Academic literature on the topic 'Nitrure de bore hexagonelle'
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Journal articles on the topic "Nitrure de bore hexagonelle":
Yallese, Mohamed Athmane, Lakhdar Boulanouar, and Kamel Chaoui. "Usinage de l'acier 100Cr6 trempé par un outil en nitrure de bore cubique." Mécanique & Industries 5, no. 4 (July 2004): 355–68. http://dx.doi.org/10.1051/meca:2004036.
Greco, M., C. Guimon, M. Loudet, and G. Pfister-Guillouzo. "Étude par XPS et calculs ab initio de couches minces de nitrure de bore." Journal de Chimie Physique 91 (1994): 1711–27. http://dx.doi.org/10.1051/jcp/199491711.
Matar, S., V. Gonnet, and G. Dernazeau. "Structure électronique du nitrure de bore cubique dans l'approximation de la densité électronique locale." Journal de Physique I 4, no. 2 (February 1994): 335–42. http://dx.doi.org/10.1051/jp1:1994141.
Djouadi, A., D. Bouchier, and M. Lambertin. "Effets thermiques et collisionnels sur les contraintes internes de films de nitrure de bore déposés sous assistance ionique." Revue de Métallurgie 91, no. 9 (September 1994): 1283. http://dx.doi.org/10.1051/metal/199491091283.
Angleraud, B., J. Aubreton, and A. Catherinot. "Étude de l'expansion du panache plasma formé lors de l'interaction entre un laser ultraviolet et une cible de nitrure de bore ; application à la réalisation de couches minces." Annales de Physique 22 (February 1997): C1–121—C1–122. http://dx.doi.org/10.1051/anphys/1997022.
Dissertations / Theses on the topic "Nitrure de bore hexagonelle":
Susana, Laura. "Advances in Nanocharacterization Techniques : 4D-STEM and XEOL Studies on Perfect and Defective h-BN." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP016.
Probing physical properties such as charge density and optical response, on a nanometric scale is an experimental challenge which motivates a continuous search for innovative instrumental techniques and methodologies. This thesis aligns within this context, presenting advances in characterization techniques utilizing transmission electron microscopy and X-ray synchrotron sources. Benchmarks of the technical and methodological developments performed have been obtained on hexagonal boron nitride (h-BN), a wide bandgap material characterized by a significant charge transfer, a complex defective landscape and original optical properties. The first part of this work focuses on improvements in four-dimensional scanning transmission electron microscopy (4D-STEM) which has recently emerged as a powerful tool for simultaneously obtaining precise structural determinations and capturing details of local electric fields and charge densities. Accurately extracting quantitative data at the atomic scale poses challenges, primarily due to probe propagation and size-related effects which, when neglected, may even lead to misinterpretations of qualitative effects. This work establishes the accuracy of the technique for the measurement of electric fields and charge densities in thin materials via a comprehensive study on pristine and defective h-BN flakes. Through a combination of experiments and numerical simulations, it is demonstrated that while precise charge quantification at individual atomic sites is hindered by probe effects, 4D-STEM can directly measure charge transfer phenomena at an h-BN monolayer edge with sensitivity down to a few tenths of electron and a spatial resolution on the order of a few angstroms. The second part of this thesis discusses the implementation of a novel X-Ray Optical Excited Luminescence (XEOL) setup at the Resonant Inelastic X-ray Scattering (RIXS) branch of the soft X-Ray SEXTANTS beamline of the Synchrotron SOLEIL. The combination of RIXS and XEOL opens new possibilities for correlated studies of excitation and recombination phenomena in the visible-far UV energy range. The synchronization of the XEOL spectrometer acquisition camera with the beamline X-Ray monochromator permits to acquire full luminescent spectra while scanning the incident radiation energy across the core absorption edge of a given element. From the 2D maps of excitation energy versus luminescence thus obtained, it is possible to associate specific near edge absorption fine structures to well defined luminescence features. Benchmarks have been obtained on perfect and doped cubic and hexagonal boron nitride with results acquired in the far UV comparable with state-of-art optical techniques. The analysis of near edge fine structures of h-BN has permitted to associate low energy emissions to the presence of B-O bonds. Finally the application of XEOL to the study of an h-BN/WS₂ monolayer vertical heterostructure luminescence has provided insights on the excitation transfer mechanism between the layers
Jaffrennou, Périne. "Etude des propriétés optiques du nitrure de bore hexagonal et des nanotubes de nitrure de bore." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2008. http://tel.archives-ouvertes.fr/tel-00344654.
L'objectif de cette étude est d'analyser les propriétés optiques de ces matériaux et, plus particulièrement, leurs effets excitoniques, en développant des méthodes de caractérisation optique adaptées pour observer des émissions UV.
