Results 231 to 240 of about 249,243 (285)

The application of niobium and tantalum oxides for implant surface passivation [PDF]

Journal of Biological Physics and Chemistry, 2007
Despite the advantages of ceramics, with their high corrosion stability in vivo, most medical implant constructions are still made from metals [1]. To increase the corrosion stability of metals, different coatings are applied to the implant surfaces,
Jeremy J Ramsden
exaly   +9 more sources

EELS of Niobium and Stoichiometric Niobium-Oxide Phases—Part II: Quantification [PDF]

Microscopy and Microanalysis, 2009
AbstractA comprehensive electron energy-loss spectroscopy (EELS) study of niobium (Nb) and stable Nb-oxide phases (NbO, NbO2, Nb2O5) was carried out. Part II of this work is devoted to quantitative EELS by means of experimental k-factors derived from the intensity ratio of the O-K edge and the Nb-M4,5 or Nb-M2,3 edges for all three stable Nb-oxides ...
David, Bach, Reinhard, Schneider, Dagmar, Gerthsen   +2 more
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Electronic structure of niobium oxides

Journal of Alloys and Compounds, 2002
Abstract The results of X-ray fluorescence measurements of niobium metal and its oxides (NbO, NbO 2 and Nb 2 O 5 ) are presented. Non-resonant Nb M 4,5 and O Kα X-ray emission spectra (XES) have been measured at the Advanced Light Source (ALS, Berkeley).
Alexander Moewes, D L Ederer, M A Korotin   +2 more
exaly   +2 more sources

The oxidation of niobium and the structure of niobium oxides

Soviet Physics Journal, 1966
Results 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
openaire   +1 more source

The oxidation of niobium-titanium and niobium-molybdenum alloys

Journal of the Less Common Metals, 1960
Abstract 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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Tellurium‐Niobium Oxides

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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Catalytic Oxidation of Niobium

Physical Review Letters, 1984
Etude 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), 2016
Resistive 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, H. Wylezich, H. Maehne, S. Slesazeck, T. Mikolajick   +4 more
openaire   +2 more sources

Studies on Niobium Oxides and Polymorphism of Niobium Pentoxide

Transactions of the Indian Ceramic Society, 1969
The 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 ...
openaire   +1 more source