Relevant bibliographies by topics / Cobalt oxides

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Cobalt oxides'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 May 2022

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Journal articles on the topic "Cobalt oxides"

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Gogoi, M., and B. K. Das. "Synthesis of Nanostructured Cobalt Oxides using Cobalt(II) Fumarate Hydrate as Metal-Organic Precursor." Asian Journal of Chemistry 32, no. 12 (2020): 3144–50. http://dx.doi.org/10.14233/ajchem.2020.22970.

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A series of nanostructured cobalt oxides have been prepared from a metal-organic precursor viz. [Co(fum)(H2O)4]·H2O (fum = fumarate) by using capping agents, ethylene glycol and polyethylene glycol via thermal and solvothermal decomposition in ethanol and also by doping with RuCl3·xH2O via solvothermal route. The nano oxides were characterized by IR, UV-vis spectroscopy, powder XRD, SEM and TEM analysis. The nano oxides exhibit varied morphologies and particle sizes. The TEM images reveal homogeneously distributed particles for all the oxides. The band gap energy values the Ru-doped cobalt oxide was found to be lower than the generally accepted values.
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Kesavan, V., D. Dhar, Y. Koltypin, N. Perkas, O. Palchik, A. Gedanken, and S. Chandrasekaran. "Nanostructured amorphous metals, alloys, and metal oxides as new catalysts for oxidation." Pure and Applied Chemistry 73, no. 1 (January 1, 2001): 85–91. http://dx.doi.org/10.1351/pac200173010085.

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The oxidation of cyclohexane with molecular oxygen in the presence of isobutyraldehyde catalyzed by nanostructured iron and cobalt oxides and iron oxide supported on titania has been studied. Nanostructured cobalt oxide on MCM-41 is found to be efficient for catalytic aerobic epoxidation of olefins.
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Ved', M. V. "Synthesis and functional properties of mixed titanium and cobalt oxides." Functional materials 24, no. 4 (December 18, 2017): 534–40. http://dx.doi.org/10.15407/fm24.04.534.

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Koshibae, W., K. Tsutsui, and S. Maekawa. "Thermopower in cobalt oxides." Physical Review B 62, no. 11 (September 15, 2000): 6869–72. http://dx.doi.org/10.1103/physrevb.62.6869.

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Neha, Neha, Ram Prasad, and Satya Vir Singh. "Simultaneous Catalytic Oxidation of a Lean Mixture of CO-CH4 over Spinel Type Cobalt Based Oxides." Bulletin of Chemical Reaction Engineering & Catalysis 15, no. 2 (June 12, 2020): 490–500. http://dx.doi.org/10.9767/bcrec.15.2.6499.490-500.

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A series of nickel-cobalt bimetal oxides in varying molar ratios and its single metal oxides were synthesized by reactive calcination of coprecipitated basic-carbonates. Several characterization techniques, such as: Bruneuer Emmett Teller (BET), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infra Red (FTIR), and Hydrogen Temperature Programmed Reduction (H2-TPR), were performed over the oxides. Activities of oxides were evaluated in methane total oxidation in the presence or the absence of CO. The best catalytic performance was observed over NiCo catalyst with a Ni/Co molar ratio of 1:1, and the complete conversion of CO-CH4 mixture was achieved at 390 °C. Moreover, the presence of carbon monoxide improves CH4 total oxidation over nickel-cobalt mixed oxides. Structural analysis reveals that the insertion of nickel into the spinel lattice of cobalt oxide causes the structural disorder, which probably caused the increase of the amount of octahedrally coordinated divalent nickel cations that are responsible for catalytic activity. Stability of the best-performed catalyst has been tested in the two conditions, showing remarkable long-term stability and thermal stability, however, showed deactivation after thermally ageing at 700 °C. Copyright © 2020 BCREC Group. All rights reserved
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Andreev, Andrey S., Serguey F. Tikhov, Aleksey N. Salanov, Svetlana V. Cherepanova, Olga B. Lapina, Vasiliy A. Bolotov, Yuriy Yu Tanashev, Jean Baptiste d’Espinose de Lacaillerie, and Vladislav A. Sadykov. "Design of Al2O3/CoAlO/CoAl Porous Ceramometal for Multiple Applications as Catalytic Supports." Advanced Materials Research 702 (May 2013): 79–87. http://dx.doi.org/10.4028/www.scientific.net/amr.702.79.

