Abstract— TiC + xC composites comprising titanium carbide particles, unreacted carbon black particles, and a graphite nanofilm have been prepared by self-propagating high-temperature synthesis pressing. The fused titanium carbide particles form a robust skeleton, whose voids contain carbon black particles separated from the titanium carbide particles by the graphite nanofilm. We have examined the effect

Abstract— We have studied the effect of doping with Sn (0.004 and 0.008 at %) on the properties of Bridgman-grown single crystals of an n-type Bi2Te1.5Se1.5 solid solution. Thermoelectric power, electrical conductivity, thermal conductivity, and Hall effect measurements in the range 77–400 K have shown that Sn influences the electrical transport properties of the solid solution. Single crystals with

Abstract— The β \( \rightleftarrows \) α phase transformations in foil of the Pd–52 at % Cu solid solution prepared by rolling have been studied using X-ray diffractometry and resistivity measurements during thermal heating–cooling cycles or lamp processing (LP) using light from high-power pulsed xenon lamps, followed by cooling. The results demonstrate that complete ordering of the two-phase (α +

Abstract— The composition and structure of a new compound, Ni3.35W9.65C4, have been determined by comparing X-ray powder diffraction, crystal-chemical modeling, and density functional quantum-chemical calculation (VASP program) results. The compound, in cast form, has been prepared by a self-propagating high-temperature synthesis metallurgy method via combustion of an exothermic WO3 + NiO + Ca + Al

Abstract— This paper describes a joint correlation analysis of the heat capacity Cp(T) and volume thermal expansivity β(T) of potassium chloride (KCl) over the entire temperature range of its solid state (from absolute zero to Tm). A trilinear model for the β(Cp) correlation dependence, consistent with experimental data and consisting of three smoothly joined linear segments, has been constructed.

Abstract— Composites based on LiFePO4/C and poly(3,4-ethylenedioxythiophene) (LiFePO4/C/PEDOT) have been prepared via in situ oxidative EDOT polymerization or mechanical mixing of LiFePO4/C with presynthesized PEDOT particles, including those prepared in the presence of different surfactants (Triton X-100 and cetyltrimethylammonium bromide). The resultant materials have been characterized by X-ray

Abstract— The structure and typical behavior of boron–oxygen groups in Li2O–B2O3 melts and glasses have been studied by high-temperature Raman spectroscopy. Under conditions similar to those of lithium triborate crystal growth, we have detected the formation of BO2 monomers, which influence the growth process. The results have been compared to those for structural groups of pure boron oxide.

Abstract— We have optimized conditions for the flux growth of the RAl3(BO3)4 (R = Y, Nd, Gd, Lu) and RMgB5O10 (R = Y, La, Gd) rare-earth borates and measured the thermal conductivity of YAl3(BO3)4, NdAl3(BO3)4, GdAl3(BO3)4, LuAl3(BO3)4, and LaMgB5O10 crystals. The results strongly suggest that these materials are potentially attractive for use as laser gain elements.

Abstract— The Bi12TiO20, Bi4Ti3O12, and Bi2Ti4O11 bismuth titanates have been prepared by solid-state reactions, via multistep firing of stoichiometric mixtures of their constituent oxides in air at temperatures from 1003 to 1273 K (Bi12TiO20, to 1123 K). The heat capacity of polycrystalline samples of the synthesized compounds has been determined by differential scanning calorimetry in the temperature

Abstract— A LiNbO3:Zn (4.69 mol % ZnO) crystal grown from a charge synthesized using homogeneously doped Nb2O5 as a precursor has been shown to contain less luminescence centers in comparison with a LiNbO3:Zn (4.60 mol % ZnO) crystal prepared via direct doping. In the case of LiNbO3:Zn crystals prepared via direct doping, the intensity of all luminescence bands varies monotonically as the ZnO concentration

Abstract— Colloidal Cd1 –x(Ca,Sr)xS and Cd1 –xCaxS:Eu3+ (0 < x < 0.20) quantum dots (QDs) have been synthesized by an emerging reagent method in a methylmethacrylate (MMA) medium. The mole fraction of Eu3+ in the starting reaction mixtures was varied from 0 to 0.80 relative to the Ca2+ concentration. Using radical block polymerization of MMA, we have obtained transparent luminescent polymethylmethacrylate

