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Journal articles on the topic 'Niobium(V) oxide'

Author: Grafiati

Published: 3 June 2025

Last updated: 19 July 2025

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1

Störmer, H., E. Ivers-Tiffée, C. Schnitter, and D. Gerthsen. "Microstructure and dielectric properties of nanoscale oxide layers on sintered capacitor-grade niobium and V-doped niobium powder compacts." International Journal of Materials Research 97, no. 6 (2006): 794–801. http://dx.doi.org/10.1515/ijmr-2006-0128.

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Abstract Electrolytic anodization was used to form amorphous niobium oxide layers on niobium and V-doped niobium powder compacts which act as dielectric layers, e. g. in niobium-based solid electrolyte capacitors. The microstructure development within the layered structure niobium-niobium oxide was studied by scanning- and transmission electron microscopy in order to investigate the influence of processing parameters. It could be shown that the thickness as well as the quality of the oxide layers on niobium vary in a considerable range, depending on processing parameters. Examination of the in

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2

Zhang, Bo, Shuiqing Yu, Yudong Liang, and Maofa Jiang. "Electrochemical Behavior of Niobium Oxide and Titanium Oxide in NaF–Na3AlF6 Molten Salt." Metals 14, no. 3 (2024): 297. http://dx.doi.org/10.3390/met14030297.

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The Bayan Obo ore deposit is a world-renowned polymetallic coexistence mine that integrates important elements, such as rare earths, iron, niobium, and titanium. The chemical properties of niobium and titanium are similar, and the two often coexist in the Bayan Obo deposit as isomorphs, making them difficult to separate. Therefore, the separation of niobium and titanium is crucial for the efficient utilization of niobium resources in the Bayan Obo ore deposit of China. To discuss the feasibility of separating niobium and titanium by selective electrolysis, cyclic voltammetry and square wave vo

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3

Golubeva, N. K., D. P. Danilovich, D. D. Nesmelov, and I. D. Shabalkin. "PREPARATION OF NIOBIUM (V) OXIDE WITH CONTROLLED DISPERSITY AND MORPHOLOGY." Steklo i Keramika, no. 1 (January 2022): 31–38. http://dx.doi.org/10.14489/glc.2022.01.pp.031-038.

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In this work, the effect of the annealing temperature and the chemical history of the precipitate on the morphology and phase composition of the Nb2O5 powder was studied. Nb2O5nH2O precipitate and gel-like niobium citrate were obtained by solution methods. The synthesis of niobium oxide was carried out at temperatures of 600, 1000, and 1200 °C, the synthesis products were analyzed using X-ray diffraction, scanning electron microscopy, X-ray microscopy, and differential thermal and thermogravimetric analysis. Annealing of niobium citrate at a temperature of 600 °C makes it possible to obtain ni

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4

Vukićević, Nataša M., Vesna S. Cvetković, Ljiljana S. Jovanović, Olga S. Radulović, and Jovan N. Jovićević. "Electrodeposition of Nb and Al from chloroaluminate melt on vitreous carbon." Metallurgical and Materials Engineering 22, no. 2 (2016): 91–100. http://dx.doi.org/10.30544/217.

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Niobium and aluminium were electrodeposited at 200 °C under argon atmosphere onto vitreous carbon from inorganic chloroaluminate melts (AlCl3+NaCl) with added niobium. Niobium was introduced into the electrolyte by anodic dissolution of metallic niobium or by chemical dissolution of Nb2O5 in a melt of equimolar AlCl3+NaCl mixture. The processes of deposition/dissolution onto/from vitreous carbon were investigated by cyclic voltammetry and chronoamperometry. Characterization of the obtained deposits was done by Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). The onl

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5

Canepa, Paolo, Giuseppe Firpo, Elena Gatta, et al. "A Two-Step Approach to Tune the Micro and Nanoscale Morphology of Porous Niobium Oxide to Promote Osteointegration." Materials 15, no. 2 (2022): 473. http://dx.doi.org/10.3390/ma15020473.