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Porous ceramometal Al2O3/CoAlO/CoAl was studied by set of physicochemical techniques such as XRD, SEM, internal field59Co and27Al MAS NMR, and porosity measurements. They revealed the cermet containing three parts. First, cobalt-free large porous alumina particles which surrounded by the second oxide part representing spinel CoxAl3-xO4(x=1,2,3) oxides. And third, oxygen-free metallic part consists of cobalt metal particles covered by Co-Al oxide protecting the metallic part from oxidation. Porosity measurements ascertained high porosity (60%) and good SSA (122 m2/g). Also the enhanced adsorption of microwaves due to metallic particles randomly distributed in oxides was found.
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Kallumottakkal, Muhammed, Mousa I. Hussein, Yousef Haik, and Tarik Bin Abdul Latef. "Functionalized-CNT Polymer Composite for Microwave and Electromagnetic Shielding." Polymers 13, no. 22 (November 12, 2021): 3907. http://dx.doi.org/10.3390/polym13223907.

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In this research work, we studied the microwave properties of multi-wall carbon nanotube (MWCNT) surface functionalized with metallic oxides composites. Three different concentrations (5%, 10%, and 20%) of metallic oxides were used, namely cobalt, iron, and cobalt ferrite. The surface-decorated CNTS were impregnated into polyurethane (PU) matrix. The surface-decorated MWCNTs and the MWCNTs-PU composites were characterized using electron microscopy. The dielectric properties of the samples are studied using an open-ended coaxial probe technique in a wide frequency range of (5–50 GHz). The metallic oxide-decorated surface MWCNTs-PU composites demonstrated different microwave-frequency absorption characteristics depending on the concentration of the metallic oxides.
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Sakhnenko, Nikolay, Maryna Ved’, and Ann Karakurkchi. "PECULIARITIES OF COBALT CONTAINING OXIDE COATINGS FORMATION ON SILUMIN." Ukrainian Chemistry Journal 86, no. 1 (February 5, 2020): 12–21. http://dx.doi.org/10.33609/0041-6045.86.1.2020.12-21.

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The process of mixed oxide coatings formation on a high-silicon aluminum alloy in a cobalt-containing pyrophosphate electrolyte by the plasma-electrolytic oxidation (PEO) method is studied. It was shown that AL25 chemical composition heterogeneity causes the consumption of a part of the anode current to homogenize the treated surface, which is reflected in minimizing the content of doping components at the initial processing stage. It was established that the growth of mixed oxides Al2O3·CoxOy relative mass is a function of time with a maximum at 55 minutes. The chemical, phase composition and surface morphology of the formed oxide layer depend on the oxidation time. The catalytic component content in the surface oxides varies from 0.2 to 23.3 at.% with an increase in processing time of 10 to 60 minutes. Maximum cobalt incorporation into the oxide layer occurs at PEO of 35–50 minutes, while the silicon content in the surface layers does not exceed 2 at.%, which is favorable for the catalytic properties. The cobalt oxide, preferably Co3O4, incorporation in the alumina α-Al2O3 matrix is visualized by the blue-violet color steroidal surface structures in the sites of micro-arc discharges. The alumina cobalt oxide mixture layers are characterized by a developed micro-globular surface which consists of spheroid conglomerate with an average size of 1–2 microns. There are some amorphous phases in the structure of mixed oxides due to non-equilibrium PEO conditions. The set of detected factors is a prerequisite for the high catalytic properties of oxide coatings. A promising field of Al2O3·CoxOy systems application is intra-cylinder catalysis in internal combustion engines.
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Mammadyarova, S. J. "SYNTHESIS AND CHARACTERIZATION OF COBALT OXIDE NANOSTRUCTURES. A BRIEF REVIEW." Azerbaijan Chemical Journal, no. 2 (June 29, 2021): 80–93. http://dx.doi.org/10.32737/0005-2531-2021-2-80-93.

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The newest achievement in the synthesis of cobalt oxide nanoparticles are considered. Cobalt oxide nanoparticles have attracted a great attention due to their uncommon properties and application in a supercapacitor, optoelectronic device, Li-ion battery gas sensor and electrochromic devices. Recently, nanostructured transition metal oxides with valuable properties have become a new class of materials for many technological fields. Cobalt oxide nanoparticles obtained from various precursors show different size distribution as well as different optical, electrical, magnetic, and electrochemical properties. A reduction in particle size to nanometer-scale leads to changes in properties compared to bulk ones due to quantum size effects. Depending on the application area, the choice of an appropriate synthesis method for nanoparticles with desirable properties is a crucial factor. This work aims to provide additional information on the synthesis methods and properties of cobalt oxide nanoparticles
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FOUAD, O. A., and M. S. EL-SHALL. "MICROWAVE IRRADIATION ASSISTED GROWTH OF Cu, Ni, Co METALS AND/OR OXIDES NANOCLUSTERS AND THEIR CATALYTIC PERFORMANCE." Nano 07, no. 05 (October 2012): 1250034. http://dx.doi.org/10.1142/s1793292012500348.