Abstract— The heat capacity Cp(T) of cadmium fluoride, strontium fluoride, and the Cd0.5Sr0.5F2 solid solution has been studied experimentally (2–300 K). We have detected deviations ΔCp(T) of the Cp(T) data from additivity. The low-temperature (2–50 K), positive deviations ΔCp(T) have been tentatively attributed to the effect of two-level systems associated with the glasslike character of the low-temperature

Abstract— It has been shown that two competing processes occur in a system of water glass (WG) silicates and [BnXn]2– (n = 10, 12; X = H, Cl) boron cluster anions (WG/[An]) in the range 100–200°C: the formation of a supramolecular structure due to cation–anion contacts of the silanol groups of the silicate with [An]'s at t ≤ 100°C and the condensation of the silanol groups of the silicate, resulting

Abstract— The use of magnetic fields in nonaqueous spent nuclear fuel treatment processes involving molten salts opens up new possibilities for selective extraction of radionuclides. In this research, this approach has been applied to the selective extraction of rare-earth elements and zirconium. We have studied strontium hexaferrite and a spinel ferrite as a magnetic carrier, examined the feasibility

Abstract— A modification to a previously proposed glass transition criterion is analyzed and substantiated in terms of the delocalized atom model. The atom delocalization energy in sodium germanate, alkali silicate, and sodium borate glasses is shown to be a linear function of their glass transition temperature.

Abstract— We have studied the preparation of titanium trichloride solutions by reducing aqueous titanium tetrachloride solutions with metallic aluminum. The results demonstrate that aqueous titanium tetrachloride solutions have higher reactivity with metallic aluminum than does pure titanium tetrachloride. The highest stability is offered by solutions prepared from aqueous 25 to 40% titanium tetrachloride

Abstract— Indium tin oxide (ITO) films grown on silicate glass substrates have been characterized by X-ray photoelectron spectroscopy (XPS). Valence band and core level XPS spectra have been used for qualitative and quantitative elemental analysis of the films before and after Ar+ ion etching to a depth of ~50 nm. It has been found that the densest (best quality) oxide layer was produced on the surface

Abstract— We have studied the effect of polymerization-induced phase separation (PIPS) step conditions in a resol phenol-formaldehyde resin–ethylene glycol system on the physicochemical properties of carbon samples obtained after post-curing and pyrolysis. The results demonstrate that raising the PIPS step temperature leads to a decrease in macropore size and increase in the total mesopore volume.

Abstract— It has been shown that mechanical activation of a boehmite + lithium carbonate mixture with an Al : Li atomic ratio of 5 : 1 in an AGO-2 planetary activator at a centrifugal acceleration of 40g and milling times from 1 to 10 min and subsequent heat treatment of the mechanically activated mixture for 2 h at 900°C ensure the formation of fine-particle phase-pure lithium pentaaluminate with

Abstract— This paper presents a comparative analysis of the influence of acid and alkaline synthesis media on specific structural features of materials and their sorption characteristics during heat treatment of a precursor to calcium titanate. The liquid-phase synthesis medium is shown to influence the photocatalytic activity of CaTiO3 and its precursor.

Abstract— Ln2O3 + HfO2 (Ln = Nd, Dy) powders and ceramics have been studied in an oxidizing (O2) and a mild reducing (He) atmosphere using differential scanning calorimetry (DSC), thermogravimetry, mass spectrometric analysis of released gases, X-ray diffraction, IR spectroscopy, and Raman spectroscopy. The results demonstrate that both a mechanically activated oxide mixture of appropriate composition

Abstract— We have studied a high-purity manganese sample provided by the Exhibition–Collection of Extrapure Substances, operating on the basis of the Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, and analyzed for the concentration and trace levels of 59 elemental impurities. The content of the major component in it was 99.9993 wt %. Its growth surface was

