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Showing 1 to 20 of 110 for “"Hafnium"”.
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Infrared spectrum of hafnium
… construction and operation of microwave excited hafnium discharge tubes is described.
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Graphene supported hafnium oxide nanopores for DNA sensing
… a new solid-state nanopore sensor consisting of hafnium oxide suspended by functionalized graphene is reported along with DNA transport properties and dielectric characterization of the film in solution.
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Microstructures and oxidation properties in hafnium-tantalum-nitride ceramics
… the microstructure-property relationship in the hafnium nitride system, two sets of hafnium nitride diffusion couples were processed by hot-isostatic pressing and their resulting microstructure and phase orientation were identified. Distinct regions were found in the diffusion couples. It was …
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Processing and characterization of boron carbide-hafnium diboride ceramics
<p>"Hafnium diboride based ceramics are promising candidate materials for advanced aerospace and nuclear reactor components. The effectiveness of boron carbide and carbon as HfB₂ sintering additives was systematically evaluated. In the first stage of the research, boron carbide and carbon additives …
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Hafnium Metal-Organic Frameworks: Formation Routes and Defect Engineering
Hafnium Metal-Organic Frameworks: Formation Routes and Defect Engineering Francesca Catherine Noriko Firth Abstract Metal-organic frameworks (MOFs) consist of metal nodes or clusters linked by multidentate organic ligands. By altering the identity of these components, the properties of the MOF can …
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Ligand-Induced Cleavage Of Dinitrogen By A Hafnium Metallocene Complex
… bound dinitrogen complexes of zirconium and hafnium, [([eta]5C5Me3H2)2M]2([eta]2, [eta]2-N2) (M = Zr, Hf), have been prepared by alkali metal reduction of the corresponding diiodide precursors. UV-Visible spectroscopy and X-ray diffraction studies established a higher degree of N2 activation …
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Oxidation behavior of laser clad nickel-aluminum-chromium-hafnium alloys
Controversy regarding the mechanism(s) responsible for the retention of alumina scales formed on NiAlCr alloys containing reactive elements remains. Laser cladding is the process where a mechanical mixture of powders is rapidly melted and fused to a solid substrate using a CO$\sb2$ laser. The …
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Ferroelectric doped hafnium oxide and its application on electronic devices
… on the ferroelectric material. Recently, doped hafnium oxide (HfO2) has garnered attention with its excellent scalability, reliability, and compatibility with the current CMOS process. This thesis introduces two research projects aimed at improving the electrical properties of …
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INVESTIGATION OF THE STRUCTURAL PROPERTIES OF HAFNIUM ZIRCONIUM OXIDE THIN FILMS
Hafnium-zirconium oxide (HfxZr1-xO2)-based dielectrics have received an abundance of attention recently, holding promise for use in CMOS-compatible ferroelectric memory technology. Unlike in conventional ferroelectrics, ferroelectricity in HfxZr1-xO2 is retained in ultrathin films of only a few …
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Growth, physical properties, and nanostructuring of epitaxial metastable hafnium aluminum nitride
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-12-02T17:37:03Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Howe_Brandon.pdf: 35213703 bytes, checksum: 4339e1bf08b5bebc6922899d61292b4e (MD5)
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Process development of cobalt base superalloys modified with hafnium and zirconium
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1980.
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Hafnium Dioxide Nanoparticle Thin Film Morphology and Reactivity with Dimethyl Methylphosphonate
… reactions that occur on the surface of hafnium dioxide. Metal oxide and metal-oxide nanoparticles have been shown to decompose organophosphonate molecules. In this study, high surface area hafnium oxide nanoparticles are synthesized via laser ablation. This creates nanoparticles that are …
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Les propriétés optiques du hafnium dans l'ultraviolet à vide: thèse
"Les mesures de la réflectivité du hafnium en fonction de l'angle d'incidence ont été effectuées dans un domaine spectral s'étendant de 500 A à 1900 A pour deux états de contamination du métal. On peut voir ainsi la nécessité de faire un nettoyage de l'échantillon avant d'effectuer toute mesure. A …
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Materials properties of hafnium and zirconium silicates: Metal interdiffusion and dopant penetration studies.
Hafnium and Zirconium based gate dielectrics are considered potential candidates to replace SiO2 or SiON as the gate dielectric in CMOS processing. Furthermore, the addition of nitrogen into this pseudo-binary alloy has been shown to improve their thermal stability, electrical properties, and …
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Thermodynamic study of the hafnium-sulphur system between HfS₂ (c) and HfS₃ (c)
Includes bibliographical references (pages 98-99).
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Zirconium and hafnium organometallic compounds: Molecular geometry for five-, and seven-coordinate species
Alkylation of ZrCl$\sb4$ with phenyllithium affords the new d$\sp0$ complex $\rm\lbrack Li(Et\sb2O)\rbrack\sb2\lbrack ZrPh\sb6\rbrack ;$ the $\rm\lbrack ZrPh\sb6\sp{2-}$) anion adopts a trigonal prismatic geometry. Despite the presence of orbitals on the phenyl ligands that are of the right …
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Environmental behavior of hafnium : the impact on the disposition of weapons-grade plutonium
… to examine the environmental behavior of hafnium and its utility as a neutron poison for the disposition of weapons-grade plutonium in Yucca Mountain. The hydrolysis of hafnium was investigated by potentiometric titration in solutions of varying ionic strength to determine the stability …
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An experimental and theoretical investigation of the preferred orientation in deformed and recrystallized hafnium
… and determine the feasibility of fabrication of hafnium and secondly to study the deformation characteristics of the material in light of the overall study of hexagonal metals aimed at the development of an overall general theory of plastic deformation. This appeared to envolve a study of the …
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