12035-98-2Relevant articles and documents
Crossed-beam chemiluminescent reactions of titanium and vanadium with O2
Parson, J. M.,Geiger, L. C.,Conway, T. J.
, p. 5595 - 5605 (1981)
Titanium and vanadium have been reacted with O2 under crossed-beam conditions to form the TiO A 3Φ, B 3Π, C 3Δ, and E 3Π states and the VO B 4Π state.By heating and seeding the O2 nozzle beam the Ti reaction has been studied at relative collision energies of 4.0, 7.6, and 13.3 kcal/mol, and the V reaction at 3.9, 6.9, 7.6, and 13.1 kcal/mol.Computer simulations of the spectra yield relative rates for formation of TiO(A) and VO(B) vibrational states, which are slightly more excited than the prior model predictions.Increasing the relative collision energy does increase the production of all the electronically excited states, but the VO B state population does not increase as quickly as expected from the prior model.The dependence of the chemiluminescent signals on the metal source temperature suggests reaction of ground state Ti to formTiO(A), but metastable V to form VO (B).
A clean process of preparing VO as LIBs anode materials via the reduction of V2O3 powder in a H2 atmosphere: Thermodynamic assessment, isothermal kinetic analysis, and electrochemistry performance evaluation
Jin, Xin,Lv, Xuewei,Pei, Guishang,Xiang, Junyi,Zhong, Dapeng
, (2020)
VO is one of the most promising anode materials for lithium ion batteries (LIBs). Herein, we present the clean preparation of VO powder via reduction of V2O3 powder under high-purity H2. Thermodynamic calculation and V–O phase diagram analysis were carried out to ensure reasonable oxygen potential conditions. Isothermal reduction experiments and kinetic analysis using thermogravimetric analysis (TGA) were then performed at 1623 K, 1648 K, and 1673 K under a pure H2 gas flow. The reduction of V2O3 powder appears to obey an unreacted shrinking core model and can be divided into two steps. The first step was controlled by a chemical reaction, the kinetics of which can be described as G(α) = [-ln(1-α)]1/3 with an apparent activation energy of 107.3 kJ·mol?1. The second stage was controlled by gas diffusion, the kinetics of which can be described as G(α) = [1-(1-α)1/3]1/2 with an apparent activation energy of 45.5 kJ·mol?1. Powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) also were employed for characterizing the morphology of the prepared VO powder. As a result, when the VO was served as the LIBs anode material, the resulting electrodes exhibited a high specific capacity (843 mAh·g?1 after 30 cycles) and remarkable cyclic stability.
Finholt, A. E.,Bond, A. C.,Wilzbach, K. E.,Schlesinger, H. I.
, p. 2692 - 2696 (1947)
Kinetics of Neutral Transition-Metal Atoms in the Gas Phase: Oxidation of Sc(a2D), Ti(a3F), and V(a4F) by NO, O2, and N2O
Ritter, David,Weisshaar, James C.
, p. 4907 - 4913 (1990)
The oxidation kinetics of gas-phase, ground-state Sc(a2D), Ti(a3F), and V(a4F) atoms by NO, O2, and N2O is studied in 0.80 Torr of He buffer gas at 300 +/- 5 K.The metal atoms are created in a hollow cathode sputtering source before entering a fast flow reactor.The reactions are monitored by laser-induced fluorescence of the metal atom reactant.All nine M + OX -> MO + X bimolecular oxygen atom transfer reactions are inefficient at 300 K with rate constants in the range 0.45 x 10-12 to 10 x 10-12 cm3s-1.This indicates activation energies not larger than2-4 kcal mol-1 in all cases.The substantial range of reaction rates for a particular metal with the three different oxidants contrasts with the remarkable similarity of rates for all three metal atoms with each oxidant.The rate constants for reaction of each metal with the three oxidants fall in the order kNO > kO2 > kN2O, opposite to the normal expectation of decreasing activation energy with increasing exothermicity.The rate constant ordering kSc > kV > kTi for each oxidant and the small activation energies are interpreted in terms of an electron-transfer mechanism from neutral M + OX reactant surfaces to ion-pair M+O- + X product surfaces.
