Subjects -> CHEMISTRY (Total: 928 journals)
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    - CHEMISTRY (661 journals)
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CHEMISTRY (661 journals)            First | 1 2 3 4 | Last

Showing 401 - 600 of 735 Journals sorted alphabetically
Journal of Molecular Liquids     Hybrid Journal   (Followers: 3)
Journal of Molecular Modeling     Hybrid Journal   (Followers: 5)
Journal of Molecular Recognition     Hybrid Journal   (Followers: 2)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Molecular Structure     Hybrid Journal   (Followers: 6)
Journal of Nanoparticles     Open Access   (Followers: 4)
Journal of Nanostructure in Chemistry     Open Access   (Followers: 8)
Journal of Organometallic Chemistry     Hybrid Journal   (Followers: 25)
Journal of Photochemistry and Photobiology     Open Access  
Journal of Photochemistry and Photobiology A: Chemistry     Hybrid Journal   (Followers: 3)
Journal of Photochemistry and Photobiology B: Biology     Hybrid Journal   (Followers: 4)
Journal of Photochemistry and Photobiology C: Photochemistry Reviews     Full-text available via subscription   (Followers: 3)
Journal of Polymer & Composites     Full-text available via subscription   (Followers: 17)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 7)
Journal of Polymer Science Part A: Polymer Chemistry     Hybrid Journal   (Followers: 92)
Journal of Polymers     Open Access   (Followers: 7)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Progressive Research in Chemistry     Open Access  
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 3)
Journal of Raman Spectroscopy     Hybrid Journal   (Followers: 14)
Journal of Research and Education Chemistry     Open Access   (Followers: 1)
Journal of Research Updates in Polymer Science     Hybrid Journal   (Followers: 2)
Journal of Rubber Research     Hybrid Journal   (Followers: 1)
Journal of Saudi Chemical Society     Open Access  
Journal of Solid State Chemistry     Hybrid Journal   (Followers: 13)
Journal of Solution Chemistry     Hybrid Journal   (Followers: 1)
Journal of Structural Chemistry     Hybrid Journal   (Followers: 1)
Journal of Sulfur Chemistry     Hybrid Journal   (Followers: 1)
Journal of Supercritical Fluids     Hybrid Journal   (Followers: 3)
Journal of Superhard Materials     Hybrid Journal  
Journal of Surface Science and Technology     Hybrid Journal  
Journal of Surfactants and Detergents     Hybrid Journal   (Followers: 3)
Journal of Taibah University for Science     Open Access  
Journal of the American Chemical Society     Hybrid Journal   (Followers: 321)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 32)
Journal of the American Society of Brewing Chemists     Full-text available via subscription   (Followers: 2)
Journal of the Chilean Chemical Society     Open Access   (Followers: 2)
Journal of the Chinese Chemical Society     Hybrid Journal  
Journal of the Indian Chemical Society     Hybrid Journal  
Journal of The Indonesian Society of Integrated Chemistry     Open Access  
Journal of the Iranian Chemical Society     Hybrid Journal   (Followers: 1)
Journal of the Korean Society for Applied Biological Chemistry     Hybrid Journal  
Journal of the Mexican Chemical Society     Open Access   (Followers: 1)
Journal of the Serbian Chemical Society     Open Access  
Journal of the Turkish Chemical Society, Section A : Chemistry     Open Access  
Journal of Theoretical and Computational Chemistry     Hybrid Journal   (Followers: 9)
Jurnal Inovasi Pendidikan Kimia     Open Access  
Jurnal Kimia (Journal of Chemistry)     Open Access  
Jurnal Kimia Riset     Open Access  
Jurnal Pendidikan Kimia     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kinetics and Catalysis     Hybrid Journal   (Followers: 4)
Konfigurasi : Jurnal Pendidikan Kimia dan Terapan     Open Access  
Korea-Australia Rheology Journal     Hybrid Journal   (Followers: 1)
Langmuir     Hybrid Journal   (Followers: 58)
Lebensmittelchemie     Hybrid Journal   (Followers: 1)
Lipid Insights     Open Access  
Luminescence     Hybrid Journal   (Followers: 2)