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We present a two-step surface modification process to tailor the micro and nano morphology of niobium oxide layers. Niobium was firstly anodized in spark regime in a Ca- and P-containing solution and subsequently treated by acid etching. The effects of anodizing time and applied potential on the surface morphology is investigated with SEM and AFM, complemented by XPS compositional analysis. Anodizing with a limiting potential of 250 V results in the fast growth of oxide layers with a homogeneous distribution of micro-sized pores. Cracks are, however, observed on 250 V grown layers. Limiting th

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6

Feliczak-Guzik, Agnieszka, Agata Wawrzyńczak, and Izabela Nowak. "Photocatalysis by Mixed Oxides Containing Niobium, Vanadium, Silica, or Tin." Catalysts 15, no. 2 (2025): 118. https://doi.org/10.3390/catal15020118.

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Nb-Sn, V-Sn mixed-metal oxides and Nb-Si, V-Si metal oxide–silicas were successfully synthesized through a “soft” templating method, in which appropriate amounts of metal salts (either niobium(V) chloride, or vanadium(IV) oxide sulfate hydrate or tin(II) chloride dihydrate) or tetraethyl orthosilicate (TEOS) were mixed with hexadecyltrimethylammonium chloride (HDTA) or sodium dodecyl sulfate (SDS) solutions to obtain a new series of mesoporous oxides, followed by calcination at different temperatures. As-obtained samples were characterized by SEM, TEM, XRD, and UV-Vis spectra techniques. The p

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7

Ficarro, Scott B., Jignesh R. Parikh, Nathaniel C. Blank, and Jarrod A. Marto. "Niobium(V) Oxide (Nb2O5): Application to Phosphoproteomics." Analytical Chemistry 80, no. 12 (2008): 4606–13. http://dx.doi.org/10.1021/ac800564h.

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8

Ryshchenko, Igor, Larisa Lyashok, Alexey Vasilchenko, Artem Ruban, and Leonid Skatkov. "Electrochemical Synthesis of Crystalline Niobium Oxide." Materials Science Forum 1038 (July 13, 2021): 51–60. http://dx.doi.org/10.4028/www.scientific.net/msf.1038.51.

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Features of creation of porous nanostructured oxides of transition materials on an example of niobium are considered. It has been experimentally shown that variation in anodizing modes makes it possible to obtain non-porous and porous amorphous anodic oxide films (AOF) and films of the crystalline type. It is determined that the process of AOF formation on niobium, as well as its structure and properties depend on such parameters as the type of electrolyte, anodizing voltage, activator concentration, the duration of the process. It is confirmed that the presence of an activator in the electrol

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9

Wang, Fan, Zheng Zhang, Guizhi Xiao, and Dening Zou. "Effects of Vanadium and Niobium on the Mechanical Properties and High-Temperature Oxidation Behavior of Austenitic Stainless Steels." Metals 15, no. 4 (2025): 347. https://doi.org/10.3390/met15040347.

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This study focuses on the effects of vanadium and niobium microalloying elements on the mechanical properties and high-temperature oxidation behavior of austenitic stainless steels. Vanadium–niobium elements were confirmed to play an effective role in fine-grain strengthening at room temperature, achieving a tensile strength and yield strength of approximately 768.8 MPa and 464.6 MPa, respectively, with the additions of 0.32 wt% V and 0.21 wt% Nb. During the high-temperature oxidation process, the weight gain and cracking of the oxide layer increased with increasing niobium–vanadium content. T

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10

Горох, Г. Г., А. Н. Плиговка та А. А. Лозовенко. "Столбиковые ниобиевые оксидные наноструктуры: механизм образования, микроструктура и электрофизические свойства". Журнал технической физики 89, № 11 (2019): 1747. http://dx.doi.org/10.21883/jtf.2019.11.48339.146-19.

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The morphology and microstructure of the columnar niobium oxide nanostructures were investigated. The dependences of their morphological sizes on the anodization voltages (100–450 V) and anodic alumina pore diameters (40–150 nm) were established. The features of ion transfer in the process of niobium local anodizing were investigated and the transport numbers of electrolyte anions and niobium cations were calculated. The formation and growth mechanism was proposed and discussed. The phase composition and electrophysical properties of the column nanostructures were investigated.

