Abstract Efficient method for the directed synthesis of ZrO2–Er2O3 luminescent material in nanocrystalline state has been developed. Monodisperse samples of cubic modification with particle size from 5 to 71 nm depending on synthesis conditions have been synthesized. Luminescence spectra due to 4I11/2 → 4I15/2 and 4I13/2 → 4I15/2 transitions of Er3+ ions have been registered upon their excitation by

Abstract In this study, two new complexes of Cd(II) 4-fluorobenzoate (4-FB)/3-fluorobenzoate (3-FB) with 3-hydroxypyridine (3-HPY) have been synthesized and structural characterizations have been performed by using elemental analysis, FT-IR spectroscopy, and single-crystal X-ray diffraction methods. In both complexes, the metal atom is chelated by two carboxylate groups from two 4- or 3-fluorobenzoate

Abstract A method for preparing fully brominated sulfonium derivatives of the closo-decaborate anion with functional amino groups (n-Bu4N)[2-B10Br9S((CH2)nNH2)2]– (n = 1–3) has been developed. The method is based on the interaction between sulfonium derivatives of the closo-decaborate anion with phthalimide groups (n-Bu4N)[2-B10Br9S((CH2)npht)2]– (n = 1–3) and elemental bromine in acetonitrile in an

Abstract To study chemical transport and refine synthetic routes, single crystals of vanadium and zirconium diselenides were grown by the chemical transport reaction method using I2 and Cl2 as transporting agents. The thermodynamic parameters of chemical transport have been evaluated, and the mass transfer direction in a growth ampoule has been determined. The phase composition of the samples has been

Abstract Thermodynamics of boehmite formation upon hydrothermal treatment of micron-size particles of hydrargillite and γ-Al2O3 at 200°C in various media has been studied at various treatment times. The presence of surface-bound water with low evaporation enthalpy value at the initial stages of precursor hydrothermal treatment has been revealed. It has been shown that, irrespective of precursor and

Abstract Samples of a solid solution aluminum oxonitride (γ-AlON) of spinel structure with different ratios of components (Al2O3 and AlN) were prepared by the sol–gel technique combined with high-temperature solid-state synthesis at 1750°C in a nitrogen atmosphere. The X-ray diffraction study of polycrystalline samples was performed by the Rietveld method. It was shown that the crystal structure of

Abstract A simple chemical route of sol gel method has been followed to synthesize cadmium sulphide (CdS) nanoparticles and cadmium sulphide@zincphosphate (CdS@Zn3(PO4)2 nanocomposites. The structural, morphological, and optical studies have been carried out by using X-ray powder diffraction, FESEM, TEM, PL, UV and CIE graphs. A density functional theory (DFT) study has also been done to compare the

Abstract Chemical interactions of salts in the four-component reciprocal system comprised of chlorides, molybdates, and tungstates of sodium and strontium are studied by the ion-balance method. DTA heating curves feature exotherms due to the interaction of Na2EO4 + SrCl2 (E = Mo,W) and Na2MoO4 + Na2WO4 + SrCl2 homogenized powdery batches. Cooling curves feature exotherms indicating the formation of

Abstract A problem of identification of parameters of the Mie–Lennard-Jones and Morse pairwise interatomic potentials from the interaction of a single metal atom with perfect one-layer graphene has been considered for the first time. Numerical calculations have been performed for different heteroatomic pairs. The potential parameters were calculated from the equilibrium adsorption energy and distances

Abstract The effect of an organic fuel on the combustion mode, features of combustion, and the phase composition of the end product of the synthesis of yttrium orthoferrite was studied. It was shown that the production of YFeO3 requires a fuel that favors the formation of a single polymer metal-containing complex determining the gel structure and ensures the combustion in an intense self-sustaining

Abstract A complex approach to the short-range ordering in molten binary cadmium and zinc antimonides has been proposed which considers specific features of the fine structure of chemical bond and interatomic interaction in АIIВV semiconductors. A procedure has been developed and the dissociation energies of nonequivalent chemical bonds in cadmium and zinc antimonides have been calculated as a function