Macromolecular Materials & Engineering     Hybrid Journal   (Followers: 5)
Macromolecular Rapid Communications     Hybrid Journal   (Followers: 10)
Macromolecular Research     Hybrid Journal   (Followers: 2)
Macromolecular Symposia     Hybrid Journal   (Followers: 3)
Macromolecular Theory and Simulations     Hybrid Journal   (Followers: 2)
Macromolecules     Hybrid Journal   (Followers: 48)
Magnetic Resonance in Chemistry     Hybrid Journal   (Followers: 8)
Magnetochemistry     Open Access  
Marine Chemistry     Hybrid Journal   (Followers: 6)
Marine Drugs     Open Access   (Followers: 1)
MATEC Web of Conferences     Open Access  
Materials Advances     Open Access   (Followers: 2)
Materials and Devices     Open Access  
Materials Characterization     Hybrid Journal   (Followers: 32)
Materials Chemistry Frontiers     Hybrid Journal   (Followers: 4)
Materials Horizons     Hybrid Journal   (Followers: 6)
Materials Research Bulletin     Hybrid Journal   (Followers: 25)
Materials Science-Poland     Open Access   (Followers: 1)
Materials Sciences and Applications     Open Access   (Followers: 2)
Medicinal Chemistry Research     Hybrid Journal   (Followers: 9)
Mediterranean Journal of Chemistry     Open Access  
Metallography, Microstructure, and Analysis     Hybrid Journal   (Followers: 1)
Micro and Nano Systems Letters     Open Access   (Followers: 6)
Microchimica Acta     Hybrid Journal   (Followers: 2)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 9)
Modern Chemistry & Applications     Open Access   (Followers: 1)
Modern Research in Catalysis     Open Access  
Molbank     Open Access  
Molecular Catalysis     Hybrid Journal   (Followers: 6)
Molecules     Open Access   (Followers: 4)
Molecules and Cells     Hybrid Journal   (Followers: 1)
Monatshefte für Chemie - Chemical Monthly     Hybrid Journal   (Followers: 4)
Mongolian Journal of Chemistry     Open Access  
Moscow University Chemistry Bulletin     Hybrid Journal   (Followers: 1)
MRS Bulletin     Full-text available via subscription   (Followers: 4)
Nachrichten aus der Chemie     Hybrid Journal   (Followers: 18)
Nano Convergence     Open Access   (Followers: 1)
Nano Materials Science     Open Access   (Followers: 1)
Nano Reviews & Experiments     Open Access   (Followers: 14)
Nano Select     Open Access  
Nanochemistry Research     Open Access   (Followers: 1)
Nanoscale     Hybrid Journal   (Followers: 18)
Nanoscale Advances     Open Access  
Nanoscale Horizons     Hybrid Journal  
Nanoscale Research Letters     Open Access   (Followers: 8)
Nanoscience and Nanotechnology Letters     Full-text available via subscription   (Followers: 24)
Natural Product Communications     Open Access  
Natural Product Reports     Hybrid Journal   (Followers: 10)
Natural Science     Open Access   (Followers: 8)
Natural Volatiles & Essential Oils     Open Access  
Nature Chemistry     Full-text available via subscription   (Followers: 97)
Nature Protocols     Full-text available via subscription   (Followers: 72)
Nature Reviews Chemistry     Hybrid Journal   (Followers: 17)
New Journal of Chemistry     Hybrid Journal   (Followers: 17)
Nitric Oxide     Hybrid Journal  
Nitrogen     Open Access  
Nukleonika     Open Access  
Open Chemistry Journal     Open Access  
Open Conference Proceedings Journal     Open Access  
Open Journal of Chemistry     Open Access  
Open Journal of Composite Materials     Open Access   (Followers: 21)
Open Journal of Inorganic Non-metallic Materials     Open Access   (Followers: 2)
Open Journal of Medicinal Chemistry     Open Access   (Followers: 4)
Open Journal of Polymer Chemistry     Open Access   (Followers: 12)
Open Journal of Synthesis Theory and Applications     Open Access  
Open Medicinal Chemistry Journal     Open Access  
Orbital - The Electronic Journal of Chemistry     Open Access   (Followers: 1)
Organic & Biomolecular Chemistry     Hybrid Journal   (Followers: 57)
Organometallics     Hybrid Journal   (Followers: 19)
Oxidation of Metals     Hybrid Journal   (Followers: 16)
Passer Journal of Basic and Applied Sciences     Open Access  