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11

Arsova, Irena, Abdurauf Prusi, Toma Grcev, and Ljubomir Arsov. "Electrochemical characterization of the passive films formed on niobium surfaces in H2SO4 solutions." Journal of the Serbian Chemical Society 71, no. 2 (2006): 177–87. http://dx.doi.org/10.2298/jsc0602177a.

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The electrochemical formation and characteristics of passive films on niobium surfaces in aqueous H2SO4 solutions were studied using open circuit potential and cyclic voltammetry. In the potential region between -1.0 and 1.2 V(NHE), the cyclic voltammetry data showed that the active/passive transition involves slow metal dissolution followed by the formation of semiconducting passive oxide films. The possible electrochemical reactions and the change of the oxidation steps of some niobium oxides occurring in the passive film during the polarization are proposed. A strong influence of the natura

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12

Serafím, Maria J. S., Karl E. Bessler, Sebastião S. Lemos, Maria J. A. Sales, and Javier Ellena. "The preparation of new oxoniobium(V) complexes from hydrated Niobium(V) Oxide: the crystal and molecular structure of Oxotris(2-pyridinolato-N-oxide)niobium(V)." Transition Metal Chemistry 32, no. 1 (2007): 112–16. http://dx.doi.org/10.1007/s11243-006-0142-x.

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13

Jha, Gaurav, Thien Tran, Shaopeng Qiao, et al. "Electrophoretic Deposition of Mesoporous Niobium(V)Oxide Nanoscopic Films." Chemistry of Materials 30, no. 18 (2018): 6549–58. http://dx.doi.org/10.1021/acs.chemmater.8b03254.

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14

Pilarek, Bożena, Aleksandra J. Pelczarska, and Irena Szczygieł. "Characterization of niobium(v) oxide received from different sources." Journal of Thermal Analysis and Calorimetry 130, no. 1 (2017): 77–83. http://dx.doi.org/10.1007/s10973-017-6300-x.

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15

Oliveira, Henrique S., Luiz Carlos A. Oliveira, Poliane Chagas, et al. "A bifunctional catalyst based on Nb and V oxides over alumina: oxidative cleavage of crude glycerol to green formic acid." New Journal of Chemistry 44, no. 20 (2020): 8538–44. http://dx.doi.org/10.1039/d0nj00384k.

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16

Olszta, Matthew J., and Elizabeth C. Dickey. "Interface Stoichiometry and Structure in Anodic Niobium Pentoxide." Microscopy and Microanalysis 14, no. 5 (2008): 451–58. http://dx.doi.org/10.1017/s1431927608080756.

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AbstractHigh-resolution transmission electron microscopy and electron energy loss spectroscopy (EELS) were performed on electrochemically anodized niobium and niobium oxide. Sintered anodes of Nb and NbO powders were anodized in 0.1 wt% H3PO4 at 10, 20, and 65 V to form surface Nb2O5 layers with an average anodization constant of 3.6 ± 0.2 nm/V. The anode/dielectric interfaces were continuous and the dielectric layers were amorphous except for occurrences of plate-like, orthorhombic pentoxide crystallites in both anodes formed at 65 V. Using EELS stoichiometry quantification and relative chemi

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17

Shafeeq, Suhair R., Mohammed Jalal Abdul Razzaq, Evan T. Salim, and Mohammed H. A. Wahid. "Significance of Niobium (V) Oxide for Practical Applications: A Review." Key Engineering Materials 911 (February 24, 2022): 89–95. http://dx.doi.org/10.4028/p-oylf5b.