Refinement of the V-O phase diagram in the range 25-50 at % oxygen
Davydov,Rempel
, p. 47 - 54 (2009)
The boundaries of the V14O6 + V x O z two-phase region in the V-O system at temperatures from ? 1050 to ? 1650 K have been determined experimentally. The V-O phase diagram has been refined in the range 25-50 at
Roscoe, H. E.
, p. 322 - 350 (1868)
Magnetic properties of (Mn1-xVx)Sb2O4 with one-dimensional magnetic arrays
Abe,Yoshii,Kitazawa
, p. 429 - 432 (2002)
The magnetic properties of mangan-vanadium antimonate solid solution (Mn1-xVx)Sb2O4 (x = 0 to 0.6) with the tetragonal TX2O4 structure (T = Pb4+, Sn4+; X = Pb2+ or T = Mn2+, Fe2+, Co2+, Ni2+; X = Sb3+, As3+) were investigated. Magnetic measurements on the polycrystalline specimens have shown that characteristic ferromagnetic behavior appears in the case that x is larger than 0.1, whereas the final compound MnSb2O4 is an antiferromagnet with the Neel temperature TN = 60.5 K. The magnetic isotherms of the solid solution at low temperatures show ferromagnetic jumps at low fields but do not tend to saturate up to 5 T. The zero-field cooling magnetic susceptibility has a maximum at Tc = 57 K, which is independent of both the vanadium concentration x and the frequencies of the applied external fields.
Frandsen, M.
, p. 5046 - 5046 (1952)
Development and structure elucidation of new VO2+, Mn2+, Zn2+, and Pd2+ complexes based on azomethine ferrocenyl ligand: DNA interaction, antimicrobial, antioxidant, anticancer activities, and molecular docking
Aljohani, Enas T.,Shehata, Mohamed R.,Alkhatib, Fatmah,Alzahrani, Seraj Omar,Abu-Dief, Ahmed M.
, (2021)
An organometallic azomethine ferrocenyl ligand (FCAP) and its transition metal complexes ([M (FCAP)2], where M = VO2+, Mn2+ cations, and [M (FCAP) (CH3COO? or NO3?)], where M = Zn2+/s
The structure of an ultrathin VOx (x ≈1) film grown epitaxially on TiO2 (110)
Della Negra, Michela,Sambi, Mauro,Granozzi, Gaetano
, p. 118 - 128 (2000)
The analysis by means of multiple scattering cluster (MSC) calculations of full 2π V 2p, Ti 2p and O 1s X-ray photoelectron diffraction (XPD) patterns from an ultrathin film (～4 ML) of VOx (x≈1) deposited on the (1 × 1)-TiO2 (110) (rutile) surface leads to a detailed determination of the structure and orientation of the overlayer and of its epitaxial relationship with the substrate. The comparison of XPD experimental data to theoretical simulations confirms the NaCl-like stacking of the overlayer which is suggested by the direct observation of the experimental 2π plots and reveals its (100) orientation. The [001] azimuth of the overlayer is aligned with the [112] direction on the substrate surface and the overlayer experiences an orthorhombic tensile strain (+ 7%) in order to match the substrate epitaxially, with a consequent 12-16% vertical interlayer spacing contraction. The atomic scale morphology of the (1 × 1)-TiO2 (110) surface induces a strong buckling in the overlayer along the [110] substrate direction [0.5±0.1 A?].
XPS study of vanadium surface oxidation by oxygen ion bombardment
Alov,Kutsko,Spirovová,Bastl
, p. 1628 - 1631 (2006)
Oxidation of vanadium metal surfaces at room temperature by low-energy oxygen ion beams is investigated by X-ray photoelectron spectroscopy (XPS). It is observed that ion-beam irradiation of clean V results in formation of thin oxide layer containing vanadium in oxidation states corresponding to VO, V2O3, VO2 and V2O5 oxides. The composition of the products of ion-beam oxidation depends markedly on oxygen ion fluence. The results of angle-resolved XPS measurements are consistent with a structure of oxide film with the outermost part enriched in V2O5 and VO2 oxides and with V2O3 and VO oxides located in the inner region of the oxide layer.
Cheung, A. S.-C.,Taylor, A. W.,Merer, A. J.
, p. 391 - 409 (1982)