Peptide Science     Full-text available via subscription  
Pharmaceuticals     Open Access   (Followers: 4)
Pharmaceutics     Open Access   (Followers: 5)
Phosphorus, Sulfur, and Silicon and the Related Elements     Hybrid Journal   (Followers: 2)
Photochemistry and Photobiology     Hybrid Journal   (Followers: 3)
Physical Science International Journal     Open Access  
Physics and Materials Chemistry     Open Access   (Followers: 1)
Phytochemistry     Hybrid Journal   (Followers: 4)
Phytochemistry Letters     Full-text available via subscription   (Followers: 1)
Plasma     Open Access   (Followers: 3)
Plasma Chemistry and Plasma Processing     Hybrid Journal   (Followers: 3)
Polycyclic Aromatic Compounds     Hybrid Journal  
Polyhedron     Hybrid Journal   (Followers: 4)
Polymer Chemistry     Hybrid Journal   (Followers: 24)
Polymer crystallization     Hybrid Journal  
Polymer Degradation and Stability     Hybrid Journal   (Followers: 23)
Polymer Engineering & Science     Hybrid Journal   (Followers: 14)
Polymer Reviews     Hybrid Journal   (Followers: 32)
Polymer Science Series D     Hybrid Journal   (Followers: 3)
Polymer Testing     Hybrid Journal   (Followers: 192)
Polymer-Plastics Technology and Materials     Hybrid Journal   (Followers: 5)
Polymers     Open Access   (Followers: 21)
Polymers from Renewable Resources     Hybrid Journal  
Proceedings of the Combustion Institute     Full-text available via subscription   (Followers: 8)
Processes     Open Access  
Progress in Lipid Research     Hybrid Journal   (Followers: 3)
Progress in Organic Coatings     Hybrid Journal   (Followers: 7)
Progress in Polymer Science     Full-text available via subscription   (Followers: 36)
Progress in Reaction Kinetics and Mechanism     Open Access  
Progress in Solid State Chemistry     Full-text available via subscription   (Followers: 3)
Progress in Surface Science     Full-text available via subscription   (Followers: 3)
Protein Science     Hybrid Journal   (Followers: 45)
Radiochemistry     Hybrid Journal   (Followers: 1)
Rapid Communications in Mass Spectrometry     Hybrid Journal   (Followers: 33)
Reaction Chemistry & Engineering     Hybrid Journal  
Reaction Kinetics, Mechanisms and Catalysis     Hybrid Journal   (Followers: 3)
Reactions     Open Access  
Reportes Científicos de la FaCEN     Open Access  
Research Journal of Phytochemistry     Open Access   (Followers: 1)
Resources Chemicals and Materials     Full-text available via subscription   (Followers: 1)
Results in Chemistry     Open Access  
Results in Geochemistry     Open Access  
Results in Surfaces and Interfaces     Open Access  
Review Journal of Chemistry     Hybrid Journal   (Followers: 1)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 4)
Revista Boliviana de Química     Open Access  
Revista CENIC. Ciencias Quimicas     Open Access  
Revista Colombiana de Ciencias Químico-Farmacéuticas     Open Access  
Revista Colombiana de Química     Open Access  
Revista Cubana de Química     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciencias     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Sociedad Química del Perú     Open Access  
Revista de la Societat Catalana de Química     Open Access  
Revista de Química     Open Access   (Followers: 3)
Revista Debates em Ensino de Química     Open Access  
Revista ION     Open Access  
RSC Advances     Open Access   (Followers: 27)
RSC Chemical Biology     Open Access  
RSC Medicinal Chemistry     Hybrid Journal   (Followers: 6)
Russian Journal of Bioorganic Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of Coordination Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of General Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of Inorganic Chemistry     Hybrid Journal  
Sainstek : Jurnal Sains dan Teknologi     Open Access  
Science China Chemistry     Hybrid Journal   (Followers: 2)
Science Talks     Full-text available via subscription   (Followers: 2)
Sciences & Technologie A : sciences exactes     Open Access  
Scientific Journal of Frontier Chemical Development     Open Access   (Followers: 2)

