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Properties of chromium niobium oxide and iron tantalum oxide 2605 constant temperature, a magnetic moment develops and increases with time by 30-50 x. At higher fields (2.5 T) the moment increases by approximately 10%. At temperatures above - 30 K the magnetic moment saturates almost immediately after the magnetic
Jul 01, 1976 Magnetic properties and structure of chromium niobium oxide and iron tantalum oxide Christensen, A. N.; Johanssen, T.; Lebech, B. Abstract. Publication: Journal of Physics C Solid State Physics. Pub Date: July 1976 DOI: 10.1088/0022-3719/9/13/019 Bibcode: 1976JPhC....9.2601C full text sources ...
Photoelectron spectroscopy has been conducted for a series of (CrO3)n− (n = 1–5) clusters and compared with density functional calculations. Well-resolved photoelectron spectra were obtained for (CrO3)n− (n = 1–5) at 193 nm (6.424 eV) and 157 nm (7.866 eV) photon energies, allowing for accurate measurements of the electron binding energies, low-lying electronic excitations for n
Herein I report the synthesis of a new family of organometallic reduced mesoporous niobium oxide composites with mixed oxidation-state organometallic nanowires in the pores and investigate their electronic and magnetic properties. This is a wonderful system which allows us to systematically study one-dimensional molecular metals based on the respective
Jan 28, 2003 Cr 2 O 3 nanoparticles of controlled particle size were prepared by calcination of a precursor, Cr(OH) 3, obtained by precipitation with sodium hydroxide.Samples were characterized by transmission electron microscopy and x-ray diffraction. Average particle sizes ranged from 20 to 200 nm. The magnetic properties of Cr 2 O 3 nanoparticles show the presence of a net magnetic
Niobium oxide cluster ions are produced by a laser-induced plasma source. The cluster distribution, collision-induced dissociation (CID), and cluster reactivities are studied using a triple-quadrupole mass spectrometer. CID experiments on the cluster ions Nb3O7-9+, Nb4O9-11+, and Nb5O12+ reveal that their building blocks are Nb2O5, NbO2+, NbO3, Nb3O7+, O, and O2,
Mar 01, 2011 Under the reaction conditions employed, four iron oxides are commonly formed. These are Fe 3 O 4 (magnetite), γ- Fe 2 O 3 (maghemite), α-Fe 2 O 3 (hematite) and α-FeO(OH) (goethite). Among them two magnetite and maghemite are magnetic (Perez et al., 1998).Fig. 2A and B shows the X-ray diffraction patterns of MWCNTs and MWCNTs/nano-iron oxide
Jul 01, 2016 1. Introduction. Niobium oxides can lead to many different and interesting properties, making it a very versatile group of materials. Specifically, niobium oxides have been showing great potentiality in many technological applications such as solid electrolytic capacitors, transparent conductive oxides, photochromic devices, memristors, dye-sensitized solar cells
Feb 13, 2015 Chromium(IV) oxide, CrO 2, is a black synthetic magnetic solid. It once was widely used in magnetic tape emulsion. With the increasing popularity of CDs and DVDs, the use of CrO 2 has declined. However, it is still used in data tape applications for enterprise-class storage systems and is considered by numerous oxide and tape manufacturers to ...
Oct 09, 2007 Vanadium oxide clusters, (V 2 O 5) n, have been predicted to possess interesting polyhedral cage structures, which may serve as ideal molecular models for oxide surfaces and catalysts.Here we examine the electronic properties of these oxide clusters via anion photoelectron spectroscopy for (V 2 O 5) n-(n = 2−4), as well as for the 4d/5d species, Nb 4 O
Photoelectron spectroscopy has been conducted for a series of (CrO3)n− (n = 1–5) clusters and compared with density functional calculations. Well-resolved photoelectron spectra were obtained for (CrO3)n− (n = 1–5) at 193 nm (6.424 eV) and 157 nm (7.866 eV) photon energies, allowing for accurate measurements of the electron binding energies, low-lying electronic excitations for n = 1 ...
May 16, 2002 Mesoporous niobium oxide potassium fulleride composites were synthesized by the treatment of mesoporous niobium oxide with 0.3, 0.6, or 1.0 equiv of potassium naphthalene followed by stirring with either excess K3C60 or C60. The reaction of potassium-reduced mesoporous niobium oxide with neutral C60 is the first reported example of a mesoporous oxide functioning as an electron donor
The niobium reduction goes by intermediary stages of lower oxide formation (NbO 2 and NbO). It is important that at temperatures above 900 K, a part of Nb 2 O 5 is evaporated, while NbO 2 and NbO evaporate at higher temperatures. Niobium oxide vapor is adsorbed on the carbon and niobium carbide particles, where niobium is reduced.
Structure and magnetic and electric properties of bismuth niobates doped with d elements: IV. Magnetic behavior of chromium-containing solid solutions with the structure
Feb 13, 2015 Chromium(IV) oxide, CrO 2, is a black synthetic magnetic solid. It once was widely used in magnetic tape emulsion. With the increasing popularity of CDs and DVDs, the use of CrO 2 has declined. However, it is still used in data tape applications for enterprise-class storage systems and is considered by numerous oxide and tape manufacturers to ...
Niobium and tantalum containing Y zeolites prepared via the one-pot synthesis showed the FAU structure, as evidenced by XRD diffraction patterns (Fig. 1 – the numbers in the symbols indicate the assumed Si/M ratio). The zeolite structure is confirmed for the two zeolites of both Si/M ratios (64 and 32); hence the synthesis of faujasite samples was successful.