Abstract The formation of a hierarchical cobalt(II, III) oxide coating on the surface of a polycrystalline Al2O3 substrate under hydrothermal conditions was studied. Features of the microstructure of the obtained coatings were investigated by scanning electron microscopy; these coatings were shown to consist of Co3O4 nanosheets arranged perpendicular to the surface of the substrate with a blossoming

Abstract Zinc sulfide ZnS nanopowders were prepared by chemical deposition from aqueous solutions of zinc nitrate and sodium sulfide in the presence of sodium citrate or Trilon B. ZnS/Ag2S heteronanostructures were prepared by two-step chemical codeposition of zinc and silver sulfides. The prepared ZnS nanopowders had average particle sizes ranging from 2 to 10 nm depending on the reagent concentration

Abstract We studied by physicochemical modeling (PCM) how the temperature and redox properties of the crystallization atmosphere affect the equilibrium compositions of product phases using trachyandesibasalt as an example. The chemical composition of rock-forming minerals and their influence on the properties of rocks are presented. The heating, melting, and crystallization features of trachyandesibasalt

Abstract Phase equilibria in the NH4H2PO4–(NH4)2HPO4–(NH4)2SO4–NH4Cl–H2O five-component water–salt system and in its boundary systems have been studied at 25°С by an optimized sections method. The efficiency of the algorithm for predicting the compositions of eutonic solutions in the system has been shown. The methodology of experimental design and its implementation in studies of in-, mono-, di-,

Abstract The HfB2–30 vol % SiC composite powders modified with a small (2 and 5 vol %) amount of Y3Al5O12 were synthesized by the sol–gel method. Such a modification in producing an ultra-high-temperature ceramic of the corresponding composition optimized the process temperature and increased the oxidation resistance of the ceramic by stabilizing the formed hafnium dioxide in the cubic or tetragonal

Abstract A hierarchical nickel oxide film was grown on the surface of a polycrystalline Al2O3 substrate by hydrothermal synthesis. The microstructure of the obtained coating was studied by scanning electron microscopy and atomic force microscopy, which showed that this coating comprises porous nanosheets (about 7 nm thick) arranged at various angles to each other and to the surface of the substrate

Abstract— Magnesium oxide (MgO) and orthophosphoric acid (H3PO4) have been reacted at different pH values to study the effects of alkalinity on the characteristic features of magnesium phosphate material. The phases of the synthesized samples have been identified as newberyite (with the chemical formula of MgHPO4 ⋅ 3H2O and the pdf no. 01-075-1714) and magnesium phosphate hydrate (with the chemical

Abstract The copper(I) complexation reaction with 2,2'-bipyridyl in the presence of salts of the closo-deca-borate anion has been studied in air in organic solvents (1,2-dichloroethane and DMF). It has been found that, as a result of the redox reaction, copper(II) coordination compounds with the [B10H10]2– anion and 2,2'-bipy-ridyl anion are prepared from known copper(I) complex [\({\text{Cu}}_{2}

Abstract Characteristic features of the sorption interaction of magnesium(II) ions in aqueous solutions with hydroxyapatite nanoparticles used as the sorbent were elucidated. The process kinetics was found to be adequately described by a pseudo-second order model. The sorption isotherm reflects consecutive changes in the mechanisms of sorbate and sorbent interaction with increasing sorbent concentration

Abstract The activity coefficients in aqueous solutions of lithium and sodium sulfates at 298 K were calculated by the generalized Debye–Hückel theory using the experimental values of the static permittivity of the solutions. The effect of the hydration and ion association on the dielectric and thermodynamic properties of the electrolyte solutions was considered.