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Nb2O5 has recently been considered as one of the oxides thin films that attracts a noticeable attraction by scientific prospective aspects. Its usefulness in a wide practical applications range such as in optoelectronic devices, optical coatings, catalysis, gas sensors, photocell, electrochromics, photoelectrodes, Ec devices, microelectronics and in the medical field paid researchers attention to synthesize it by various methods like sol.gel, electrodeposition, chemical vapor deposition etc. Among those, Pulsed laser deposition technique has achieved an effective improvements. In this paper, w

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18

Islam, Karimul, Rezwana Sultana, and Supratic Chakraborty. "Characterization and electrical response of reactively sputtered thin film deposited at oxygen and nitrous oxide environment." International Journal of Innovative Research in Physics 3, no. 2 (2022): 28–34. http://dx.doi.org/10.15864/ijiip.3204.

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Niobium oxynitride (NbON) thin films were deposited on silicon substrate using DC reactive magnetron sputtering technique of niobium metal targets at different nitrous oxide (N2O) and oxygen flow in the plasma during deposition. To get NbON thin films, the deposition parameters were also optimized. X-ray reflectivity (XRR) technique was used to estimate the film thickness of the as deposited films. The films' surface morphology and chemical compositions were investigated by field-emission scanning electron microscopy (FE-SEM) and x-ray photoelectron spectroscopy (XPS) techniques. SEM images in

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19

Iizumi, Kiyokata, Yutaka Sawada, Shigeru Okada, Toetsu Shishido, Kunio Kudou, and Kazuo Nakajima. "Preparation of Niobium Borides by Solid-state Reaction Between Niobium (V) Oxide and Amorphous Boron Powders." Journal of the Japan Society of Powder and Powder Metallurgy 54, no. 10 (2007): 682–85. http://dx.doi.org/10.2497/jjspm.54.682.

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20

Yugay, O. K., T. P. Mikhailovskaya, and K. A. Kadirbekov. "VAPOR-PHASE OXIDATION OF 2-METHYLPYRIDINEON V-Zr-O-CATALYSTS MODIFIED WITH TIN AND NIOBIUM OXIDES." Chemical Journal of Kazakhstan 79, no. 3 (2022): 101–9. http://dx.doi.org/10.51580/2022-3/2710-1185.83.

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Vapor-phase catalytic oxidation of pyridine alkyl derivatives is an effective method for obtaining a variety of physiologically active substances that are widely used in practice, as well as for the synthesis of solvents, starting materials for the production of dyes, herbicides, etc. For the process, a cheap oxidizing agent is used -atmospheric oxygen. Of great importance is the choice and creation of an active and selective process catalyst. Basically, the oxidation processes are carried out in the presence of catalysts based on vanadium oxide with the addition of transition metal oxides. Th

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21

Alias, Nurhaswani, Siti Azlina Rosli, Zuhailawati Hussain, et al. "Effect of Anodization Parameter on the Formation of Anodic Nb₂O₅ in Fluorinated Glycerol." Journal of Physics: Conference Series 2907, no. 1 (2024): 012005. https://doi.org/10.1088/1742-6596/2907/1/012005.

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Abstract Niobium (Nb) anodization in buffered electrolyte has certain disadvantages because the oxide that was formed had a low thickness. Therefore, Niobium pentoxide (Nb2O5) was prepared by anodization of Nb in a fluorinated glycerol added to it 15 ml H2O. To investigate the impact of these parameters on the morphology of film production, variations were made to the NH4F concentration, applied voltage, and electrolyte temperature bath. Since a compact oxide was developed in the absence of NHF4, fluoride is necessary to create the oxide structure of nanopores. The surface morphology of the Nb

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22

Torres, Jocilene D., Elaine A. Faria, Jurandir R. SouzaDe, and Alexandre G. S. Prado. "Preparation of photoactive chitosan–niobium (V) oxide composites for dye degradation." Journal of Photochemistry and Photobiology A: Chemistry 182, no. 2 (2006): 202–6. http://dx.doi.org/10.1016/j.jphotochem.2006.02.027.

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23

CARDINAL, T., E. FARGIN, G. LE FLEM, et al. "ChemInform Abstract: Nonlinear Optical Properties of Some Niobium(V) Oxide Glasses." ChemInform 27, no. 44 (2010): no. http://dx.doi.org/10.1002/chin.199644010.

