Дисертації з теми "Neutron diffraction technique"
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Voufack, Ariste Bolivard. "Modélisation multi-technique de la densité électronique." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0168/document.
Повний текст джерелаX-ray and neutron diffraction methods can be combined to determine simultaneously electron charge and spin densities in crystals based on spin resolved electron density model developed at CRM2. This method enables to carry out the study of interaction paths leading to the observed ferromagnetic order. First applications of this model were to coordination complexes, where the unpaired electron is mainly located on the transition metal, then generalized to explore organic radicals and to inorganic materials. In radical Nit(SMe)Ph, the modeling of the experimental charge and spin densities showed localization of spin density on O-N-C-N-O group (nitronyl -nitroxyde function), in agreement with previous works. It is also evidenced the involvement of the hydrogen bonds in the magnetic interactions leading to the ferromagnetic transition at very low temperature (0.6K). This study revealed dissymmetrical spin population of the two N-O groups that only CASSCF-type calculations can reproduce in amplitude (not DFT). This dissymmetry originates from both molecular and crystal effects. In radical p-O2NC6F4CNSSN belonging to the family of dithiadiazolyl, the joint refinement showed that the majority of the spin is distributed on -CNSSN group in agreement with the previous works. From topological properties of the charge density, halogen, chalcogen and π interactions have been highlighted. The most important magnetic interactions are observed through the network formed by contacts S ... N2 between neighboring molecules leading to the ferromagnetic order below 1.23K. Concerning the inorganic material, YTiO3, the charge densities in both paramagnetic and ferromagnetic phases and spin density were modelled. The results show that the most populated d orbitals of Ti atom are dxz and dyz. The orbital ordering evidenced in this material is observed at 100 and 20 K due to the orthorhombic distorsion. The wave function of the unpaired electron is a linear combination of these particularly populated t2g orbitals
Martin, Nicolas. "Etude structurale et dynamique de plusieurs systèmes magnétiques par la technique de l'écho de spin neutronique résonant." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY116/document.
Повний текст джерелаThis thesis is mainly concerned with the use of several polarized neutron scattering techniques for carrying high resolution diffraction and inelastic spectroscopy experiments. We describe exhaustively our neutron resonant spin-echo option ZETA, installed on the thermal triple-axis spectrometer CRG IN22 at Institut Laue Langevin. Through it, we study the nuclear structure and spin dynamics of several model systems. First, we are interested in the BaM2(XO4)2 (M = Co, Ni; X = As, P)-family which members are good prototypes of quasi-2D magnetic systems. The effect of magnetic ordering on lattice constants is revealed thanks to Larmor diffraction. Moreover, we show that the thermal evolution of optic magnon lifetime in BaNi2(PO4)2 is strongly affected by the presence of defects in its structure. Then, we address the spin-chain and -ladder compound Sr14Cu24O41. We first focus on the study of the inelastic peak associated with the spin gap in the ladders spectrum and introduce a method capable of showing directly the degeneracy of the associated spin transition. We also evaluate its intrinsic linewidth and observe the effect of different charge ordering process on the material crystallographic structure. Ultimately, we adapt our instrumentation to perform time-resolved reflectometry experiments on a magnetic multilayer which can possess interesting properties for spintronics applications, through the so-called MIEZE technique
Lopez, Isabelle. "« Développement d'un système universel de coulée d'alliages dentaires par centrifugation axiale à très haute vitesse sous vide secondaire »." Thesis, Reims, 2013. http://www.theses.fr/2013REIMO201.
Повний текст джерелаAlthough the manufacture of titanium dental prostheses has experienced a real rise in the last years, the production of those products remains quite expensive, and the choice of pro-ducers is still limited. The partners of the European research project Denticast® have identi-fied a high potential for the creation of an innovative machine that can produce those dental parts at low cost and high quality level. The aim of this research is the development of a new, innovative and versatile system of casting alloys, which can cast all dental alloys (NiCr, CoCr) as well as titanium and its alloys. The prototype Denticast® associates for the first time the melting by induction and the injection by centrifugation with high speed under vacuum. Totally preset, this machine should be able to evolve according to the devel-opment of new dental materials.The project combines European partners from 3 different countries (France, Germany and Italy) and three sectors: industrial, academic and dental, so that each of them contributes to the project. It presents three main phases: a study phase, a phase of design and the evalua-tion phase of the prototype.Our results show that Denticast® is able to produce quality parts for dental use with a ho-mogeneous and fine grain, with a low level of residual stress and a relatively low volume of fraction porosity. In most cases, the mechanical characteristics are equal or even greater than other systems on the market at present
Noor, Faizani M. "Advanced techniques for extracting structural information from neutron diffraction of glasses." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/82169/.
Повний текст джерелаRidley, Christopher James Taylor. "Development of high pressure and cryogenic techniques, and their application to neutron diffraction." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28890.
Повний текст джерелаPisula, Rafal. "Synchroton and neutron diffraction techniques applied to the study of ettringite and cement." Thesis, Birkbeck (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399016.
Повний текст джерелаBrowne, Peter Anthony. "Determination of residual stress in engineering components using diffraction techniques." Thesis, University of Salford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365984.
Повний текст джерелаAnanthaviravakumar, Nada. "Investigation of residual stresses in engineering components using neutron and synchrotron x-ray diffraction techniques." Thesis, University of Salford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248906.