Les techniques expérimentales de photoluminescence et de cathodoluminescence développées au cours de cette thèse ont tout d'abord permis de comprendre les propriétés de luminescence du hBN. Ainsi, nous avons pu confirmer la présence d'excitons libres émettant à 5.77 eV. Ensuite, en corrélant ces mesures optiques avec des analyses structurales en microscopie électronique en transmission de cristaux individuels, nous avons mis en évidence l'existence d'excitons liés à des défauts structuraux bien déterminés et émettant autour de 5.5 eV. Une fois les propriétés de luminescence du matériau massif connues, nous avons analysé de la même manière différents types de nanotubes de BN multifeuillets. Ces mesures ont pour la première fois montré que ces nano-objets émettent également dans l'UV. En se basant sur notre étude de la luminescence de hBN, nous proposons une interprétation pour l'origine de leurs émissions lumineuses UV.
Jaffrennou, Périne. "Étude des propriétés optiques du nitrure de bore hexagonal et des nanotubes de nitrure de bore." Cachan, Ecole normale supérieure, 2008. http://tel.archives-ouvertes.fr/tel-00344654/fr/.
Since several years, optical properties of semiconductors, and especially of UV emitting materials, have been extensively studied because of their potential use in optoelectronics. In that purpose, studying optical properties of hexagonal boron nitride (hBN) and boron nitride nanotubes is of particular interest since they are both wide band gap semiconductors (~6 eV). The purpose of this work is to analyze the optical properties of these materials and, more precisely, their excitonic effects by developing optical characterization methods dedicated to observe UV emissions. The experimental techniques we have developed (photoluminescence and cathodoluminescence) have allowed us understanding luminescence properties of hBN. Thus, we have observed free excitonic emissions at 5. 77 eV. Then, a correlation of these optical measurements with structural analyses of individual hBN crystallites in transmission electron microscopy has pointed out the existence of excitons bound to well identified structural defects and emitting around 5. 5 eV. After the analysis of hBN optical properties, we have performed the same type of experiments on multiwall BN nanotubes. For the first time, such measurements have shown that these nano objects also emit in the UV range. Based on our previous study of hBN luminescence properties, we interpretate the origin of the BN nanotubes UV light emissions
Gleize, Philippe. "Elaboration de nitrure de bore filamentaire." Grenoble INPG, 1991. http://www.theses.fr/1991INPG0115.
Pujol, Patrick. "Mésophases massives de nitrure de bore hexagonal." Bordeaux 1, 2000. http://www.theses.fr/2000BOR12222.
Abreal, Alain. "Proprietes refractaires des composites ceramiques alumine-nitrure de bore." Paris, ENMP, 1994. https://hal-emse.ccsd.cnrs.fr/tel-01163637.
Grenier, Isabelle. "Contribution à l'étude de l'application des dépôts ioniques à la réalisation de revêtements de nitrure de bore." Limoges, 1994. http://www.theses.fr/1994LIMO0003.
Remadna, Mehdi. "Le Comportement du système usinant en tournage dur." Lyon, INSA, 2001. http://theses.insa-lyon.fr/publication/2001ISAL0022/these.pdf.
The evolution of materials performances for cutting tools and their improvements allowed the experiment to operate with High Speed Machining (HSM). The diversity of parameters which determine the level of removal rate of the chip allows the constitution of several modalities in machining with the HSM system, therefore the important factors as efforts, vibrations, roughness, choice of tools, power… become constraints. In this context we had developed some researches in order to specify the behaviour of the cutting tool in Cubic Boron Nitride (CBN). . We had observed experimentally the profile of the wear at various cutting speeds. The profiles analysis process brings a contribution for good industrial mastery on turning tools wear. As summery, our study, which is essentially experimental, shows at first, that the geometry of the cutting evolves strongly in the life time of the tool. The CBN inserts, this lifetime increases as the chip section decreases, even though observations and measures have shown for each case an evolution in the geometry of cutting. With an increasing, at the same time, of specific efforts components of the cutting. These results show that the hard steel machining with CBN tools gives a good geometrical quality on the surface of tools machines, which one conceived with classic technologies on spindles with rolling bearing. On the other hand, the stress and metallurgical state of the manufactured surface make difficult their control because they are linked to a cut geometry which evolves strongly during the lifetime of the insert. This study shows, also, that the specific effort of cut changes strongly the direction in time and correlatively with the tool wear. It is really important to considerate this evolution to conceive a new tool machine and exploitable ranges of manufacturing in an industrial environment
Remadna, Mehdi Rigal Jean-François. "Le Comportement du système usinant en tournage dur application au cas d'un acier trempé usiné avec des plaquettes CBN (Nitrure de Bore Cubique) /." Villeurbanne : Doc'INSA, 2003. http://csidoc.insa-lyon.fr/these/2001/remadna/index.html.
Dibandjo, Nounga Philippe. "Synthèse et caractérisation de Nitrure de Bore à mésoporosité organisée." Lyon 1, 2005. http://www.theses.fr/2005LYO10212.
Book chapters on the topic "Nitrure de bore hexagonelle":
DOUMENG, Marie, Karl DELBÉ, Florentin BERTHET, Olivier MARSAN, Jean DENAPE, and France CHABERT. "Effets de taille et de nature des charges sur les propriétés thermiques et mécaniques des composites à matrice PEEK." In Nanocomposites, 97–146. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9031.ch4.