Results 181 to 190 of about 92,344 (249)

Photochromism in copper-dopped niobium pentoxide

Philosophical Magazine, 1971
Abstract The photochromic properties of niobium pentoxide doped with copper have been investigated. The original material is off-white but it darkens on exposure to ultra-violet radiation. It reverts to its original colour by a thermal bleaching process which has an activation energy of 0.6 ev.
W. Clark, R. Stroud
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The preparation of tantalum‐free niobium pentoxide

Journal of Applied Chemistry, 1955
AbstractA 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, 1977
When 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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Reduction and non-stoicheiometry of niobium pentoxide

Journal of the Chemical Society, Dalton Transactions, 1972
The reduction equilibria and non-stoicheiometry of niobium pentoxide have been re-examined in order to correlate thermodynamic behaviour with structural modification during reaction. Equilibria were measured thermogravimetrically, by (T,x) scans in constant gas buffer mixtures, over oxygen activities 10–15–10–19 atm at 900–1050 °C.
K. M. Nimmo, J. S. Anderson
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ISOELECTRIC POINTS FOR NIOBIUM AND VANADIUM PENTOXIDES

Journal of Dispersion Science and Technology, 1994
ABSTRACT The isoelectric points for niobium and vanadium pentoxide were determined through electrophoretic measurements and the experimental results were compared with three alternative procedures to predict this parameter. Experimental and predicted results show good agreement for Nb2O5 that presents a well defined value for the isoelectric point but ...
Gaspar González, Sandra M. Saraiva, Washington Aliaga   +2 more
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Diameter-dependent photocatalytic performance of niobium pentoxide nanowires

Dalton Transactions, 2013
Thermal 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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Fabrication of 100 Nm-Thick Horizontal Slot Waveguides Using Niobium-Pentoxide for Sensing Devices

2025 30th OptoElectronics and Communications Conference (OECC) and 2025 International Conference on Photonics in Switching and Computing (PSC)
We analyzed and fabricated Nb2O5 horizontal waveguides with 100 nm-thick hollow slot regions. Also, about 100 nm-thick hollow slot structures in horizontal slot waveguides were obtained in fabricated devices.
Y. Hayama, Nao Suzuki, U. Endo, K. Nakatsuhara   +3 more
semanticscholar   +1 more source

Photoacoustic Spectroscopy of Titanium Dioxide, Niobium Pentoxide, Titanium:Niobium, and Ruthenium-Modified Oxides Synthesized Using Sol-Gel Methodology

Applied Spectroscopy
The aim of this work was the development and morphological/chemical, spectroscopic, and structural characterization of titanium dioxide, niobium pentoxide, and titanium:niobium (Ti:Nb) oxides, as well as materials modified with ruthenium (Ru) with the ...
D. T. Dias, A. O. Rodrigues, Pietra B. Pires, B. C. Semianko, M. E. K. Fuziki, G. G. Lenzi, S. Sabino   +6 more
semanticscholar   +1 more source

Preparation and dielectric properties of niobium pentoxide crystals

Journal of Physics and Chemistry of Solids, 1968
Abstract Careful control of the halogen transport of Nb2O5 has permitted the growth of single crystals large enough for dielectric studies. Measurements of the B, H, M, P and T modifications have been made over the frequency range 20–100 MHz and from 77 to 500°K. For the B, H and P modifications, where the structure is known, a discussion is given of
F.P. Emmenegger, M.L.A. Robinson
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Electrophysical properties of hot-pressed niobium pentoxide

Soviet Powder Metallurgy and Metal Ceramics, 1973
1. 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'
openaire   +1 more source