Повний текст джерелаLarsson, Cecilia. "Determination of residual stresses and mechanical properties using neutron, X-ray diffraction, micro- and nanoindentation techniques /." Linköping : Univ, 2003. http://www.bibl.liu.se/liupubl/disp/disp2003/tek856s.pdf.
Повний текст джерелаNervo, Laura. "Characterisation of the deformation mechanisms in HCP metals by combined use of X-ray imaging and diffraction techniques." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-the-deformation-mechanisms-in-hcp-metals-by-combined-use-of-xray-imaging-and-diffraction-techniques(50fe7be6-4fbf-48e3-86de-942589bb000d).html.
Повний текст джерелаLalonde, Jean-François. "Contribution aux techniques de mesure des contraintes résiduelles des pièces brutes et usinées par diffraction aux neutrons." Mémoire, École de technologie supérieure, 2009. http://espace.etsmtl.ca/62/1/LALONDE_Jean%2DFran%C3%A7ois.pdf.
Повний текст джерелаBarnes, Paris W. "Exploring structural changes and distortions in quaternary perovskites and defect pyrochlores using powder diffraction techniques." Columbus, Ohio : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1064346592.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xxvi, 255 p.; also includes graphics. Includes abstract and vita. Advisor: Patrick M. Woodward, Dept. of Chemistry. Includes bibliographical references (p. 221-228).
Citterio-Bigot, Hélène. "Caractérisation par des techniques non destructives de la reconstruction osseuse autour d'implants de nouvelle génération Titane / nano-HydroxyApatite." Reims, 2009. http://www.theses.fr/2009REIMO202.
Повний текст джерелаSwann, Nichola Jean. "Time-resolved studies of the crystallisation and dehydration of lactose and other hydrates using synchrotron X-ray and neutron powder diffraction techniques." Thesis, Keele University, 2015. http://eprints.keele.ac.uk/4216/.
Повний текст джерелаValle, Orero Jessica. "Dynamics and thermal behaviour of films of oriented DNA fibres investigated using neutron scattering and calorimetry techniques." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2012. http://tel.archives-ouvertes.fr/tel-00734670.
Повний текст джерелаLEVY, TUBIANA RONITE. "Etude des composites a matrice metallique par la technique de la diffraction de neutrons : analyse du comportement elastoplastique et evaluation des contraintes residuelles." Paris 11, 1999. http://www.theses.fr/1999PA112292.
Повний текст джерелаDhaher, Sameh. "L'étude du stockage solide de l'hydrogène et des complexes sigma-dihydrogène." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30230.
Повний текст джерелаAdopting clean and emission- free energy cycle using hydrogen as an energy carrier could be the solution in order to curb the ill effects of energy crisis and global warming on the planet. Thus, the lack of efficient hydrogen storage devices has stimulated the search of new systems. In this manuscript, the dehydrogenation of the bis-dihydrogen ruthenium complex without additives at the ruthenium center has been reported in Chapter II. The unusual and rare dimeric complex bearing two phosphido bridges was accessed from thermolysis of the bis(dihydrogen) complex RuH2(H2)2(PCyp3)2. The complex was characterized by NMR, IR, UV-Visible, X-ray, neutron structure and DFT calculations. Surprisingly, the complex shows a reversible up take and release of H2 at room temperature in solution as well as in the solid state. This is one major criteria for designing a solid hydrogen storage material. The activation of the H-H bond has been subjected to a detailed study in Chapter III. Several novel ruthenium complexes bearing fac-coordinating ligands, 1,3,5-triaminocyclohexane (tach) and 1,4,7-triazacyclononane (tacn) and different anions have been prepared. DFT investigation has been deployed throughout these studies for a fine-level examination of H-H bond activation. An attractive goal in the context of hydrogen storage is to combine magnesium hydride, MgH2 or MOFs to organometallic complexes. This is the purpose of the fourth chapter. Doping magnesium hydride with ruthenium or nickel precursors shows promising results
Chable, Johann. "Électrolytes solides fluorés pour batteries tout solide à ions F-." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0276/document.
Повний текст джерелаThis work deals with the synthesis, shaping and characterization of RE1-xMxF3-x (RE = La, Sm, Ce et M = Ba, Ca, Sr) tysonite-type solid solutions. In a first part, onemeticulous approach has been set up for La1-xBaxF3-x solid solution, chosen as a reference.The solid-state synthesis of these materials led to a better knowledge of their chemicalcomposition (Vegard’s laws) and of the structure-ionic mobility correlations. The impact ofthe sintering process on the ionic conductivity is also highlighted. In a second part, the effectsof the nanostructuration conducted by ball-milling of the microcrystalline samples areevaluated. The use of the Design of Experiments methodology led to identify the optimummilling conditions. It appears that the synthesis of electrolytes can be sped- and scaled-up,while keeping high ionic conductivity properties. At last, this approach is applied on othertysonite-type solid solutions, to look for the best electrolyte. The Ce/Sr and Sm/Casubstitutions generate very promising ionic conductors but not really (electro)chemicallystable compounds. A compromise has been found with the choice of the La1-xSrxF3-x solidsolution as the FIB electrolyte for the electrochemical performances tests, regarding its higherchemical stability
Alipooramirabad, Houman. "Welding Integrity of HSLA Welds." Thesis, 2017. http://hdl.handle.net/2440/119194.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2017