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24

Smilyk, Vitaliy, Sergii Fomaniyk, Gennady Kolbasov, Igor Rysetskiy, and Michael Danilov. "PROPERTIES AND PROSPECTS OF USAGE OF ELECTROCHROMIC MATERIALS." Ukrainian Chemistry Journal 90, no. 5 (2024): 3–20. https://doi.org/10.33609/2708-129x.90.5.2024.3-20.

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The review considers phenomenon of electrochromism, presents the main characteristics of electrochromic materials, such as spectral efficiency and switching speed. The features of their preparation influence of synthesis methods and impurities on electrochromic characteristics are shown. From a large number of electrochromic materials, oxides of some transition metals are considered, in which changes in redox states between p– and d– sublevels are observed. These are oxides W, Ni, Nb, V, each of which has its own special electrochromic properties. For example, due to the rapid intercalation un

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25

Gorokh, G. G., I. A. Taratyn, A. N. Pligovka, A. A. Lazavenka, and A. I. Zakhlebayeva. "AUTOELECTRONIC CATHODES BASED ON ARRAYS OF NIOBIUM-OXIDE COLUMNAR NANOSTRUCTURES FOR FIELD EMISSION DISPLAYS." Doklady BGUIR, no. 7 (125) (December 7, 2019): 51–58. http://dx.doi.org/10.35596/1729-7648-2019-125-7-51-58.

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The article discusses the prospects of creating controlled field-effect cathodes based on arrays of columnar oxide niobium nanostructures for field emission displays. Geometrical models of field-emission cathodes and vacuum elements have been developed and investigated. The distribution of the electric field in the vacuum device at various distances between the cathode and the anode, the applied voltages between them, the shape and microgeometry of the cathodes were obtained. The optimal geometric parameters of nanostructured autoelectronic cathodes and matrices of these were calculated based

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26

Krasovskyy, V. P., and N. A. Krasovskaya. "Surface modification of basalt fibers, oxide and carbon materials for improvement their wetting with low-melting melts." Uspihi materialoznavstva 2022, no. 4-5 (2022): 99–105. http://dx.doi.org/10.15407/materials2022.04-05.099.

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The effect of metal coatings and coverings on wetting of substrates by In, Sn, Pb in vacuum 1—2•10-3 Pa in the temperature range 400—700 C was studied by the sessile drop method using the capillary purification method of melt. Substrates of hot-polished basalt material, MPG-6 graphite, composite materials based on high-modulus carbon fibers, tapes and fabrics used. Vanadium, niobium, copper and nickel metals were chosen for the coatings, which were sprayed on the materials by electron beam evaporation of metals in vacuum, and titanium, nickel powders for the coatings were used. The nature of

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27

Okunev, Maksim A., Iurii V. Stulov, Anton R. Dubrovskii, Ol'ga V. Makarova, and Sergei A. Kuznetsov. "SYNTHESIS OF NANOSIZED NIOBIUM PENTOXIDE FILMS FOR CREATING A CRYOGENIC GYROSCOPE ROTOR." Bulletin of the Saint Petersburg State Institute of Technology (Technical University) 66 (2023): 11–16. http://dx.doi.org/10.36807/1998-9849-2023-66-92-11-16.

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A rotor coated by niobium is used for creating a cryogenic gyroscope. It is necessary to protect the coating from interaction with the environment (oxygen) that to extend the service life of the device. The protective coatings must have high dielectric characteristics, which can be achieved by electrochemical oxidation of niobium. The goal of this study is to determine optimal conditions for synthesis of nanoscale films of niobium pentoxide. Oxidation of niobium was carried out using an AUTOLAB PGSTAT 20 potentiostat with the GPES software package (version 4.4) at a temperature of 573 K using

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28

Inoue, Yasushi, Hiromichi Yamazaki, and Mitsuji Ikeda. "Studies of the Hydrous Niobium(V) Oxide Ion Exchanger. V. Effect of Heat Treatment on the Sodium Isotopic Exchange Rates between Hydrous Niobium(V) Oxide in Na+Form and Aqueous Solutions." Bulletin of the Chemical Society of Japan 62, no. 1 (1989): 262–66. http://dx.doi.org/10.1246/bcsj.62.262.