Abstract— Carbonate-containing hydroxyapatite has been synthesized from prototype human synovial fluid in the presence of proline. The resultant powders have been shown to contain 61 to 71 wt % the amino acid. The presence of proline in the model solution has been shown to change the crystallinity and specific surface area of the samples, without influencing the composition or crystallite size of the

Abstract— We report our findings on the influence of composition and reaction temperature on the phase composition and structure of nickel-based microspheres prepared by combining exothermic synthesis and spray pyrolysis from a glycine–nitrate solution. It has been shown that, at the optimal reductant-to-oxidant ratio and reaction temperature, the microspheres consist of Ni, Ni3N, and NiO, and the

Abstract— It has been demonstrated that titanyl hydrogen phosphate-based sorption materials can be effectively used for the extraction of cesium and strontium radionuclides from liquid radioactive waste similar in chemical composition to seawater. We have optimized conditions (pH, liquid : solid ratio, and temperature) for the coextraction of cesium and strontium cations. The titanium(IV) cesium or

Abstract— We have studied the effect of ZrC and ZrO2 additions on the microstructure and properties of ceramic composites based on ZrB2–5% SiC, produced by pressure-sintering mechanically activated powders at a temperature of 1600°C. The results demonstrate that the addition of ZrO2 increases the density, hardness, and fracture toughness of ceramic composites based on ZrB2–5% SiC. In particular, the

Abstract— The surface morphology and composition of a NbC/C composite prepared via thermal decomposition of the products of reaction between NbCl5 and acetylene [9] have been studied by scanning electron microscopy and X-ray photoelectron spectroscopy. The results demonstrate that the NbC thus synthesized consists of nanocrystals. The surface layer of the NbC/C composite contains nine carbon atoms

Abstract— Iron and cobalt hexacyanoferrates and their analogs (MHCF) have been synthesized as nanomaterials for the fabrication of C/MHCF composite electrodes. We have studied the structural characteristics and elemental composition of the synthesized compounds by X-ray diffraction and energy dispersive X-ray microanalysis using a VEGA II LMU scanning electron microscope equipped with an INCA Energy

Abstract— The low-temperature (80–190 K) thermoelectric power of TlCrS2 has been shown to follow the relation α(T) = (0.2T – 13) μV/K, characteristic of charge transport through localized states in the band gap. As the temperature is raised from 338 to 370 K, where the electrical conductivity is dominated by charge carriers excited to the allowed band, the thermoelectric power varies of TlCrS2 is inversely

Abstract— Reaction-bonded silicon carbide materials have been produced by infiltrating molten silicon into porous bodies consisting of silicon carbide, carbon black, and tungsten-core silicon carbide fibers. Their microstructure and mechanical properties have been studied as functions of reinforcing fiber content. Their bending strength, hardness, and modulus of elasticity have been shown to drop with

Abstract— This paper presents modified views on the vapor–liquid–solid mechanism of nanowire growth, relying on new experimental data on the wettability of a crystal surface by metal catalyst droplets presaturated with the crystallizing substance.

Abstract M0.5(1 +x)FexZr2 –x(PO4)3 (M = Ni, Cu, Mn; 0 ≤ x ≤ 0.5) phosphates have been studied as catalysts for methanol conversion in the temperature range 200–450°C. The results demonstrate that the most active and selective catalysts among these materials are Ni0.5Zr2(PO4)3 and Cu0.65Fe0.3Zr1.7(PO4)3. The dimethyl ether yield on the synthesized materials is comparable to that on available commercial

Abstract— We have studied the structure and electrical properties of thin films based on the In2O3 semiconductor and carbon, grown by atomic layer deposition using ion-beam sputtering. The structure of the resultant materials, formed during layer-by-layer growth of island layers, is made up of nanocrystalline In2O3 granules distributed at random over amorphous carbon. The electrical transport properties

Abstract— In this paper, we discuss general aspects of the impurity composition of high-purity glass samples in the Permanent Exhibition–Collection of Extrapure Substances. We estimate the average and total concentrations of elemental impurities in the purest samples and assess the contributions of individual impurity classes to the total impurity concentration, which makes it possible to more accurately