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Russian Journal of Inorganic Chemistry
Journal Prestige (SJR): 0.325
Citation Impact (citeScore): 1
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1531-8613 - ISSN (Online) 0036-0236
Published by Springer-Verlag Homepage  [2469 journals]
  • Radio Brightness Contrasts of Aqueous Solutions of Alkali Metal Nitrates
           in the Millimeter Spectral Range

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      Abstract: Using a high-sensitivity radiometer at a frequency of 61.2 GHz (millimeter spectral range), the radio brightness characteristics of aqueous solutions of alkali metal nitrates (Li+, Na+, K+, Cs+) have been studied under laboratory conditions. Radio brightness effects of different sign have been observed for solutions with weakly hydrated (Cs+, K+) and more strongly hydrated (Li+, Na+) ions. The radio brightness parameters have been compared with calculated data from dielectric spectra in the millimeter range. It has been shown that the radiation of solutions is associated with dipole and ion hydration contributions to the dielectric loss, and the latter should be considered even in the millimeter range. For the studied systems, agreement between the experimental and calculated radio brightness parameters in the initial concentration range has been demonstrated.
      PubDate: 2022-04-01
       
  • The As2Te3–Сr2Тe3 System

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      Abstract: Chemical reactions between As2Te3 and Сr2Тe3 in the As2Te3–Сr2Тe3 system, which is a quasi-binary section of the As–Cr–Te ternary system, were studied by physicochemical methods (DTA, XRD, microstructure observations, microhardness measurements, and density determinations), and a relevant Т–х diagram was plotted. The As2Te3–Cr2Te3 system forms one chemical compound, namely, CrAsTe3, which melts incongruently at 375°C. Microstructural analysis showed that at room temperature, As2Te3-base solid solutions extend to 3.5 mol % Cr2Te3 and Cr2Te3-base solid solutions extend to 5 mol % As2Te3. The α phase (As2Te3-base solid solutions) and CrAsТe3 form a 15 mol % Cr2Тe3 eutectic at 335°С. X-ray diffraction showed that CrAsТe3 crystallizes in tetragonal crystal system with the unit cell parameters a = 14.246 Å, c = 5.993 Å, ρpycn = 6.57 g/cm3, ρx = 6.96 g/cm3.
      PubDate: 2022-04-01
       
  • Solubility Diagram of the Sodium Hypochlorite–Sodium
           Chloride–Water System

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      Abstract: Here we present the results of our solubility study of the sodium hypochlorite–sodium chloride–water system. The solubility diagram of the NаClО–NаCl–H2О system has been constructed at temperatures in the range from –38.0 to 65.4°С based on experimental data on the boundary binaries and eight inner sections. Of them, sections I–IV originate from the NаClО–H2O side toward the NаCl–H2О corner and sections V–VIII originate from the NаCl–H2О side toward the NаClО–H2O corner; the crystallization fields of ice, NаCl·2H2О, NаCl, NаClО·5H2О, NаClО·2.5H2О, and anhydrous NаClО crystals are demarcated in the diagram. The new compound NаClO3, as identified by X-ray powder diffraction and IR spectroscopy, is formed in the title system involving NаClО and NаCl aqueous solutions.
      PubDate: 2022-04-01
       
  • Thermal Decomposition of Co–Cu Double Salicylate Complex under Argon
           Atmosphere Resulting in Metal–Carbon Compositions

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      Abstract: Thermal decomposition of double complex (DC) [Co(NH3)6]Cl[Cu(C7H4O3)2] · 3H2O under inert atmosphere (argon) at high (>700°C) temperatures leads to formation of metal–carbon Co–Cu–C compositions. The reaction proceeds by sequential elimination of coordinated ammonia from the cationic portion of DC and decomposition of coordinated salicylate with evolution of phenol and its derivatives.
      PubDate: 2022-04-01
       
  • Enumeration of Melting Diagrams for Four-Component Systems Comprising
           Stoichiometric Compounds

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      Abstract: The previously described algorithm for constructing isobaric–isothermal subsolidus sections of four-component systems comprising stoichiometric compounds is used as the base for developing an approach to the enumeration of melting diagrams of such the systems. The underlying idea of the approach is the placement of different types of invariant points over the tetrahedration elements of the phase diagram. Next, adjacent invariant points are connected by lines on which arrows are placed to indicate the decreasing temperature direction. This procedure is carried out within the limits imposed by the properties of the phase diagrams. Exemplary schematic melting diagrams constructed with the use of the described approach are provided. The results of the work can be used to design an optimization algorithm for an experimental study of phase diagrams, as well as to develop databases for such the diagrams.
      PubDate: 2022-04-01
       
  • Pentagonal-Bipyramidal Oxidorhenium(V) Complex with N4-Tetradentate
           Ligand: Unusual Synthetic Route, Spectroscopic, Crystallographic, and DFT
           Studies