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Copper, nickel and cobalt metals and oxides needle-like shape nanoclusters have been synthesized successfully by chemical reduction in solution without using a surfactant. XRD analyses showed that copper and nickel metals could be synthesized in a short time period by a microwave irradiation (MWI) — assisted step wise reduction of metal ions in basic solution using hydrazine as a reducing agent whereas cobalt was mainly precipitated in the form of either hydroxide or oxide. TEM images showed that the size of needle-like shape nanoclusters varying from about 5 nm to few hundred nanometers length. On the other hand, copper and cobalt showed high catalytic activity toward CO oxidation than that of nickel. The mechanism of catalytic oxidation reactions over unsupported metals and oxides are also discussed.
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Dissertations / Theses on the topic "Cobalt oxides"

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Curelea, Sergiu. "Non stoichiometric effects in cobalt rich complex oxides." Caen, 2012. http://www.theses.fr/2012CAEN2031.

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This memory is devoted to the research and characterization of new complex cobalt-rich oxides, by transmission electron microscopy (TEM) techniques. A part of the work presents the study of a “114”-type compound, non-stoichiometric at the level of the oxygen content, YBaCo4O7+δ, for the case when δ has a value of approximately 1. 5. When an extra oxygen content is applied to the original, stoichiometric material, it has been found during the TEM studies that these extra oxygen atoms cause the formation of a complex superstructure that has been characterized in terms of the lattice parameters. This is accompanied by a reduction of the original trigonal symmetry to an orthorhombic one. Layered, cobalt-rich materials in the Ba–Co–O system, formed by the intergrowth of the hexagonal perovskite, more exactly the Ba2Co9O14 and Ba3Co10O17 compounds, are presented in the second part of the memory. These materials are part of a larger structural family, which corresponds to the [BaCoO3]n[BaCo8O11] chemical formula, where n denotes the thickness (number) of hexagonal perovskite blocs [BaCoO3] in their structure. The second part of the formula represents the chemical composition of another block, common to all these materials. Which is a CdI2-type one, responsible for the magnetic properties at low temperature, that these compounds exhibit. Concerning the n = 2 term, it is impossible to synthesize the pure phase, systematically obtaining secondary phases (like BaCoO3 or Co3O4). Chemical doping, by replacing a part of the cobalt species with iron, and using the sol-gel technique, leads to obtaining a nearly pure phase Ba3(Fe,Co)10O17, which has been analyzed by X-ray diffraction, neutron diffraction and transmission electron microscopy.
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Yar-Mukhamedova, G. Sh, M. V. Ved, A. V. Karakurkchi, and N. D. Sakhnenko. "Mixed alumina and cobalt containing plasma electrolytic oxide coatings." Thesis, IOP Publishing Ltd, 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/30798.

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Principles of plasma electrolytic oxidation of the AL25 aluminum alloy in diphosphate alkali solutions containing cobalt(2+) cations are discussed. It has been established that a variation in the concentration of the electrolyte components provides the formation of mixed-oxide coatings consisting of the basic matrix materials and the cobalt oxides of different content. An increase in the cobalt oxide content in the coating is achieved by the variation in electrolysis current density as well as the treatment time due to both the electrochemical and thermo-chemical reactions at substrate surface and in spark region. Current density intervals that provide micro-globular surface formation and uniform cobalt distribution in the coating are determined. The composition and morphology of the surface causes high catalytic properties of synthesized materials, which confirmed the results of testing in model reaction CO and benzene oxidation as well as fuel combustion for various modes of engine operation.
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Kroll, Thomas. "On the electronic structure of layered sodium cobalt oxides." Doctoral thesis, [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1182443937257-74133.

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El-Shinawi, Hany Zakaria Ibrahim. "Synthesis and characterization of cobalt-containing perovskite-type oxides." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/625/.

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A number of cobalt-containing perovskite-type oxides were synthesized and characterized in this study. All materials were half-doped with cobalt in their B-sites, i.e. contain the Co0.5M0.5 B-site state where M = Fe, Mn, Cr, Ni; the materials adopted single layered, double-layered and simple perovskite-type structures. The materials La2 xSrxCo0.5M0.5O4 (M = Fe, Cr) have shown enhanced stability under reducing conditions (10% H2/N2, up to 1000 ºC) with the formation of oxygen deficient compounds, while no evidence for oxygen hyperstoichiometry was observed under oxidizing conditions. Materials such La1.2Sr0.8Co0.5Mn0.5O4.1 and La1.7Sr0.3Co0.5Ni0.5O4.08, however, exhibit oxygen hyperstoichiometry under oxidizing conditions and also withstand reducing conditions via formation of oxygen deficiency. Oxygen vacancies were disordered and confined to the equatorial planes of the single layered structure in all materials, while oxygen hyperstoichiometry was accommodated in the interstitial (0, 0 .5, 0.25) sites of the tetragonal structure. In La1+xSr2 xCoMnO7-δ, oxygen vacancies were confined to the common apex of the double layered structure. The new brownmillerite phase LaSrCoFeO5 was synthesized and fluorination produced the new oxyfluoride LaSrCoFeO5F. Magnetic interactions between Co2+(3+) ions and ions such as Fe3+, Mn3+, Cr3+, Ni2+ in different perovskite-type structures were also studied and a range of magnetically ordered materials, at low and room temperatures, were investigated.
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Kroll, Thomas. "On the electronic structure of layered sodium cobalt oxides." Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A24889.