Abstract The results of determination of phase equilibria and construction of total phase equilibria diagram for the quinary Li, Na, K, Sr//Cl–H2O system at 25°C by means of translation method have been discussed. Two points saturated with four solid phases, seven curves saturated with three solid phases, and nine fields saturated with two different solid phases have been determined on the quinary

Abstract The new complexes [M(NKA)2(NCS)2(H2O)2], where M2+ = Co2+ (I), Ni2+ (II); NKA = C10H14N2O (N,N-diethylpyridine-3-carboxamide, nicotinic acid diethylamide, nikethamide), have been synthesized and studied by chemical and X-ray diffraction analyses and IR spectroscopy. The single-crystal X-ray diffraction analysis of these complexes has shown that they crystallize in triclinic system with space

Abstract The potential energy surface (PES) of the elementary catalytic cycle of hydrogenation of magnesium clusters doped with transition metals (L = Ti, V, Cr, Mn, Fe, Co), Mg17L + H2, has been calculated by the density functional theory method. Stationary points of the PES corresponding to local minima of intermediates and transition states along the minimum energy reaction path have been determined

Abstract A method for the surface chemical modification of aluminum oxyhydroxide (boehmite γ-AlO (OH)) by the nitrilotris(methylene phosphonic) acid (NTP) complexing ligand is proposed. The unmodified and NTP-modified boehmites are characterized using X-ray powder diffraction, XPS, and IR spectroscopy; the acid–base and complex-forming properties of surface-grafted NTP are studied. One of the three

Abstract Semiconductor–ferromagnet alloys in the CdAs2–MnAs system were synthesized in evacuated ampules. Differential thermal analysis (DTA), X-ray powder diffraction analysis, differential scanning calorimetry, and scanning electron microscopy showed that this system is eutectic (of the acicular type), and the coordinates of the eutectic are (6 ± 0.5 mol % MnAs, Tmelt = 614 ± 1°C). The liquidus lines

Abstract Magnetic fields generated by nanosolenoids based on gold nanotubes have been calculated. The electron energy levels in nanotubes have been calculated by the linearized augmented cylindrical wave method with cyclic Born–Von Kármán boundary conditions and with taking into account helical symmetry of the tubes. The numbers of conducting channels, low-temperature ballistic electron currents, and

Abstract Interaction between the systems containing cobalt(II) or nickel(II) chlorides and 2-thiobarbituric acid (C4H4N2O2S, H2L) was examined by spectrophotometry and pH-metry at pH < 4, I = 0.1 (NaCl) and T = 20°C. The compositions and the overall stability constants (log β11) of protonated complex species were determined: [CoHL]+ (3.69 ± 0.04), [NiHL]+ (3.68 ± 0.08), and [M(HL)2]. The compositions

Abstract A comparative analysis has been made for the dielectric and electrorheological properties of suspensions of highly dispersed powders of bismuth ferrites BiFeO3 and Bi2Fe4O9 in polydimethylsiloxane PMS-300. Dielectric characteristics (dielectric constant, dielectric loss tangent) for the suspensions in frequency range 2.5–106 Hz have been determined and non-Debye character of relaxation processes

Abstract The paper describes the results of a physicochemical study of materials obtained in the K2O–MO(M2O3)–TiO2 systems (M = Ni, Mg, Al, Fe, Cr) by pyrolysis of citrate–nitrate compositions and by co-precipitation followed by hydrothermal treatment. It was shown that the nanoparticles formed in the hydrothermal process have a high sorption capacity towards the model dye (methylene blue), but do

Abstract Two ruthenium complexes containing nitro-substituted ligand, [Ru(bpy)2(hnpip)](PF6)2 (1) and [Ru(phen)2(hnpip)](PF6)2 (2) (bpy = 2,2'-bipyridine; phen = 1,10-phenanthroline; hnpip = 2-(3-hydroxyl- 4-nitrophenyl)imidazo[4,5-f][1,10-phenanthroline] were synthesized and characterized. DNA binding behaviors were studied by luminescent titration, UV-vis titration, FRET (FRET = Fluorescence resonance