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      Abstract: Herein we report the zwitterionic pentagonal bipyramidal oxidorhenium(V) complex trans-[ReOI2(bpp)] where bpp is (1E,3E)-1,3-bis(pyrimidin-2-ylimino)propan-2-ide anion. The complex trans-[ReOI2(bpp)] was unusually formed from the reaction of trans-[ReOI2(OEt)(PPh3)3] with 2-aminopyrimidine in propan-2-ol in the presence of triethylamine (Et3N). The anionic ligand bpp was formed by oxidorhenium(V)-catalysed dehydroxylation of propane-2-ol followed by condensation with 2-aminopyrimidine, and coordinates to the [ReO]3+ core as tetradentate N-donor chelate. A few numbers of pentagonal bipyramidal complexes are known for oxidorhenium(V), and the complex trans-[ReOI2(bpp)] is another example. The complex was analyzed by 1H NMR, IR, UV-visible and single crystal X-ray crystallography. In addition, density functional theory (DFT) was also studied.
      PubDate: 2022-04-01
       
  • Solid–Liquid Phase Equilibria of the Quaternary System Na+, Mg2+//Cl–,
           

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      Abstract: Solubility data for the quaternary system Na+, Mg2+//Cl–, \({{{\text{B}}}_{4}}{\text{O}}_{7}^{{2 - }}\) –H2O is very important for the separation of magnesium and boron from the salt lake brines in Qaidam Basin. The solubility of the quaternary system Na+, Mg2+//Cl–, \({{{\text{B}}}_{4}}{\text{O}}_{7}^{{2 - }}\) –H2O at T = 298.15 K and p = 0.1 MPa was investigated experimentally with the method of isothermal dissolution equilibrium, and meanwhile physicochemical properties including density, refractive index and pH value were determined. In the phase diagrams of the quaternary system at 298.15 K, there are two invariant points, five univariant isothermal dissolution curves, and four crystallization regions corresponding to NaCl, Na2B4O7·10H2O, MgCl2·6H2O and Mg2B6O11·15H2O, respectively. The density, refractive index and pH value of the quaternary system at 298.15 K present a regular variation with the increasing of Mg2+ concentration.
      PubDate: 2022-04-01
       
  • The Role of Modified Chelating Graphene Oxide for Vanadium Separation from
           Its Bearing Samples

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      Abstract: An efficient vanadium adsorbent, GO-N1-(acetylcarbamothioyl)-2-hydroxy-N4-methyl terephthalamide (GOAMP), was prepared and used for adsorption of vanadium. GOAMP was prepared through interaction of graphene oxide with hydroxyterephthaloyl dichloride under reflux in alkaline media, the structure and morphology of prepared adsorbent GOAMP was investigated using different techniques, Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), surface area BET analysis, and X-ray diffraction (XRD). The results revealed that GOAMP exhibited excellent vanadium adsorption performance in aqueous solutions, with a vanadium adsorption capacity of 229.4 mg/g. Even in the presence of competing ions, GOAMP demonstrated a high degree of vanadium selectivity in the removal of vanadium. After three cycles, uptake capacity could remain over 95 percent, and after another three cycles, it could remain above 90 percent and ultimately above 85 percent for two cycles. This indicates that the GOAMP has greater stability, as well as a high capacity for restoration and reusability than other materials. The adsorption process also matched the Langmuir model and the pseudo-second-order kinetic model, according to the results of the study. The endothermic nature of the adsorption process was revealed by the predicted ΔH° and ΔG° values.
      PubDate: 2022-04-01
       
  • Syntheses, Crystal Structures, and Thermal Analysis of Two
           Co(II)-Coordination Polymers Constructed from the Semirigid
           Tetracarboxylic Acid and Dipyridine Ligand

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      Abstract: Two new coordination polymers, formulated as [Co(L)0.5(2,2-bipy)(H2O)]n (1) and [Co(L)0.5(2,2-bipy)(H2O)2]n·3nH2O (2) (H4L = 5.5'-(benzene)-1,4-diyl-bis(oxy) diterphthalic acid, 2,2-bipy = 2,2'-dipyridine), were synthesized with the semirigid 5.5'-(benzene)-1,4-diyl)-bis(oxy) diterphthalic acid and rigid bipy ligand. The complexes were characterized by IR spectra, elemental analyses, single-crystal and powder X-ray diffractions, and thermal analyses. The asymmetric units of compounds (1 and 2) contain cobalt ions together with one 2,2-bipy and one half of L4− ligands an done coordinated water molecule (for 1) and two coordinated and three uncoordinated water molecules (for 2). The coordination environments of Co(II) ions are CoO4N2, giving distorted octahedral geometries. In crystal of 1, the L4− ligands link Co(II) ions into a 2D wave-like layer structure, and the hydrogen bonds further stabilize the 3D supramolecular architecture. In crystal of 2, the L4− ligands link Co(II) ions into a 1D double chain structure, which are connected into a 3D supramolecular structure by the hydrogen bonds. Moreover, the thermal analyses of complexes (1 and 2) has also been investigated.
      PubDate: 2022-04-01
       