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The discovery of an unexpectedly large thermopower accompanied by low resistivity and low thermal conductivity in NaxCoO2 raised significant research interest in these materials and let to a number of experimental and theoretical investigations. This interest has strongly been reinforced by the discovery of superconductivity in the hydrated compound Na0.35CoO2 •1.3H2O in 2003, and thus, NaxCoO2 experiences an again increasing attention. The similarity of the Na cobaltates to the high temperature superconductors (HTSC) - both are transition metal oxides and adopt a layered crystal structure with quasi-two-dimensional (Cu,Co)O2 layers - is an important aspect of the research activities. In contrast to the HTSC cuprates however, the CoO2 layers consist of edge sharing CoO6 octahedra which are distorted in such a way that the resulting local symmetry is trigonal. The trigonal coordination of the Co sites results in geometric frustration which favours unconventional electronic ground states. The geometrically frustrated CoO2 sublattice also exists in the nonhydrated parent compound NaxCoO2, which has been investigated in this work. The intercalation of water into the parent compound is expected to have little effect on the Fermi surface beside the increase in two dimensionality due to the effect of expansion. Upon lowering the symmetry from cubic to trigonal, the t2g states split into states with eg_and a1g symmetry. Measurements of polarisation and temperature dependent soft X-ray absorption have been performed on a wide doping range of NaxCoO2 single crystals. Beside the Co L_2,3-edges, the O K-edge and the Na K-edge have been measured. These measurements show strong polarisation dependencies especially for the excitations into the lower lying a1g energy level. In addition to that, also an unexpected polarisation dependence for higher energies has been observed, which should be absent in trigonal symmetry. These results point towards a deviation of the local trigonal symmetry of the CoO6 octahedra, which is temperature independent in a temperature range between 25 K and 372 K. This deviation was found to be different for Co3+ and Co4+ sites, which leads to a polaronic electron transport. Furthermore, a strong hybridisation between the Co and O ions has been found. In order to shed further light on the electronic structure of NaxCoO2, the electronic spectrum of a CoO6 cluster has been calculated including all interactions between 3d orbitals as well as hopping processes between Co and O and O and O ions. The ground state for two electronic occupations in the cluster (i.e. Co3+ and Co4+) that correspond nominally to all O in the O−2 oxidation state, and Co+3 or Co+4 has been obtained. Then, all excited states obtained by promotion of a Co 2p electron to a 3d electron, and the corresponding matrix elements are calculated. A fit of the observed experimental spectra is good and points out a large Co-O covalence and cubic crystal field effects, that result in low spin Co 3d configurations. The results indicate that the effective hopping between different Co atoms plays a major role in determining the symmetry of the ground state in the lattice. Remaining quantitative discrepancies with the XAS experiments are expected to come from composition effects of itineracy in the ground and excited states. Beside these points, results of photoemission spectroscopy, magnetisation measurements as well as resonant and non-resonant X-ray diffraction using high energy X-rays are shown and discussed.
