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Showing 1 to 20 of 40 for “"Y2O3"”.
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Microestructura y propiedades mecánicas en el sistema ZrO2-Y2O3
… En este trabajo se ha estudiado el dopado con Y2O3 debido a que las partículas t en este sistema alcanzan grandes dimensiones sin transformarse en monoclínicas (HE89), lo que hace que pueda ser usado en aplicaciones estructurales que muchas veces necesitan el uso o la exposición a altas …
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Microstructural characterization of a plasma sprayed ZrO2-Y2O3-TiO2 thermal barrier coating
… TBCs and to the sparse knowledge base of the ZrOrY2O3-TiO2 coatings. Further work should be done in the characterization of the ZrO2-Y2O3-Ti42 coatings and the study of its stability under different conditions in order to determine the real potential of this material offers as an alternative to …
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Herstellung im pulverbettbasierten Laserstrahlschmelzen der Y2O3 oxiddispersionsgehärteten Nickelbasislegierung Alloy 625 und ihre Charakterisierung
Durch das Bestreben zur Leistungs- und Effizienzsteigerung großer Gasturbinen steigen auch die Anforderungen an die eingesetzten Materialien. Ein höherer Wirkungsgrad spart Brennstoff und verringert gleichzeitig den CO2-Ausstoß. Im Speziellen stellt dies gesteigerte Anforderungen an die …
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Particle Size Dependence on the Luminescence Spectra of Eu3+:Y2O3 and Eu3+:CaO
… to probe two nanocrystalline structures, Eu3+:Y2O3 and Eu3+:CaO, was investigated. The nanocrystalline structures were prepared by the laser-vaporization-gas-phase condensation of the bulk oxides. The particle size distribution and dominant particle diameters of the nanocrystals were determined …
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Relationships between optical properties and processing in Al2O3-Y2O3 thin film waveguides and amplifers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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An investigation of the synthesis and properties of nano crystalline Y2O3:Eu3+ (prepared using micelle- based precursors)
… the reactions taking place on heating Y2O3:Eu3+ phosphor precursors in the nano particle size regime. Herein combustion syntheses to prepare nanometer sized crystallites of cubic Y2O3:Eu3+ using precursors containing sacrificial long chain alkylammonium cations (the fuel) are reported. …
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Optical properties and energy transfer between C3i and C2 sites of Eu3+ ions in Y2O3 nanocrystal and bulk systems
The effect of two distinct crystallographic sites on the optical properties and energy transfer process between Eu 3+ ions in a Y 2 O 3 lattice has been a recent focus of research in our laboratory. The luminescence and site selective emission resulting from the direct excitation of the 5 D 0 …
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Phosphors and photonic crystals
… spectra of Y2WO6: RE, Y2O2S: RE, Gd2O2S: RE and Y2O3: RE have been attributed to the different site symmetries of the rare earth ions and to the different phonon energies of the lattices. Fine nanostructures present within butterfly wing scales have been faithfully replicated using a precursor …
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A feasibility evaluation of x-ray fluorescence emission tomography and x-ray luminescence tomography for real-time assessment of photodynamic therapy
… Computed Tomography (XLCT) to image LaF3 and Y2O3 nanoparticles. A 3D XFCT/CT image of a mouse phantom conjugated with a NMR tube containing bromide and Y2O3 was produced. Additionally, a cross sectional imaging in XFCT/XLCT/CT of a mouse phantom with microcapillaries filled with LaF3:Tb3+ and …
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Νέα υλικά ανόδου κελιών καυσίμου στερεού ηλεκτρολύτη (sofc) - παρασκευή, χαρακτηρισμός και έλεγχος ιδιοτήτων
… κελιού καυσίμου αποτελούμενο από Ni/8YSZ (8 mol% Y2O3 stabilized ZrO2) κεραμομεταλλικό (άνοδος) - 8YSZ (ηλεκτρολύτης) - (La,Sr)MnO3 περοβσκίτη (κάθοδος) - LaCrO3 περοβσκίτη (συνδέτης) είναι η υποβάθμιση της απόδοσής του, η οποία μεταξύ άλλων οφείλεται στην αστάθεια της μικροδομής του …