Nov 22, 2001 Compositional Studies on the Electronic and Magnetic Properties of Potassium Fulleride Mesoporous Niobium Oxide Composites. Chemistry of Materials 2002, 14 (6) , 2774-2781. DOI: 10.1021/cm020057f. C. Lorber. Vanadium Organometallics☆.
Oct 09, 2007 Vanadium oxide clusters, (V 2 O 5) n, have been predicted to possess interesting polyhedral cage structures, which may serve as ideal molecular models for oxide surfaces and catalysts.Here we examine the electronic properties of these oxide clusters via anion photoelectron spectroscopy for (V 2 O 5) n-(n = 2−4), as well as for the 4d/5d species, Nb 4 O 10-and Ta 4 O 10-.
Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. The chemical symbol for Niobium is Nb. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium
Mar 13, 2018 Though cobalt has magnetic properties, implants such as coronary stents made of cobalt-chromium alloy have tested safe during an MRI. The alloy also tests safe for larger items, such as knee and hip replacements.
Structure, magnetic, and electric properties of bismuth niobates doped with d elements: I. Magnetic behavior of chromium-containing solid solutions of low-and high-temperature bismuth orthoniobate
ABOUT THIS HANDBOOK: Metal Oxide Nanostructures and Their Applications is the world's first multivolume reference covering a wide variety of advanced research and emerging developments in the field.The book series cover theoretical and experimental aspects of metal oxide nanostructures dealing with materials design, modeling, synthesis, fabrication, processing, spectroscopy characterization ...
Magnetic Properties Susceptibilities (Typical) Chart All inorganic particle / powder substances exhibit magnetic phenomena in the forms of diamagnetism, ferromagnetism or paramagnetic at any given temperature
The magnetic susceptibility and electrophysical properties of chromium-containing Bi5Nb3−3x Cr3x O15−δ solid solutions with the perovskite-like structure were studied.
The magnetic susceptibility and electrophysical properties of chromium-containing Bi5Nb3−3x Cr3x O15−δ solid solutions with the perovskite-like structure were studied.
Niobium and tantalum containing Y zeolites prepared via the one-pot synthesis showed the FAU structure, as evidenced by XRD diffraction patterns (Fig. 1 – the numbers in the symbols indicate the assumed Si/M ratio). The zeolite structure is confirmed for the two zeolites of both Si/M ratios (64 and 32); hence the synthesis of faujasite samples was successful.
Magnetic Properties Susceptibilities (Typical) Chart All inorganic particle / powder substances exhibit magnetic phenomena in the forms of diamagnetism, ferromagnetism or paramagnetic at any given temperature
Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. The chemical symbol for Niobium is Nb. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite.
The main function of Chromium in tempering structure is to improve the hardenability, make steel has good comprehensive mechanical performance after quenching tempering, produce chromium carbide in carburizing steel so as to improve the wear resistance of the material surface. ... in the form of carbides and oxide particles, it can refine the ...
ABOUT THIS HANDBOOK: Metal Oxide Nanostructures and Their Applications is the world's first multivolume reference covering a wide variety of advanced research and emerging developments in the field.The book series cover theoretical and experimental aspects of metal oxide nanostructures dealing with materials design, modeling, synthesis, fabrication, processing,
Feb 22, 2011 Graphene oxide has been synthesized by Hummers method and has oxygenated groups on the surface of the molecule. There is no specific structure for GO, but structural and morphologic characterization gives an idea of the GO structure [51] (Fig. 4.1B).
Mar 13, 2018 Before you receive an MRI, a technician will ask you to remove any metal items you are wearing, such as jewelry, glasses or belt buckles. You should tell her about any medical implants you have. The MRI machine's powerful magnetic field attracts ferrous, or iron-containing, metals and can cause serious injury.
Jun 01, 2012 The elements, having the same crystal structure as that of ferrite (cubic body centered – BCC), lower the A 4 point and increase the A 3 temperature.. These elements lower the solubility of carbon in austenite, causing increase of amount of carbides in the steel.. The following elements have ferrite stabilizing effect: chromium (Cr), tungsten (W), Molybdenum
The magnetic properties and the magnetocaloric effect are presented for the perovskite-related oxide SrFe0.5Co0.5O3 prepared using electrochemical oxidation. ... A detailed study of the structure ...
Therefore, in the present study, chromium content was varied to evaluate the effect of chromium on microstructure, mechanical and wear resistance properties of Fe alloy based coating material. Further, the research work also focused on finding the effect of using HVOF coating on microstructure and mechanical performance of coating materials.
Structure and properties. Cr 2 O 3 has the corundum structure, consisting of a hexagonal close packed array of oxide anions with 2 ⁄ 3 of the octahedral holes occupied by chromium. Similar to corundum, Cr 2 O 3 is a hard, brittle material (Mohs hardness 8 to 8.5).
Niobium. Niobium is a rare, soft, malleable, ductile, gray-white metal. It has a body-centered cubic crystalline structure and in its physical and chemical properties it resembles tantalum.It must be placed in a protective atmosphere when processed at even moderate temperatures because it tends to react with oxygen, carbon, the halogens, nitrogen, and sulfur.
Sep 01, 2019 Regarding the chromium (III) oxide sample, the structure is described in a rhombohedra system with an R-3c space group while the tungsten (VI) oxide material adopts a monoclinic structure with a P2 1 /n space group. Some of the Miller planes have been attributed in particular to the most intense and better resolved diffraction peaks.
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