Abstract The possibility of the formation of a La1 – 2xBixSrxMn1 – yNiyO3 + δ solid solution (x = 0.15, 0.25, y = 0.0–0.4) and the effect produced by the method of synthesis on its characteristics have been studied. Single-phase compounds with a rhombohedral structure have been obtained at y ≤ 0.2. A further increase in Ni2+ content leads to the formation of some additional phases, namely, NiO, Bi7

Abstract The europium complex 1 ([Eu2Na3(bsalen)2(L)2(CH3O)(NO3)2] ⋅ 3H2O) with unusual trigonal bipyramid-shaped core [Na3Eu2] has been formed via the reaction of Eu(NO3)3 with N,N'-bis(3-methoxy-salicylidene)-ethylenediamine (bsalen2– ligand), 2-hydroxy-4-methoxybenzophenone (HL) and NaOH in the ratio of 1 : 1 : 1 : 3.5 in methanol. Crystal structure reveals that each Eu(III) ion is encapsulated

Abstract The magnetic and sorption properties of CoFe2O4 and SiO2 nanocomposites were studied. Composite samples were prepared by precipitation and impregnation using silica of plant or mineral origin. X-ray powder diffraction and IR spectroscopy showed that the composites comprise both amorphous SiO2 and 5.3–59.2% CoFe2O4. The sorptive capacity for methylene blue (8.8–26.7 mg/g) was higher than that

Abstract Nickel(II) salts with unsaturated monocarboxylic acids (acrylic, methacrylic, sorbic, 4-pentynoic, propiolic, crotonic, linoleic, and oleic acids) have been synthesized. The compounds have been studied by thermogravimetry, differential scanning calorimetry, elemental analysis, and IR spectroscopy. Controlled thermolysis of the obtained carboxylates afforded nickel-containing nanocomposites

Abstract A method to synthesize spinel (MgAl2O4)–based compounds doped with magnesium ions was developed, which makes it possible to create red-emitting phosphors (band peak at 651 nm) or green-emitting phosphors (band peak at 525 nm) due to the luminescence of Mn4+ or Mn2+, respectively, and also phosphors that have both (red and green) emission bands. Both types of luminescence exhibit quite high

Abstract Interphase distribution of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y between aqueous HNO3 solutions and solutions of binary extractants obtained by reaction of equimolar amounts of dialkylamino derivatives of carbamoylmethylphosphine oxides and dinonylnaphthalenesulfonic acid in organic solvents has been studied. Stoichiometry of extracted complexes has been determined

Abstract Thorium dioxide represents a future of the world market of nuclear fuel for fourth generation nuclear reactors. In this regard, the problems of technologies for thorium separation from irradiated fuel, its conversion into fuel raw materials, and fabrication of required quality fuel products need effective solutions. In this work the synthesis of microcrystalline mesoporous ThO2 powders through

Abstract Fe3O4 magnetic nanoparticles have been synthesized successfully in chemical co-precipitation method and coated with oleic and citric acids, separately. The crystalline sizes are determined by the Debye-Scherer equation with X-ray powder diffraction data. As a result, the mean crystalline size and lattice constant of Fe3O4 nanoparticles respectively increases from ~11 to ~13.8 nm and ~8.352

Abstract— Au nanoparticles (NPs) prepared under different molar ratio (concentration) of polyoxometalate Na10SiW9O34 ⋅ 18H2O (SiW9) at definite concentrations of AuIII (0.15 mM), NaOH (1.5 mM), and ascorbic acid (0.225 mM) have been investigated systematically and quantitatively. The size of Au NPs decreases from 81.5 nm to 30.0 nm when the molar ratio of SiW9 increases from 1 to 22, which is related

AbstractThe catalytic activity of cobalt(II) porphyrinate in the oxidative degradation of β-carotene and lycopene by hydrogen peroxide is studied using spectroscopic methods. The kinetic parameters of the redox process are obtained, and its tentative mechanism is proposed. The catalytic activity is shown to depend on the composition of the coordination site and the presence of additional redox activators