  • Preparation and Luminescence Properties of the Composite of Mixed Europium
           and Tantalum Oxides/ZrO2 + TiO2/Ti

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      Abstract: Luminescent composite coatings based on europium and tantalum mixed oxides have been formed on titanium by combining methods of plasma-electrolytic oxidation and extraction-pyrolytic synthesis. The data on the structure and composition of the surface of the coatings are present. An increase in the number of operations for applying a modifying organic paste to three makes it possible to obtain a layer of a new phase on the surface of the base oxide coating. At an annealing temperature of 600°C and a pyrolysis time of 1 h, the coatings exhibit red luminescence with a maximum at ~618 nm. According to X-ray powder diffraction, the luminescent properties of the coatings are due to the presence of both oxides and europium polytantalates in their composition. Based on the excitation and luminescence spectra at 300 K, the luminescence characteristics of the obtained complex oxide coatings are estimated. An increase in the annealing temperature of the precursors to 900°C leads to an increase in the luminescence intensity of the coatings.
      PubDate: 2022-04-01
       
  • Liquid-Phase Growth of Nanocrystalline ZnO Thin Films and Their
           Gas-Sensitive Properties

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      Abstract: Films of nanocrystalline ZnO have been synthesized in situ on specialized substrates as a result of heat treatment of zinc acetylacetonate hydrate solutions in 1-butanol and ethylene glycol. It has been found that the morphology and coating integrity significantly depend on the solvothermal synthesis solvent. Thus, in ethylene glycol medium a coating with higher integrity and smaller size of ZnO nanoparticles is formed. The ZnO film obtained by [Zn(H2O)(O2C5H7)2] destruction in ethylene glycol demonstrates, as part of a chemical gas sensor, high selectivity and sensitivity to NO2 throughout the temperature range with a maximum chemoresistive response at 250°C (the response to 4–100 ppm NO2 is in the range 2.2–103). It is shown that as the detection temperature decreases, there is a change in the response direction as a result of various surface processes.
      PubDate: 2022-04-01
       
  • Neutron Diffraction Study of Phase Transformations at the Lower Boundary
           of the Homogeneity Range of Cubic Titanium Carbide TiCx

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      Abstract: A neutron diffraction study was made of phase transformations in cubic titanium carbide TiCx at the lower boundary of the homogeneity range TiC0.33–TiC0.47. It was found that the lower boundary of the homogeneity range of the disordered face-centered cubic δ-phase of titanium carbide at 1475 K is at the composition TiC0.33. The high-temperature metastable δ-phase in the composition range TiC0.33–TiC0.47 remains structurally stable at T ≤ 800 K. It was shown that the lower boundary of the homogeneity range of the stable ordered cubic single δ'-phase is at the composition Ti2C0.98. Below this composition, the stable δ'‑phase in the composition range Ti2C0.66–Ti2C0.94 was observed in equilibrium with α-Ti, which suggested that the lower boundary of the homogeneity range of the stable δ'-phase is at the composition Ti2C0.66. In the equilibrium state, the degree of long-range order and the size of antiphase domains in the δ'-phase increase with decreasing carbon content.
      PubDate: 2022-04-01
       
  • Stable Phase Equilibria in the Quinary System Li+, Na+, K+,
           Sr2+//Br––H2O at 308 K

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      Abstract: The isothermal solution equilibrium method was used to study the phase equilibria of the quinary system LiBr–NaBr–KBr–SrBr2–H2O (saturated with KBr) at 308 K. Based on a large amount of experimental data, the phase equilibrium law of the quinary system was obtained. The experimental results indicated that the quinary system is a hydrate type, solid solution was not formed in the system, and the dry basis phase diagram (saturated with KBr) is composed of three invariant points, seven univariant curves and five saturated solid phase crystallization regions (LiBr⋅2H2O, NaBr, NaBr⋅2H2O, SrBr2⋅2H2O, and SrBr2⋅6H2O). Among these crystalline regions, LiBr⋅2H2O has the smallest crystallization area and the largest solubility, which is difficult to separate from saturated solution. In the univariant curve with gradual addition of lithium bromide, the contents of potassium bromide, sodium bromide and strontium bromide all decrease gradually, while the contents of lithium bromide increase gradually, which indicates that lithium bromide has apparently salting out effect on potassium bromide, sodium bromide and strontium bromide. The equilibrium solid phase at three invariant points are identified by X-ray powder diffraction method as KBr + LiBr⋅2H2O + SrBr2⋅2H2O + NaBr, KBr + NaBr + SrBr2⋅2H2O + SrBr2⋅6H2O, and KBr + NaBr⋅2H2O + NaBr + SrBr2⋅6H2O.
      PubDate: 2022-04-01
       