Die Entdeckung unerwartet großer Thermokraft bei gleichzeitigem niedrigem Widerstand und niedriger thermischen Leitfähigkeit in NaxCoO2 führte zu einem großen wissenschaftlichem Interesse an diesen Materialien und zu einer großen Anzahl an experimentellen und theoretischen Arbeiten. Dieses Interesse steigerte sich noch einmal nach der Entdeckung von Supraleitung in der hydrierten Verbindung Na0.35CoO2 •1.3H2O im Jahre 2003. Die Ähnlichkeit der Na Kobaltate zu den Hochtemperatur-Supraleitern (HTSL) – beides sind Übergangsmetalloxide mit einer geschichteten Kristallstruktur in der quasi zwei dimensionale (Cu,Co)O2 Ebenen enthalten sind – ist ein wichtiger Aspekt moderner wissenschaftlicher Arbeiten. Im Gegensatz zu den HTSL Kupraten bestehen die CoO2 Ebenen aus CoO6 Oktaedern die über ihre Kanten verbunden sind und in der Art verzerrt sind, dass die resultierende Symmetrie trigonal ist. Die trigonale Anordnung der Co Plätze führt zu einer geometrischen Frustration und unkonventionellen elektronischen Grundzuständen. Diese geometrisch frustrierten CoO2 Untergitter existieren ebenfalls in den nicht hydrierten Mutterverbindungen NaxCoO2, welche in dieser Arbeit untersucht wurden. Interkalierung von Wasser in die Mutterverbindung hat nur einen kleinen Einfluss auf die Fermi Oberfläche und führt zu einem Anstieg des zwei dimensionalen Charakters durch den Effekt der Ausdehnung. Durch Verminderung der Symmetrie von kubisch zu trigonal splitten die vormals entarteten t2g Zustände auf in Zustände mit eg und a1g Symmetrie. Zur Bestimmung der elektronischen Struktur von NaxCoO2 wurden polarisations- und temperaturabhängige Messungen der Röntgenabsorption im weichen Röntgenbereich für einen großen Dotierungsbereich durchgeführt. Neben den Co L_2,3-Kanten wurden auch die O K-Kante und die Na K-Kante gemessen. Sie zeigen eine starke Polarisationsabhängigkeit speziell für Anregungen in die niederenergetischen a1g Level. Zusätzlich wurde eine unerwartete Polarisationsabhängigkeit bei höheren Energien gefunden, die für trigonalen Symmetrie so nicht auftauchen dürfte. Diese Ergebnisse weisen auf eine Abweichung von der lokalen trigonalen Symmetrie der CoO6 Oktaeder hin, welche Temperatur unabhängig ist in einem Temperaturbereich zwischen 25 und 372 Kelvin. Diese Abweichung ist unterschiedlich für Co3+ und Co4+ Ionen was wiederum auf einen polaronischen Transport hinweist. Zusätzlich wird deutlich, dass eine starke Co-O Hybridisierung existieren muss. Um weiteres Informationen über die elektronische Struktur von NaxCoO2 zu erhalten, wurde das elektronische Spektrum eines CoO6 Oktaeders berechnet in dem alle Wechselwirkungen zwischen 3d Orbitalen sowie Hüpfprozesse zwischen Co und O sowie O und O Ionen enthalten sind. Der Grundzustand für zwei elektronische Besetzungen in einem Cluster (d.h. Co3+ und Co4+) wurde bestimmt für O Ionen mit einer nominellen O-2 Oxidation sowie Co3+ und Co4+ Ionen. Im angeregten Zustand werden die entsprechenden Anregungen eines Co 2p Elektrons in einen unbesetzten 3d Zustand berücksichtigt und die entsprechenden Matrixelemente berechnet. Ein Fit an den experimentellen Daten ist gut und weist auf eine starke Co-O Kovalenz und auf einen starken Einfluss des kubischen Kristallfeldes hin, der zu einer Low-Spin Co 3d Konfiguration führt. Die Ergebnisse zeigen, dass ein effektives Hüpfen zwischen benachbarter Co Ionen eine große Rolle für die Symmetrie des Grundzustandes im Gitter spielt. Quantitative Unterschiede zwischen den experimentellen und theoretischen Daten kommen anscheinend von itineranten Effekten im Grund- und angeregten Zustand. Zusätzlich zu den oben kurz beschriebenen Ergebnissen werden in dieser Arbeit weitere Ergebnisse der Photoemissionsspektroskopie, der Magnetisierung sowie aus resonanter und nicht resonanter Röntgenbeugung mit harter Röntgenstrahlung gezeigt und diskutiert.
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Hao, Yalin. "Continuous Hydrothermal Production of Iron Oxide (Fe[subscript 2]0[subscript 3]) and Cobalt Oxide (Co[subscript 3]O[subscript 4])." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/11217.

