Results 181 to 190 of about 3,293 (219)
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The preparation of tantalum‐free niobium pentoxide
Journal of Applied Chemistry, 1955AbstractA method is described whereby the tantalum content of ‘Specpure’ niobium pentoxide can be reduced to a few parts per million without simultaneous contamination of the sample.
M. J. Cabell, I. Milner
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Reduction of niobium pentoxide in a hydrogen discharge
Journal of Vacuum Science and Technology, 1977When exposed to ’’active hydrogen’’ from a microwave discharge, white α-niobium pentoxide becomes gray-black. This reduction product has been examined by several techniques, including Auger electron spectroscopy. It is found that the material within a few tenths of a micrometer from the surface is reduced to niobium dioxide, and that the remaining ...
M.R. Wertheimer, J.-P. Bailon
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Diameter-dependent photocatalytic performance of niobium pentoxide nanowires
Dalton Transactions, 2013Thermal reactions of a niobium oxo-oxalate complex, (NH4)3[NbO(Ox)3]·H2O, with ternary amines having more than two methylene chain units as structure directing solvents led to self-assemblies suitable for one dimensional growth to afford amorphous niobium oxide nanowires whose diameters depended on methylene chain lengths in the amines. These nanowires
Kenji, Saito, Akihiko, Kudo
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The electrical properties of bistable niobium pentoxide films
Journal of Non-Crystalline Solids, 1972Abstract Current, voltage, temperature ( I - V - T ) and conductance, voltage, temperature ( G - V - T ) as well as switching time measurements have been made on the switching states of bistable amorphous niobium pentoxide films. The measurements are indicative of a charge transfer mechanism occurring prior to switching.
D.J Herrell, K.C Park
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Electrophysical properties of hot-pressed niobium pentoxide
Soviet Powder Metallurgy and Metal Ceramics, 19731. Niobium pentoxide in the solid state is an electronic semiconductor, whose energy of activation of current carriers, δE, in the region of its melting point is equal to 1.56 eV. 2. At room temperature, Nb2O5 exhibits thermal ionic polarization, which grows up to a certain temperature and is characterized by the formation of a unipolar ...
I. G. Tkachenko, E. K. Fen'
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Synthesis of single-crystal niobium pentoxide nanobelts
Acta Materialia, 2008Abstract In this study, we first developed a simple synthetic route to prepare layered structure NH4Nb3O8 nanobelts, and then converted NH4Nb3O8 phase to single-crystal Nb2O5 by thermal treatment in air. The lengths of the nanobelts range from several hundreds of nanometers to several tens of micrometers, and the thickness and width of nanobelts are ∼
Mingdeng Wei +3 more
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The reduction of niobium and tantalum pentoxides by silicon in vacuum
Journal of Alloys and Compounds, 2001Abstract The use of silicon as a reducing agent for Nb 2 O 5 and Ta 2 O 5 to obtain the metals under pyrovacuum conditions has been investigated. Reduction occurs due to the removal of oxygen by evaporation of volatile silicon monoxide, SiO (v) .
Alok Awasthi +4 more
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The electrical properties of niobium pentoxide scales during their formation on niobium
Oxidation of Metals, 1973A study of the electrical properties of compact scales growing on niobium has revealed several new properties of the oxidation reaction. The growth of the oxide follows two parabolic rates, with the latter approximately four times the former. Both the rate constants and the time of transition between the rates are sensitive to oxygen pressure, but it ...
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The Formation of a Zinc Oxide-Niobium Pentoxide Spinel
Journal of The Electrochemical Society, 1963The spinel was synthesized. The reactions occurring between and were investigated as a function of temperature and composition. Evidence is presented to demonstrate the important role vapor played in formation of the spinel. It would appear that in the system spinel formation was the last stage in a sequence of reactions in which the lowest symmetry ...
Robert W. Harrison, Eugene J. Delgrosso
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Kinetics of chlorination of niobium pentoxide by carbon tetrachloride
Metallurgical and Materials Transactions B, 1997Kinetics of the chlorination of Nb2O5 powder by CCl4 vapor in mixture with N2 in a static bed in the temperature range of 698 to 853 K were carried out at different partial pressures of CCl4 (p CCl 4), varying from 0.10 to 0.75 atm. The fraction of Nb2O5 chlorinated R at p CCl 4 of 0.6 atm
P. K. Jena, E. A. Brocchi, R. I. Garcia
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