  • Syntheses, Crystal Structures, and Properties of Two Dysprosium
           Coordination Compounds Based on Na2H2L Ligands

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      Abstract: Two coordination compounds, Dy2(H2L)3(phen)2·2(phen) (I) and [Dy(L)(H2O)2·Hbipy]n (II) (Na2H2L is 4,5-dihydroxy-1,3-benzenedisulfonic acid disodium; phen is 1,10-phenanthroline; bipy is 2,2'-bipyridine), were hydrothermally synthesized. They have been characterized by single crystal X-ray diffraction and elemental analyses. In compound I, introduction of the auxiliary chelating ligand phen led to a new Dy phenol-sulfonate with dinuclear structure bridging by the three H2L2– ligands. The interconnection of the dinuclear compounds via the π–π stacking interactions between phen molecules resulted in a one dimensional chain structure. Compound II features a novel one-dimensional chain in which Dy atoms are bridged by the phenol-sulfonate ligands in pentadentate fashion. Dy atom is eight-coordinated by one sulfonate group bidentately, one phenol group unidentately and two phenol groups from one L4– ligand. Compounds I and II exhibit photoluminescence with emissions maximum at 408 and 438 nm, which can be attributed to the intraligand emission state, furthermore, they also display the characteristic emissions of Dy ions, correspond to 4F5/2–6H15/2, 4F5/2–6H13/2 and 4F5/2–6H11/2 transitions, respectively.
      PubDate: 2022-04-01
       
  • Specific Features of Synthesis and Luminescence for Lithium Aluminum
           Spinel LiAl5O8 Doped with Manganese Ions

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      Abstract: Ceramic lithium aluminum spinels doped with manganese ions have been synthesized by a high-temperature solid-state reaction. Samples fabricated by annealing at 1000, 1100, 1200, or 1300°C in air for 4 h have been identified as LiAl5O8, which is cubic spinel belonging to the space group P4132. After annealing at 1000–1200°C, samples with the lattice parameter a = 7.923–7.925 Å show intense red luminescence of Mn4+ ions, which has a narrow luminescence band with a maximum at 662 nm. The excess charge of Mn4+ ions replacing Al3+ ions in the octahedral sites of the LiAl5O8 lattice is compensated for by an excess amount of lithium ions (compared to the stoichiometry) substituting for Al3+ ions adjacent to Mn4+. However, annealing at a higher temperature (1300°C) leads to the almost complete disappearance of the Mn4+ luminescence at 662 nm, although X-ray powder diffraction shows that the crystal structure of these ceramics remains the same one (space group P4132), but the lattice parameter a becomes 7.908 Å, which exactly corresponds to the lattice parameter of the LiAl5O8 single crystal. It is suggested that ceramics with a larger lattice parameter obtained at lower temperatures are solid solutions in which some of the Al3+ ions are replaced by larger Li+ ions. Such solid solutions are not stable and lose Li+ ions upon annealing at a high temperature to convert to the stoichiometric compound LiAl5O8. In stoichiometric LiAl5O8, Mn4+ ions cannot be stabilized in the octahedral sites due to the lack of a charge compensation mechanism, and there is no red luminescence of Mn4+ ions in such samples.
      PubDate: 2022-04-01
       
  • Preparation of Luminophore CаTiO3:Pr3+ by Self-Propagating
           High-Temperature Synthesis

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      Abstract: A self-propagating high-temperature synthesis of CaTiO3:Pr3+ luminophore samples has been carried out using the thermal effect of the reaction between titanium and sodium perchlorate. The effect of the calcium source, praseodymium content, and the Ti/TiO2 ratio in the batch on the luminescent characteristics of the synthesized product has been studied. The phase composition of the synthesis products was determined by X-ray powder diffraction, and the luminescent properties were characterized based on the emission spectra. With the help of energy dispersive analysis, the qualitative and quantitative composition of the luminophore has been established.
      PubDate: 2022-04-01
       
  • Heat Capacity and Thermodynamic Functions of Gadolinium Stannate in the
           Range 0–350 K