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Sugiyama, J., H. Nozaki, Y. Ikedo, K. Mukai, D. Andreica, A. Amato, J. H. Brewer, et al. "Evidence of Two Dimensionality in Quasi-One-Dimensional Cobalt Oxides." American Physical Society, 2006. http://hdl.handle.net/2237/8880.

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Rafique, Hafiz Muhammad. "Resonant and high resolution photoemission of rare-earth cobalt oxides." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/resonant-and-high-resolution-photoemission-of-rareearth-cobalt-oxides(33377a1a-670c-413d-a38f-73c52115b5e5).html.

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LnBaCo2O5+δ (Ln-112) where Ln = lanthanide element; 0 ≤ δ ≤1 and LnBaCo4O7+δ (Ln-114) are highly correlated cobalt oxides. Synchrotron photoemission spectroscopy of LnBaCo2O5+δ (Ln = Gd, Dy, Dy1-xTbx) and LnBaCo4O7 (Ln = Yb) has been undertaken at the UK Synchrotron Radiation Source (Daresbury Laboratory).During the photoemission experiments, the samples were observed to be contaminated due to residual gases inside the main vacuum chamber. The surface degradation of the samples is studied using the difference spectra generated from the valence band spectra of freshly scraped and contaminated samples and the nature of contaminated species on these samples is identified in the light of the reviewed literature. High-resolution photoemission is carried out to study the metal-insulator (MI) transition in double perovskites LnBaCo2O5+δ (Ln = Gd, Dy, Dy1-xTbx - Ln-112; 0 ≤ δ ≤ 1) as a function of temperature. The high-resolution photoemission results of single crystal samples of GdBaCo2O5.5, DyBaCo2O5.5 and Dy1-xTbxBaCo2O5+δ show that the temperature-based MI transitions in these compounds occur in the 300-400 K temperature range. A post-growth oxygen annealing treatment for as-grown single crystals of Ln-112 is necessary, achieving oxygen contents close to 5.50, to observe a marked nonmetal-to-metal transition. Resonant photoemission is used to identify the atomic parentage of the valence band states. A comparison of the electronic structure of LnBaCo2O5+δ (Ln = Gd, Dy, Dy1-xTbx - Ln-112; 0 ≤ δ ≤ 1) and LnBaCo4O7 (Ln = Yb - Ln-114) single-crystal surfaces is made using synchrotron photoemission spectroscopy. In both cases, the states close to the Fermi energy are found to be of mixed Co 3d/O 2p character, and the comparison allows identification of states due to low spin Co³⁺ in octahedral environments. The contributions from Ln elements to the valence band are found at higher binding energies.
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Iablokov, Viacheslav. "Manganese and cobalt oxides as highly active catalysts for CO oxidation." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209847.

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Durant ce travail de thèse, d’importants paramètres concernant la synthèse de matériaux catalytiques nanostructurés à base de manganèse et d’oxydes de cobalt ont été établis. La corrélation entre les propriétés structurales du catalyseur et l’activité catalytique, ainsi que le mécanisme d’oxydation du CO ont été analysé au moyen d’une grande variété de méthodes expérimentales physico-chimiques.

De l’oxyde de manganèse non-stœchiométrique (MnOx) a été préparé par décomposition spinodale d’oxalate de manganèse trihydraté en ayant recours à la technique d’oxydation programmée en température (TPO). Tant l’analyse quantitative relatives à ces données TPO que les résultats obtenus par spectroscopie de structure au front d’absorption des rayons X (XANES), ainsi que par spectroscopie des photoélectrons X (XPS) ont permis d’estimer la stœchiométrie de l’oxyde avec un x situé entre 1.61 et 1.67. En accord avec à la fois la surface spécifique élevée et la combinaison d’isothermes d’adsorption/désorption de type I et IV, la microscopie électronique à transmission à haute résolution (HRTEM) démontre la présence de micro-bâtonnets caractéristiques et « imbriqués » les uns dans les autres, accompagné de particules nanocristalline à l’extrémité de ces bâtonnets.

Les découvertes faites par spectroscopie infra-rouge de réflexion diffuse par transformée de Fourier (DRIFTS), par études isotopiques et cinétiques suggère que l’adsorption des deux molécules, CO et O2, est suivie par leur réaction en surface via des intermédiaires de type carbonate/formate, pour finalement produire du CO2. Nous supposons un mécanisme de type Mars-van Krevelen où l’oxygène appartenant à la structure de type MnOx prend part dans l’oxydation catalytique du CO à basse température. Cependant, ces espèces mobiles d’oxygènes ne faisaient pas partie du cœur de phase du réseau d’oxyde, et de ce fait, ont été capables de « sauter » sur la surface et approvisionner les espèces oxygénées nécessaires à l’oxydation du CO déjà adsorbé.

Une structure spinelle d’oxyde de cobalt Co3O4 dans lequel le cobalt présente deux états de valence (+2 et +3) a été choisie pour élucider l’effet de la taille des particules sur l’activité lors de la réaction d’oxydation du CO. Tout d’abord, des nanoparticules monodispersées de cobalt métallique présentant une déviation standard en taille inférieure à 8% ont été synthétisées à partir de carbonyle de cobalt (Co2(CO)8) par une méthode optimisée «d’injection chaude». Un contrôle de la taille des nanoparticules dans la gamme 3 à 11 nm a pu être obtenu en variant la température d’injection du carbonyle de cobalt dans une solution de dichlorobenzène et d’acide oléique. La microscopie électronique à transmission (TEM) nous montre que ces particules de cobalt sont quasiment hémisphériques. Ensuite, de la silice poreuse (de type MCF-17) a été imprégnée par des nanoparticules de cobalt, et ensuite activée par TPO menant à des nanoparticules d’oxyde de cobalt. Des études par diffraction des rayons X (XRD) et spectroscopie des photoélectrons X (XPS) ont démontré la structure spinelle Co3O4. Finalement, l’activité des catalyseurs obtenus vis-à-vis de l’oxydation du monoxyde de carbone fut mesurée à 423 K et ce en fonction de la taille des particules. Les particules de Co3O4 présentant une taille allant de 5 à 8 nm se sont révélées les plus actives. Ceci peut s’expliquer par une plus grande mobilité des atomes d’oxygène en surface des nanoparticules d’oxyde de cobalt.