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29

Wilhelm, Michael E., Michael H. Anthofer, Robert M. Reich, et al. "Niobium(v) chloride and imidazolium bromides as efficient dual catalyst systems for the cycloaddition of carbon dioxide and propylene oxide." Catal. Sci. Technol. 4, no. 6 (2014): 1638–43. http://dx.doi.org/10.1039/c3cy01057k.

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Imidazolium bromides combined with niobium(v) choride were used as catalyst system for the reaction of CO<sub>2</sub> with epoxides to cyclic carbonates. The variation of the cation structure strongly affects the properties of the imidazolium salt and therefore the catalytic activity.

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30

Wang, Xu, and Pooi See Lee. "Titanium doped niobium oxide for stable pseudocapacitive lithium ion storage and its application in 3 V non-aqueous supercapacitors." Journal of Materials Chemistry A 3, no. 43 (2015): 21706–12. http://dx.doi.org/10.1039/c5ta04776e.

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Developing high energy density supercapacitors is of great importance to the transportation, consumer electronics and micro-grid energy storage sectors. We introduce a new electrode combination with titanium-doped orthorhombic phase niobium oxide and polyaniline-single wall carbon nanotubes. The organic electrolyte based supercapacitor achieves an energy density over 110.3 Wh kg<sup>−1</sup> at 150 W kg<sup>−1</sup>.

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31

Campos, Elvio A., and Yoshitaka Gushikem. "Composite Membrane of Niobium(V) Oxide and Cellulose Acetate: Preparation and Characterization." Journal of Colloid and Interface Science 193, no. 1 (1997): 121–26. http://dx.doi.org/10.1006/jcis.1997.5051.

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32

Ali, Md Ayub, S. M. A. Hakim Siddiki, Kenichi Kon, and Ken-ichi Shimizu. "A Heterogeneous Niobium(V) Oxide Catalyst for the Direct Amidation of Esters." ChemCatChem 7, no. 17 (2015): 2705–10. http://dx.doi.org/10.1002/cctc.201500601.

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Fitzner, Krzysztof, and Michał Stępień. "Determination of the Dielectric Constant of Niobium Oxide by Using Combined EIS and Ellipsometric Methods." Materials 16, no. 2 (2023): 798. http://dx.doi.org/10.3390/ma16020798.

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Combining ellipsometric and EIS methods, the dielectric constant ε for the oxide Nb2O5 at room temperature was determined. At first, the linear dependence between anodization voltage and oxide thickness was established in the form d = 2.14 (± 0.05) × U + 12.2 (± 1.7) nm in the range of anodizing potentials 0–50 V. Next, assuming the equivalent circuit corresponds to one, the capacitance C of the dense oxide layer was measured. All results taken together gave the value of dielectric constant ε = 93 ± 5.

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34

Störmer, H., E. Ivers-Tiffée, C. Schnitter, and D. Gerthsen. "Microstructure and dielectric properties of nanoscale oxide layers on sintered capacitor-grade niobium and V-doped niobium powder compacts." Zeitschrift für Metallkunde 97, no. 6 (2006): 794–801. http://dx.doi.org/10.3139/146.101305.

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35

Masloboeva, S. M., N. V. Sidorov, M. N. Palatnikov, L. G. Arutyunyan, and P. G. Chufyrev. "Niobium(V) oxide doped with Mg2+ and Gd3+ cations: Synthesis and structural studies." Russian Journal of Inorganic Chemistry 56, no. 8 (2011): 1194–98. http://dx.doi.org/10.1134/s0036023611080183.

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36

Yang, Fenglin, and Vladimir Hlavacek. "Kinetic study of chlorination of niobium (V) oxide with chlorine and carbon monoxide." Powder Technology 102, no. 2 (1999): 177–83. http://dx.doi.org/10.1016/s0032-5910(98)00191-0.

