by . This book was released on 1973 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis The Optical Principles of the Diffraction of X-rays by : R. W. James
Download or read book The Optical Principles of the Diffraction of X-rays written by R. W. James and published by . This book was released on 1967 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Texture Analysis in Materials Science by : H.-J. Bunge
Download or read book Texture Analysis in Materials Science written by H.-J. Bunge and published by Elsevier. This book was released on 2013-09-03 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: Texture Analysis in Materials Science Mathematical Methods focuses on the methodologies, processes, techniques, and mathematical aids in the orientation distribution of crystallites. The manuscript first offers information on the orientation of individual crystallites and orientation distributions. Topics include properties and representations of rotations, orientation distance, and ambiguity of rotation as a consequence of crystal and specimen symmetry. The book also takes a look at expansion of orientation distribution functions in series of generalized spherical harmonics, fiber textures, and methods not based on the series expansion. The publication reviews special distribution functions, texture transformation, and system of programs for the texture analysis of sheets of cubic materials. The text also ponders on the estimation of errors, texture analysis, and physical properties of polycrystalline materials. Topics include comparison of experimental and recalculated pole figures; indetermination error for incomplete pole figures; and determination of the texture coefficients from anisotropie polycrystal properties. The manuscript is a dependable reference for readers interested in the use of mathematical aids in the orientation distribution of crystallites.
Download or read book Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.
Book Synopsis Formability of Metallic Materials by : D. Banabic
Download or read book Formability of Metallic Materials written by D. Banabic and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: After a brief introduction into crystal plasticity,the fun- damentals of crystallographic textures and plastic anisotro- py, a main topic of this book, are outlined. A large chapter is devoted to formability testing both for bulk metal and sheet metal forming. For the first time testing methods for plastic anisotropy of round bars and tubes are included. A profound survey is given of literature about yield criteria for anisotropic materials up to most recent developments and the calculation of forming limits of anisotropic sheet me- tal. Other chapters are concerned with properties of workpieces after metal forming as well as the fundamentals of the theory of plasticity and finite element simulation of metal forming processes. The book is completed by a collection of tables of international standards for formability testing and of flow curves of metals which are most commonly used in metal forming. It is addressed both to university and industrial readers.
Book Synopsis Crystal Physics by : German Stepanovich Zhdanov
Download or read book Crystal Physics written by German Stepanovich Zhdanov and published by . This book was released on 1965 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sheet Metal Forming Processes by : Dorel Banabic
Download or read book Sheet Metal Forming Processes written by Dorel Banabic and published by Springer Science & Business Media. This book was released on 2010-06-21 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of virtual manufacturing has been developed in order to increase the industrial performances, being one of the most ef cient ways of reducing the m- ufacturing times and improving the quality of the products. Numerical simulation of metal forming processes, as a component of the virtual manufacturing process, has a very important contribution to the reduction of the lead time. The nite element method is currently the most widely used numerical procedure for s- ulating sheet metal forming processes. The accuracy of the simulation programs used in industry is in uenced by the constitutive models and the forming limit curves models incorporated in their structure. From the above discussion, we can distinguish a very strong connection between virtual manufacturing as a general concept, ?nite element method as a numerical analysis instrument and constitutive laws,aswellas forming limit curves as a speci city of the sheet metal forming processes. Consequently, the material modeling is strategic when models of reality have to be built. The book gives a synthetic presentation of the research performed in the eld of sheet metal forming simulation during more than 20 years by the members of three international teams: the Research Centre on Sheet Metal Forming—CERTETA (Technical University of Cluj-Napoca, Romania); AutoForm Company from Zürich, Switzerland and VOLVO automotive company from Sweden. The rst chapter presents an overview of different Finite Element (FE) formu- tions used for sheet metal forming simulation, now and in the past.
2) et moléculaires ([Fe(PM-BiA)2(NCS)2];[Fe(PM-PEA)2(NCS)2]) PDF Online Free](https://books.google.com/books/content/images/frontcover/HjaGtgAACAAJ?fife=w200-h370)