Doctorat en Sciences
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FERREIRA, JUNIOR JOSE M. "Síntese e caracterização elétrica de materiais com comportamento termistor à base de óxidos de manganês, de níquel de cobalto." reponame:Repositório Institucional do IPEN, 2007. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11600.

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Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
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Books on the topic "Cobalt oxides"

1

Raveau, Bernard, and Md Motin Seikh. Cobalt Oxides. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527645527.

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Malik, Mohammad Suleman. Comparative studies of the electronic properties of copper tellurite glasses containing nickel, cobalt and lutetium oxides and cupric chloride. Uxbridge: Brunel University, 1989.

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Boose, C. A. Cobalt oxide spectral selective coatings. Luxembourg: Commission of the European Communities Directorate-General Information Market and Innovation, 1985.

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Shukri, Rashid Jaber Asa'd. Supported oxide catalysts: Cobalt oxide and molybdena on titania. Uxbridge: Brunel University, 1989.

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Bailey, Steven John. A study of the catalytic properties of unpromoted and promoted cobalt-iron oxide spinels. Uxbridge: BrunelUniversity, 1991.

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The World Market for Cobalt Oxides, Cobalt Hydroxides, and Commercial Cobalt Oxides: A 2004 Global Trade Perspective. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007 Import and Export Market for Cobalt Oxides, Cobalt Hydroxides, and Commercial Cobalt Oxides in China. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007 Import and Export Market for Cobalt Oxides, Cobalt Hydroxides, and Commercial Cobalt Oxides in United States. ICON Group International, Inc., 2006.

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Raveau, Bernard, and Motin Seikh. Cobalt Oxides: From Crystal Chemistry to Physics. Wiley & Sons, Incorporated, John, 2012.

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Raveau, Bernard, and Motin Seikh. Cobalt Oxides: From Crystal Chemistry to Physics. Wiley & Sons, Incorporated, John, 2012.

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Book chapters on the topic "Cobalt oxides"

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Terasaki, Ichiro. "Layered Cobalt Oxides: Correlated Electrons for Thermoelectrics." In Thermoelectric Nanomaterials, 51–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37537-8_3.

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Fujii, Takenori, and Ichiro Terasaki. "Block-Layer Concept for the Layered Cobalt Oxide: A Design for Thermoelectric Oxides." In Chemistry, Physics, and Materials Science of Thermoelectric Materials, 71–87. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4419-9278-9_5.

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Okimoto, Yoichi, Tadahiko Ishikawa, and Shin-ya Koshihara. "Photoexcited State and Ultrafast Dynamics in Spin-Crossover Cobalt Oxides." In Spin-Crossover Cobaltite, 103–22. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7929-5_4.

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Koshibae, Wataru. "Thermoelectric Properties of Cobalt Oxides and Other Doped Mott Insulators." In Spin-Crossover Cobaltite, 159–76. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7929-5_7.

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Stokłosa, Andrzej, and Stefan S. Kurek. "Cobalt-Doped Magnetite – (Fe1−x Co x )3±δO4." In Structure and Concentration of Point Defects in Selected Spinels and Simple Oxides, 117–29. First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003106166-8.

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Stokłosa, Andrzej, and Stefan S. Kurek. "Cobalt-Wüstite – Halite (Fe1−x Co x )1−δO." In Structure and Concentration of Point Defects in Selected Spinels and Simple Oxides, 283–301. First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003106166-22.

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Stokłosa, Andrzej, and Stefan S. Kurek. "Cobalt-Doped Hausmannite – (Mn1−x Co x )3±δO4." In Structure and Concentration of Point Defects in Selected Spinels and Simple Oxides, 187–96. First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003106166-14.

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Liu, Hong Quan, Ying Song, and Fu Ping Wang. "Progress in Researches on the Layered Cobalt Oxides for Thermoelectric Devices." In Key Engineering Materials, 814–17. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.814.

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Liu, Hongfei, and Greta R. Patzke. "Cobalt-Manganese Spinel Oxides as Visible-Light-Driven Water Oxidation Catalysts." In Nanostructured Materials and Nanotechnology VII, 75–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118807828.ch7.

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França, Y. V., T. C. Porfirio, E. N. S. Muccillo, and R. Muccillo. "Synthesis of Ceramic Powders Based on Manganese, Cobalt and Nickel Oxides." In Materials Science Forum, 395–400. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-423-5.395.

