Results 201 to 210 of about 3,969 (258)
Zero Indirect Band Gap and Flat Bands in a Niobium Oxyiodide Cluster Material. [PDF]
J Am Chem SocBeitlberger J +6 more
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Sustainable and Energy-Efficient Hydrogen Generation from NaBH<sub>4</sub> Methanolysis Enabled by Nb<sub>2</sub>O<sub>5</sub> Synthesized through a Pressureless Microwave Hydrothermal Method. [PDF]
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The oxidation of niobium and the structure of niobium oxides
Soviet Physics Journal, 1966Results are given for the oxidation kinetics of niobium in air at 500–1000 °C, together with x-ray data on the oxides; α-Nb2O5 (orthorhombic) is formed up to 850 °C, and above this β-Nb2O5, also orthorhombic but with lattice constants nearly twice as large. The physics of the oxidation is discussed.
M. P. Arbuzov, V. G. Chuprina
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The oxidation of niobium-titanium and niobium-molybdenum alloys
Journal of the Less Common Metals, 1960Abstract The oxidation rates of several niobium-titanium and niobium-molybdenum alloys have been measured over a considerable range of temperature and the results may be understood in terms of the chemical and physical properties of the scales.
B.B. Argent, B. Phelps
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Zeitschrift für anorganische und allgemeine Chemie, 1980
AbstractThe solid‐state reaction between TeO2 and Nb2O5 was studied by means of X‐ray powder diffraction, at room temperature, using samples prepared in the interval of 500°C to 850°C. Several whitish coloured stable mixed oxide phases have been found, corresponding to the formulas TeO2 · 3Nb2O5, 3TeO2 · Nb2O5 and 4TeO2 · Nb2O5.
J. C. J. Bart, G. Petrini
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AbstractThe solid‐state reaction between TeO2 and Nb2O5 was studied by means of X‐ray powder diffraction, at room temperature, using samples prepared in the interval of 500°C to 850°C. Several whitish coloured stable mixed oxide phases have been found, corresponding to the formulas TeO2 · 3Nb2O5, 3TeO2 · Nb2O5 and 4TeO2 · Nb2O5.
J. C. J. Bart, G. Petrini
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Catalytic Oxidation of Niobium
Physical Review Letters, 1984Etude de l'oxydation de films de niobium revetus de couches monomoleculaires de cerium, par spectrometrie de photoelectrons RX. Il se forme des quantites significatives de Nb 2 O 5 a des pressions aussi faibles que 6,6•10 −6 Pa, favorisees par la couche de ceAnalyse quantitative cSilicium|ANAst GravimetriehanAlliage2 A:>50 Si:10-15rium (trivalent en ...
E. -E. Latta, Maria Ronay
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Versatile resistive switching in niobium oxide
2016 IEEE International Symposium on Circuits and Systems (ISCAS), 2016Resistive switching devices have a high potential for nonvolatile memories and circuit applications. This paper gives a review of the different switching modes in niobium oxide. Abrupt memory switching, threshold switching with or without memory switching and analog switching can be obtained by controlling the stoichiometry of the layer stack either ...
T. Mikolajick +4 more
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Studies on Niobium Oxides and Polymorphism of Niobium Pentoxide
Transactions of the Indian Ceramic Society, 1969The oxidation of pure niobium powder in air has been investigated. It is observed that after the initial dissolution of a small percentage of oxygen in the niobium lattice, oxidation commences with the formation of lower-oxides of niobium. The existence of a sub-oxide ascribed as NbOx is detected below 350°C having a structure closely resembling that ...
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Synthesis of Niobium Carbide from Niobium Oxide Aerogels
Chemistry of Materials, 1995Niobium carbide (NbC) synthesis was studied by the temperature-programmed reaction (TPR) between niobium oxide precursors of different textural properties and a 20% (v/v) CH{sub 4}-H{sub 2} mixture. Surface areas ranging between 13 and 74 m{sup 2}/g were obtained depending on the temperature and on the nature of the precursor (Nb{sub 2}O{sub 5} or an ...
V. L. S. Teixeira da Silva +3 more
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Delayed Ionization of Photoexcited Niobium and Niobium Oxide Clusters
Berichte der Bunsengesellschaft für physikalische Chemie, 1992AbstractThe delayed emission of electrons from hot refractory metal clusters can be regarded as the molecular equivalent of “thermionic emission”, which is well‐known for metal surfaces. Niobium clusters – generated via pulsed laser vaporization technique – were exposed to a 10 ns laser pulse, and the delayed emission of electrons from the clusters was
K. Athanassenas +3 more
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