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37

Kumagai, N., I. Ishiyama, and K. Tanno. "Electrochemical and structural characteristics of niobium(V) oxide in a rechargeable lithium battery." Journal of Power Sources 20, no. 3-4 (1987): 193–98. http://dx.doi.org/10.1016/0378-7753(87)80111-8.

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38

Kuparowitz, Martin, Vlasta Sedlakova, and Lubomir Grmela. "Leakage Current Degradation Due to Ion Drift and Diffusion in Tantalum and Niobium Oxide Capacitors." Metrology and Measurement Systems 24, no. 2 (2017): 255–64. http://dx.doi.org/10.1515/mms-2017-0034.

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AbstractHigh temperature and high electric field applications in tantalum and niobium capacitors are limited by the mechanism of ion migration and field crystallization in a tantalum or niobium pentoxide insulating layer. The study of leakage current (DCL) variation in time as a result of increasing temperature and electric field might provide information about the physical mechanism of degradation. The experiments were performed on tantalum and niobium oxide capacitors at temperatures of about 125°C and applied voltages ranging up to rated voltages of 35 V and 16 V for tantalum and niobium ox

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39

Stawicka, Katarzyna, Maciej Trejda, and Maria Ziolek. "Insight into Active Centers and Anti-Coke Behavior of Niobium-Containing SBA-15 for Glycerol Dehydration." Catalysts 11, no. 4 (2021): 488. http://dx.doi.org/10.3390/catal11040488.

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Niobium containing SBA-15 was prepared by two methods: impregnation with different amounts of ammonium niobate(V) oxalate (Nb-15/SBA-15 and Nb-25/SBA-15 containing 15 wt.% and 25 wt.% of Nb, respectively) and mixing of mesoporous silica with Nb2O5 followed by heating at 500 °C (Nb2O5/SBA-15). The use of these two procedures allowed obtaining materials with different textural/surface properties determined by N2 adsorption/desorption isotherms, XRD, UV-Vis, pyridine, and NO adsorption combined with FTIR spectroscopy. Nb2O5/SBA-15 contained exclusively crystalline Nb2O5 on the SBA-15 surface, whe

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40

Denofre, Silvia, Yoshitaka Gushikem, Sandra C. de Castro, and Yoshio Kawano. "Stability and surface acidity of niobium(V) oxide grafted on a silica gel surface." Journal of the Chemical Society, Faraday Transactions 89, no. 7 (1993): 1057. http://dx.doi.org/10.1039/ft9938901057.

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41

Inoue, Yasushi, Hiromichi Yamazaki, Kazushi Okada, and Kazuhiko Morita. "Studies of the Hydrous Niobium(V) Oxide Ion Exchanger. II. Affinity for Various Cations." Bulletin of the Chemical Society of Japan 58, no. 10 (1985): 2955–59. http://dx.doi.org/10.1246/bcsj.58.2955.

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Demirkol, N. "Bioactivity Properties and Characterization of Commercial Synthetic Hydroxyapatite - 5 wt.% Niobium (V) Oxide - 5 wt.% Magnesium Oxide Composite." Acta Physica Polonica A 132, no. 3 (2017): 786–88. http://dx.doi.org/10.12693/aphyspola.132.786.

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Gulo, Fakhili. "RbNb₆Cl₁₂O₂: CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES." Indonesian Journal of Chemistry 8, no. 1 (2010): 7–12. http://dx.doi.org/10.22146/ijc.21640.