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Conference papers on the topic "Cobalt oxides"

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Shao, Wenyao, and Mengwen Yan. "Solvothermal synthesis of cobalt oxides nanocrystals." In 2ND INTERNATIONAL CONFERENCE ON COMPOSITE MATERIALS AND MATERIAL ENGINEERING (ICCMME 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.4983602.

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Tomohito Nakano, Wataru Kobayashi, Ryoji Funahashi, Kenji Sugiura, Hiromichi Ohta, Kunihito Koumoto, and Ichiro Terasaki. "Nonlinear thermoelectric properties of layered cobalt oxides." In 2007 26th International Conference on Thermoelectrics (ICT 2007). IEEE, 2007. http://dx.doi.org/10.1109/ict.2007.4569438.

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Wang, Weiran, Yan Zhao, and Xueying Han. "Raman shift of rare earth cobalt oxides." In 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, edited by Yudong Zhang, José Sasián, Libin Xiang, and Sandy To. SPIE, 2010. http://dx.doi.org/10.1117/12.865213.

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Guo, Kun, Ahalapitiya H. Jayatissa, and Ambalangodage C. Jayasuriya. "Nanocrystalline cobalt oxides for carbon nanotube growth." In Optics East 2007, edited by Nibir K. Dhar, Achyut K. Dutta, and M. Saif Islam. SPIE, 2007. http://dx.doi.org/10.1117/12.735285.

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Jadhav, S. L., A. L. Jadhav, V. S. Jamdade, K. R. Kharat, A. A. Deshmane, and A. V. Kadam. "Controlled Synthesis of Cobalt Oxide Electrode by Electrodeposition for Supercapacitor Application." In National Conference on Relevance of Engineering and Science for Environment and Society. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.118.56.

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Cobalt oxide (Co3O4) electrodes were prepared on conductive stainless still (SS) substrate using cobalt nitrate as a cobalt source by implementing simple and cost-effective chemical electrodeposition method and here, characterized for structural and electrochemical analysis for supercapacitor applications. The effect of different deposition potential on capacitance and charging-discharging stability of cobalt oxide electrode were studied. X-ray diffractions confirms the face centered cubic crystal structure of Co3O4 electrodes. Electrochemical capacitive analysis of cobalt oxide electrode was studied in 1MKOH aqueous electrolyte solution. The observed maximum specific capacitance attained with cobalt oxide was 273.3 F/g at scan rate 5mV/s. The observed specific power, specific energy and coulomb efficiency were 12.12W/kg, 74.75 Wh/kg, and 99.63%, respectively. The cycling stability of the cobalt oxides shows 62% up to 500 cycles.
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Joshi, J. H., D. D. Khunti, M. J. Joshi, and K. D. Parikh. "Penn model and Wemple-DiDomenico single oscillator analysis of cobalt sulfide nanoparticles." In FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982117.

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Savaliya, Chirag, Hetal Kundalia, Brinda Vyas, Malay Udeshi, Sadaf Jethva, Savan Katba, Jayshukh Marakna, D. D. Pandya, N. A. Shah, and D. G. Kuberkar. "Modification in the dielectric behavior of cobalt doped ZnO synthesized by co-precipitation method." In FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982133.

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Serebryannikov, Sergej V., Anatoliy P. Cherkasov, Sergey V. Serebryannikov, Pavel I. Konshin, Irina K. Epaneshnikova, Andrei M. Belevtsev, Vasiliy L. Kruchkov, and Anton S. Boldyreff. "Ferrospinel ceramic containing oxides of titanium and cobalt." In Millimetre Wave and Terahertz Sensors and Technology XIII, edited by Neil A. Salmon and Frank Gumbmann. SPIE, 2020. http://dx.doi.org/10.1117/12.2583929.

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Dey, Ranajit, Aradhana Singh, and P. K. Bajpai. "Structural and phonon behavior of simultaneous A-site and B-site doped cobalt ferrite nano-powders." In FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982119.

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Acharya, Prashant, and Harshida Parmar. "Size dependent mechanical and magnetic properties of Zn substituted cobalt ferrite below A-site percolation threshold." In FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982156.

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Reports on the topic "Cobalt oxides"

1

Bai, C. S., S. Soled, K. Dwight, and A. Wold. Preparation and Characterization of Dispersed 'Cobalt Oxide' Supported on Gamma-Al2O3. Fort Belvoir, VA: Defense Technical Information Center, December 1990. http://dx.doi.org/10.21236/ada231269.

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Morris D. Argyle. Supported, Alkali-Promoted Cobalt Oxide Catalysts for NOx Removal from Coal Combustion Flue Gases. Office of Scientific and Technical Information (OSTI), December 2005. http://dx.doi.org/10.2172/913563.

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