112 Result(s)
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Article
T. A. Ivanova
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Article
Lability of spin state of Fe(III) complexes with tetradentate Schiff’s bases
[FeLX2]Y [L = N,N'-ethylenebis(salicylimine) (salen), N,N'-ethylenebis(acetylacetonylimine) (acen), or N,N'-ethylenebis(3-methyloxysalicylimine) (vanen); X = imidazole or N-methylimidazole; Y = BF4, ClO4, or BPh4
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Specific features of spin-variable properties of [Fe(acen)pic2]BPh4 · nH2O
The [Fe(acen)pic2]BPh4 · nH2O compound has been synthesized and studied in the temperature interval of 5–300 K by the methods of EPR and magnetic susceptibility. The existence of ferromagnetic interactions betwee...
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Lattice dynamics of α-TeO2 in the DFT-LCAO-B3LYP approximation
Ab initio DFT analysis of phonon frequencies at the center of the Brillouin zone, dispersion of phonons, phonon state density, effective Born charges, and IR reflection and Raman spectra of α-TeO2 is performed in...
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Article
Gold mineral flotation versus preparation conditions in a complexing agent belonging to dithiazinanes
To gain the efficient and optimized application of agents MTH and ETH belonging to dithiazinanes to float gold from complex ores the investigation was undertaken on complexing conditions in water environment a...
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Sulfhydryl phosphorus-containing collectors in flotation of copper–nickel platinum-group metals
The analysis involves influence of sulfhydryl phosphorus-containing collectors (SPC) on flotation of copper–nickel ore-bearing metals from platinum group. Efficiency of SPC and butyl xanthate combination is il...
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ALON: Synthesis and thermal properties
The aluminum oxynitride γ phase was synthesized by the high-temperature sintering of aluminum oxide and nitride. The effect of synthesis conditions, first of all, temperature, pressure, and time, on the compos...
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Composition of multicomponent heracleum extracts and its effect on flotation of gold-bearing sulfides
Using the proprietary method, the authors have obtained flotation agent BO—extract of atomized leaves and stalks of Heracleum sosnowskyi (hogweed), and analyzed its composition. Qualitative tests, thin-layer chro...
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Complexing collecting agent for selective flotation of chalcopyrite
Under analysis is interaction between 1-phenyl-2,3-dimethylaminopyrazolone-5 (AMD) and copper in solution and on the surface of chalcopyrite. It is found that AMD experiences chemical adsorption on the surface...
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First-principle study of structural and mechanical properties of hexagonal polytypes of diamond
The values of unit-cell parameters; C-C bond lengths; elastic constants c ij and s ij ; elastic moduli B, G, ...
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Preparation and liquid-crystalline properties of mono- and binuclear complexes of Fe(III) with pentadentate Schiff’s base
Liquid-crystalline mono-and binuclear complexes of Fe(III) based on pentadentate Schiff’s base, N,N′-bis(2-hydroxy-4-octadecyloxybenzyliden)-1,7-diamino-4-azaheptane, have been prepared for the first time. The ef...
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Lattice dynamics and the incommensurability of the structures of hexagonal polytypes of diamond
In the density functional theory approximation, we have calculated the phonon dispersions and the densities of vibrational states of the 2H, 3C, 4H, 6H, and 8H hexagonal polytypes of diamond. We have found that a...
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Ab initio calculation of the structural and elastic properties, anisotropy, and hardness of nitrogen-doped diamond
The elastic properties of nitrogen-doped diamond are studied with the use of the density functional theory in the plane-wave basis, the electron density gradient approximation, and ultrasoft pseudopotentials. ...
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Physicochemical effect of modified diethyldithiocarbamate on the surface of auriferous sulfide minerals in noble metal ore flotation
Complexing processes between modified diethyldithiocarbamate (DDC) and copper, iron and gold ions in solution, as well as adsorption of modified solution on auriferous pyrite and arsenopyrite are analyzed usin...
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New experimental evaluation techniques for selectivity of collecting agents for gold and platinum flotation from fine-impregnated noble metal ores
It is proposed to apply nanosize Au and Pt particles to ground mineral particles for the analysis of flotation and adsorptive properties of new reagents. The authors have obtained specimens of pyrite, arsenopy...
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Thermo- and photoinduced properties of the Fe(III) complexes with the pentadentate ligand according to the EPR data
Compounds [Fe(Salten)L]BPh4 (Salten = N,N-bis[(2-oxyphenyl)methylene]-4-azaheptane-1,7-diamine; L = Him (I) and Pic (II)) were studied by the EPR method in the temperature range from 5 to 300 K. The thermoinduced...
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Experimental investigation of the 19F(n, α)16N reaction excitation function in the neutron energy range of 4 to 7.35 MeV
The interaction of neutrons with light nuclei study is of interest for understanding nuclear-reaction mechanisms. Fluorine nuclei are worth particular attention because they are abundant in the core of the pro...
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Cross-section of the production of tritium in interactions of neutrons with 10B nuclei
Tritium production reactions are important from the standpoint of ensuring the safe operation of nuclear power plants. 10B isotopes are widely used both for controlling the power level of nuclear reactors and for...
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The cross-section investigation of (n, α) reaction on chromium isotopes
Cross-sections of the (n, α) reaction on chromium isotopes are of great importance for determining the radiation hardness of stainless steel, which is widely used in nuclear reactors. The EXFOR library contains a...
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Investigating fast neutron interaction with chromium nuclei
A new technique based on a Frisch grided ionization chamber and digital signal processing unit is used for low-background measurements of a cross section of the (n, α) reaction proceeding on a solid target mou...
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New experimental data on the 10B(n, αt)4He reaction
A new technique is described that makes it possible to detect reaction products with the escape of charged particles occurring on components of working gas under the action of fast neutrons. This technique is ...