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Microstructure and Texture of Yttrium-Nickel-Borocarbide and Samarium-Cobalt Thin Films
… crystal MgO (100) substrates without and with Y2O3 buffer layer using pulsed laser deposition (PLD). In both cases YNi2B2C grows with [001] normal to the substrate. However, the in-plane texture depends on the starting condition. For samples without buffer layer, oxygen from the substrate …
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Hot corrosion behaviour of new candidates for thermal barrier coatings application in turbine simulated environments
… Ta2O5, zirconia stabilized with both Ta2O5 and Y2O3 and zirconia stabilized with CeO2 and TiO2 is investigated. For YSZ case, the reaction between NaVO3 and Y2O3 produces YVO4 and leads to the transformation of tetragonal ZrO2 to monoclinic ZrO2. Comparing to YSZ, under a temperature of 1050 °C, …
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Heat Transport across Dissimilar Materials
… alloys that are in contact with poly-crystalline Y2O3. The motivation behind this study is to determine the relative importance of energy coupling mechanisms such as electron-phonon or phonon-phonon coupling across the interface by changing the material structure (from amorphous to crystalline), …
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Avaliação mecânica e microestrutural pós forjamento da liga de níquel 718 com adição de ítrio
… promoted carbide fragmentation. The Ni19Y2 and Y2O3 phases were evidenced in the low-Y alloy, while in the high-Y alloy, Ni17Y2, Y2S3 and Y2O3 phases were observed. Concerning the influence of the Y addition on the mechanical properties, it was observed that there is an optimal yttrium value …
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Upscaling effect in the preparation of metal hydride materials
… The alumo-silica crucible was coated with a Y2O3 slurry, whereas the graphite crucible was coated with Mo slurry + (Y2O3 + Mo) + Y2O3 slurry. However, even though coated with Y2O3, the XRD revealed an impurity phase in both alloys (La2TiO5) with an additional impurity phase in the alloy …
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Příprava chemicky vázané fosfátové keramiky na bázi yttria
… vhodné syntézy fosfátového pojiva na bázi Y2O3-P2O5-H2O a charakterizaci výsledných produktů. Byly připraveny různé typy syntéz s následnou charakterizací fázového a chemického složení výsledných produktů. Vzorky byly také měřeny na elektronovém mikroskopu pro zjištění jejich povrchové …
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Electrochemical Investigation of Thin Nickel, Copper and Silver Films Interfaced with Yttria-Stabilized Zirconia
… catalysis (EPOC). Polycrystalline YSZ (8 mol % Y2O3-ZrO2) pellets were synthesized in the lab and films deposited onto them using evaporative physical vapor deposition (PVD). The critical thickness of copper, silver and nickel thin films were foundusing in-situ resistance measurements. Following …
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Friction Consolidation of Oxide Dispersion Strengthened Incoloy ® Alloy Ma956 Powder
… milling process which mixes very fine Y2O3 particles with elemental alloy powders by Mechanical Alloying (MA) in an attritor. The second (or back end) stage of the process consists of consolidating the mechanically alloyed powder by hot extrusion in vacuum-sealed cans at about 1000°C, …
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Optical and structural characterization of metal oxides and carbon nitride compounds for the development of organic/inorganic hybrid systems
… interest compounds (e.g. TiO2, Fe3O4, Fe2O3, Y2O3, ZnO). The still increasing interest for this class of materials is mainly due to the ability to take advantage of their diversity to find new important applications in several research field. Their applicability, strengthened by the low cost, …
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Studies of Used Fuel Fluorination and U Extraction Based on Molten Salt Technology for Advanced Molten Salt Fuel Fabrication
… lanthanum oxide (La2O3), and yttrium oxide (Y2O3) were fluorinated into uranium fluoride (UF4), lanthanum fluoride (LaF3), and yttrium fluoride (YF3). By sampling and recording the change in concentration over time, the reaction rate of all three oxides was determined and a temperature …
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