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      Abstract: This is the first time that the heat capacity of polycrystalline gadolinium stannate Gd2Sn2O7 is experimentally studied by relaxation and adiabatic calorimetry in the range 2.35–350.35 K. The heat capacity values obtained by the two independent methods in the overlapping range are almost coincident and match the reported gadolinium stannate heat capacity below 7 K. The low-temperature heat capacity anomaly arising from the magnetic transition from the paramagnetic to antiferromagnetic state at TN = 1.015 K continues to 21 K. The measured heat capacity and \(C_{p}^{^\circ }\) (Т) values are used to calculate temperature-dependent thermodynamic functions of Gd2Sn2O7 in the range 0–350 K. The enthalpy of formation ΔfH°(298.15 K), Gibbs free energy of formation ΔfG°(298.15 K), and characteristic Debye temperature ΘD of gadolinium stannate are determined.
      PubDate: 2022-04-01
       
  • Effects of Amino Acids on the Composition and Particle Size of Calcium
           Carbonate Precipitated in Bile

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      Abstract: Calcium carbonate crystallization was experimentally modeled in a model human bile solution. CaCO3 samples were prepared in the presence of variable concentrations of histidine (His), arginine (Arg), methionine (Met), or tryptophan (Trp). The phase and structure-group compositions of the prepared samples were determined by X-ray powder diffraction and FT-IR spectroscopy. CaCO3 percentages, particle sizes, and volume proportions of various size fractions in the prepared powders were determined. The samples prepared in the presence of Arg have the highest yield as impurity-free CaCO3; those prepared in the presence of Met have the lowest yield. The increasing amino acid (AA) concentration gives rise to an increase in the calcium carbonate weight fraction in the syntheses with His or Arg and to a decrease in the syntheses with Met or Trp. The major component of the phase composition in all of the prepared powders is represented by vaterite, a metastable CaCO3 polymorph. The proportion of the aragonite fraction in the solid increases as the Arg or Met concentration in bile increases. Calcium carbonate microparticles with radii less than 10 µm are represented by three fractions. As the His or Trp concentration in the model bile solution increases, the proportion of the small-size fraction increases while the proportion of the coarse-size fraction decreases, with the particle radii increasing in all fractions.
      PubDate: 2022-04-01
       
  • Volumetric Properties of the Dilute Aqueous Solution of Yttrium Sulfate
           from 283.15 to 363.15 K at 101.325 kPa

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      Abstract: To better use rare earth element resources in geothermal water, it is essential to understand the volumetric property and the ion-interaction of the rare earth element aqueous solution systems. In this paper, the densities of aqueous Y2(SO4)3 from 0.00405 to 0.04071 mol kg−1 at 283.15 to 363.15 K were measured using an Anton Paar Digital vibrating-tube densimeter. Apparent molar volumes (Vϕ) and the coefficient of thermal expansion (α) were obtained based on the experimental density data, and the diagrams of the apparent molar volume and coefficient of thermal expansion of Y2(SO4)3(aq) against temperature (T) and molality (m) in the binary system were revealed. The Pitzer single-salt parameters \({{(\beta }}_{{{\text{MX}}}}^{{(0)v}},{{\beta }}_{{{\text{MX}}}}^{{(1)v}},{{\beta }}_{{{\text{MX}}}}^{{(2)v}}\,\,{\text{and}}\,\,C_{{{\text{MX}}}}^{v})\) for Y2(SO4)3 and their temperature-dependent correlation F(i, p, T) = a1 + a2ln(T/298.15) + a3(T − 298.15) + a4/(620 − T) + a5/(T − 227) (where T is temperature in Kelvin, ai are the correlation coefficients) for Y2(SO4)3 were obtained for the first time.
      PubDate: 2022-04-01
       
  • Extraction Properties of Mono- and Bis(diphenylphosphoryl)mono- and
           Diketones toward Actinides and Lanthanides

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      Abstract: Extraction properties toward actinides and lanthanides of phosphorylketones on varying the number of functional phosphoryl and carbonyl groups in the structure of organic ligand have been modeled. Presented data have shown that the studied phosphorylketones I–III as extractants display higher extraction ability with respect to lanthanides as compared with TBP, TOPO, and CMPO. 4,4-Bis(diphenylphosphoryl)butan-2-one III exhibits high extraction ability and selectivity toward U(VI). This compound can be used for the selective recovery and preconcentration of U(VI) from nitric acid solutions
      PubDate: 2022-04-01
       
 
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