AbstractThe origin of cation-induced (K+ and \({\text{NH}}_{4}^{ + }\)) differences in the character of ordering of critical ions (H/D) responsible for the ferroelectric activity of H-bonded ferroelectrics and related materials has been explained in the framework of the approach to the description of their properties implying independent quantum-chemical determination of all required pseudospin Hamiltonian

AbstractComplexation between silver(I) ions and N-phenylthiourea is studied over a wide range of silver(I) and N-phenylthiourea (L) concentrations at 25.0°C and ionic strength I = 0.11 M (0.01 M HNO3 + 0.1 M NaNO3) by potentiometric titration using a silver electrode. Mono- and binuclear complexes are present in the studied concentration range of Ag+ ions (1 × 10–5–1 × 10–3 mol/L). \({\text{A}}{{{

Abstract—ZnO nanoparticles with different sizes were prepared by varying molar ratio of tartaric acid and zinc nitrate hexahydrate as fuel and oxidizer (F/O) at 0.00, 0.25, 0.50, and 1.00 (0.0000, 0.0025, 0.0050, and 0.0100 mol tartaric acid) by tartaric acid solution combustion method and followed by calcination at 600°C for 2 h. Effect of molar ratio of F/O on phase, morphology and photocatalytic

Abstract—Sn doped ZnO (SZO) nanorods with oxygen-vacancy have been synthesized by one-step hydrothermal method. Detailed analysis based on X-ray photoelectron spectroscopy (XPS), transmission electron microscope (HRTEM), and electron paramagnetic resonance (EPR) has revealed that Sn doped ZnO nanorods are rich in oxygen-vacancies. Oxygen-vacancies lead to the band-gap narrowing of Sn doped ZnO nanorods

AbstractData on the extraction of lithium salts and the distribution of extractant in the LiX–H2O- benzo-15-crown-5–CHCl3 systems, where X– is Br–, \({\text{ClO}}_{4}^{ - },\) and SCN–, have been first obtained in wide ranges of salt and extractant concentrations. The solubility of benzo-15-crown-5-ether in water in the temperature range 25–60°C and the isotherm of the distribution of crown ether between

AbstractThe ternary systems with a common cation, NaCl–NaI–Na2WO4 and KCl–KI–K2WO4, were studied by differential thermal analysis. The composition point of the congruently melting compound NaCl ⋅ Na2WO4 formed in the NaCl–Na2WO4 system divides the NaI–NaCl–Na2WO4 system into two triangles, in each of which there is a ternary eutectic. The characteristics of invariant points were determined, and phase

AbstractA protectant for hypothermic preservation of human sperm based on glass-forming water–salt systems of vital metals (magnesium, zinc, and calcium) was developed for the first time. The method of sperm preservation without preliminary washing of seminal plasma is proposed, which retains the sperm viability and sperm motility parameters comparable to the values of native sperm. The proposed protectant

AbstractComposites have been manufactured based on a mixture of calcium phosphates and an alginate-chitosan polyelectrolyte complex (PEC). The properties of these composites can be tuned by varying the filler/matrix ratio and drying temperature, so these materials may be regarded as potentially usable in orthopedics and traumatology. The composition and morphology of the manufactured samples and their

AbstractIn spite of the wide application of nanodisperse tungsten oxide (from photo- and electrochromic devices to biomedical materials), its physicochemical properties were studied insufficiently. In this work, we have performed a comparative analysis of photochromic and photocatalytic properties of polyvinylpyrrolidone-stabilized tungsten oxide nanoparticles prepared by ion exchange and precipitation

AbstractThe phase complex of the quinary reciprocal system Li+,Na+,K+||F–,Cl–,Br– was studied for the first time. Partition according to graph theory determined that the tree of phases of the system has linear structure and comprises stable polytopes: the pentatope LiF–NaF–KF–KBr–KCl, the hexatope LiF–NaBr–NaCl–KCl–KBr–NaF, and the heptatope NaCl–KCl–KBr–LiBr–LiCl–LiF–NaBr, connected by the stable