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A novel niobium oxychloride cluster compound, RbNb6Cl12O2 was obtained by solid state synthesis from stoichiometric mixture of RbCl, Nb2O5, NbCl5 and Nb powder, heated at 675 °C. Its structure was determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic system (a = 6.8097(4) Å, b = 11.6700(9) Å, c = 12.5090(9) Å, ß = 101.337(4) °, V = 974.68(12) Å3, and Z = 2) with the space group of P21/c. The cluster framework of this compound is based on units connected via oxide ligands in the a-direction with two Nb-O linkages between adjacent clusters, which resembles intercluste

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44

Li, Guo, Yang Hongyan, Ye Zhifei, Zhu Boyu, Zhou Peng, and Yang Yong. "Fluorine Doped Niobium Carbides as Nonprecious Metal Electrocatalysts for Methanol Oxidation Reaction in Acidic and Alkaline Solutions." Journal of Physics: Conference Series 2956, no. 1 (2025): 012016. https://doi.org/10.1088/1742-6596/2956/1/012016.

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Abstract Catalytic performance of methanol oxidation reaction (MOR) on transition metal carbides (TMCs) can be enhanced by doping fluorine. Herein, we report the successful synthesis of reduced graphene oxide (rGO) supported fluorine doped NbC nanoparticles (NbFxC NP/rGO) as efficient non-noble metal electrocatalyst for MOR in both acidic and basic solutions. As result, NbFxC NP/rGO exhibits onset potentials of 0.33 V vs. SCE and -0.30 V vs. Hg/HgO in acidic medium and alkaline medium, respectively. It is even superior to that of Pt/C and PtRu/C in acid.

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Kawano, Takuto, Hirofumi Kakemoto, and Hiroshi Irie. "Niobium(V) oxide with added silver as a thermoelectric material prepared by spark plasma sintering." Materials Letters 156 (October 2015): 94–97. http://dx.doi.org/10.1016/j.matlet.2015.04.148.

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DEOLIVEIRA, A., C. DASILVEIRA, S. DECAMPOS, E. DECAMPOS, and E. CARASEK. "Niobium(V) oxide coated on thin glass–ceramic rod as a solid phase microextraction fiber." Talanta 66, no. 1 (2005): 74–79. http://dx.doi.org/10.1016/j.talanta.2004.09.028.

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de Sairre, Mirela Inês, Érika Soares Bronze-Uhle та Paulo Marcos Donate. "Niobium(V) oxide: a new and efficient catalyst for the transesterification of β-keto esters". Tetrahedron Letters 46, № 15 (2005): 2705–8. http://dx.doi.org/10.1016/j.tetlet.2005.01.158.

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48

Inoue, Yasushi, Hiromichi Yamazaki, and Yuzo Matsuda. "Studies of the Hydrous Niobium(V) Oxide Ion Exchanger. III. The Effect of Heat Treatment." Bulletin of the Chemical Society of Japan 58, no. 11 (1985): 3225–28. http://dx.doi.org/10.1246/bcsj.58.3225.

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Kominami, Hiroshi, Kazuhide Oki, Masaaki Kohno, Sei-ichi Onoue, Yoshiya Kera, and Bunsho Ohtani. "Novel solvothermal synthesis of niobium(v) oxide powders and their photocatalytic activity in aqueous suspensions." Journal of Materials Chemistry 11, no. 2 (2001): 604–9. http://dx.doi.org/10.1039/b008745i.

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Lehmann, Tanja S., та Rainer Niewa. "Electrochemical synthesis of transition metal oxide nitrides with ε-TaN, δ-NbN and γ′-Mo2N structure type in a molten salt system". Zeitschrift für Naturforschung B 75, № 1-2 (2020): 33–40. http://dx.doi.org/10.1515/znb-2019-0022.

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AbstractThe three nitrides ε-TaN, δ-NbN and γ′-Mo2N have been synthesized electrochemically from the elements at 450°C in a molten salt mixture LiCl/KCl:Li3N. For all compounds the working electrode consisting of a tantalum, niobium or molybdenum foil was anodically polarized and the system was fed with dry nitrogen. The applied constant voltage was 2.5 V (for ε-TaN), 2.2 V (for δ-NbN), and 2.8 V (for γ′-Mo2N). Chemical analysis on N and O resulted in compositions of TaN0.81(1)O0.13(2), NbN1.17(2)O0.28(1) and MoN0.88(1)O0.11(1), respectively. Lattice parameters of ε-TaN refined by the Rietveld

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