AbstractThe solubilities of salts in the MgSO4–H2O and CdSO4–H2O systems are studied at 276–500°C using various methods (visual examination of phase transformations in water–salt mixtures in sealed quartz ampoules, collecting solution samples and performing chemical analysis, and measuring p–V–T dependences in an autoclave) to determine temperature dependence and classify the compounds as one the of

AbstractSamples in the Li2O–B2O3–Yb2O3 system were synthesized and studied by differential thermal analysis, X-ray powder diffraction analysis, and thermodynamic analysis. Polythermal sections and an isothermal section of the phase diagram of this system were constructed. It was shown that the polythermal sections Li2O ⋅ 3B2O3–Yb2O3 ⋅ B2O3 and Li2O ⋅ B2O3–Yb2O3 ⋅ B2O3 are non-quasi-binary, and Li2O

AbstractA method for the synthesis of mono- and bimetallic zirconium and/or hafnium oxides by supercritical antisolvent precipitation has been developed. The oxides have been obtained using a laboratory dispersing system, alkoxides (zirconium propoxide, hafnium butoxide) and zirconium acetylacetonate have been used as precursors. A white powder of amorphous phase with composition MO2 · mH2O · nCxHyOz

Abstract—Nanoparticles of spinel ferrites with composition MFe2O4 (M = Zn, Ni) have been effectively synthesized by hydrothermal and sol-gel routes, in which Triton-X 100 is used as a surfactant. The structure of ferrite nanoparticles has been characterized by X-ray diffraction, which has showed single cubic spinel phases for all the samples. The surface morphology and elemental composition have been

AbstractCalculations of high-spin isomers of MO4V20\({\text{O}}_{{46}}^{{n-}}\) anions (S = 9) with MO4 tetraoxo anions located in the inner and outer spheres of the mixed-valence V20O46 cage have been performed by the density functional theory method. It has been shown that for all systems the endohedral isomers are considerably more favorable than the exohedral isomers. For the complexes with transition

AbstractThe molecular structures of (6666) macrotetracyclic (M(IV) chelates (M = Ti, V, Cr, Mn, Fe, Co, Ni, Cu) with the (NNNN)-donor ligand porphyrazine and the oxo ligand have been calculated by the DFT OPBE/TZVP method. Selected bond lengths and bond and nonbonded angles in the complexes have been reported. The standard enthalpies, entropies, and Gibbs energies of formation of these compounds have

AbstractTris(4-fluorophenyl)antimony dicarboxylates (4-FC6H4)3Sb[OC(O)R]2, where R = CH2Cl (I), C6F5 (II), C6F4H-2 (III), CF2CF3 (IV), CF2CF2CF3 (V), and (3-FC6H4)3Sb[OC(O)C6F4H-2]2 (VI) have been synthesized by the reaction of tris(fluorophenyl)antimony with chloroacetic, pentafluorobenzoic, tetrafluorobenzoic, pentafluoropropionic, and heptafluorobutyric acids in the presence of tert-butyl hydroperoxide

AbstractFormation conditions were studied for compounds of hydrated vanadium oxide \({{\left( {{\text{N}}{{{\text{H}}}_{{\text{4}}}}} \right)}_{x}}{\text{V}}_{y}^{{{\text{4}} + }}{\text{V}}_{{{\text{2}} - y}}^{{{\text{5}} + }}{{{\text{O}}}_{{\text{5}}}} \cdot n{{{\text{H}}}_{{\text{2}}}}{\text{O}}\) (0.24 ≤ х ≤ 0.36, 0.24 ≤ y ≤ 0.36) prepared by hydrolytic deposition with vanadyl sulfate used as the

AbstractGold and silver complexes with cyanide, thiocyanate, and thiosulfate ions have been considered. The potential energy surfaces of sorption complexes are shown. Quantum-chemical calculations of gold and silver complexes have been performed by the PM6 semi-empirical method as part of MOPAC. For eleven gold compounds, sets of potential energies have been obtained for various combinations. The potential