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T. V. Gubanova I. K. Garkushin G. D. Sinitsin 《Russian Journal of Inorganic Chemistry》2018,63(4):543-548
The binary system KVO3–K2CrO4 and two ternary systems, LiBr–LiVO3–Li2CrO4 and KBr–KVO3–K2CrO4, were studied. In the ternary systems, the compositions and melting points of eutectic alloys were determined by differential thermal analysis: (49.0 mol % LiBr, 5.0 mol % LiVO3, 46.0 mol % Li2CrO4, 400°C) and (17.0 mol % KBr, 78.0 mol % KVO3, 5.0 mol % K2CrO4, 458°C), respectively. 相似文献
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I. A. Kyuntsel 《Journal of Structural Chemistry》2005,46(5):924-926
The temperature dependence of the 35Cl NQR frequencies and spin-lattice relaxation times has been investigated for a trigonal-bipyramidal vn complex SbCl3·NH2C6H5. Thermally activated motion of chlorine atoms (pseudorotation) was not revealed in the complex, in contrast to the vπ complexes of SbCl3 with related molecular structures. The high potential barrier of pseudorotation in the aniline complex is likely to be due to the unusually high nonequivalence of Sb-Cl chemical bonds. 相似文献
4.
Sh. G. Mamedov I. B. Bakhtiyarly G. R. Gurbanov 《Russian Journal of Inorganic Chemistry》2016,61(9):1187-1190
The Sn2Sb6S11–PbSnSb4S8 system was studied by physicochemical analysis methods (differential thermal, X-ray powder diffraction, and microstructural analyses and microhardness and density measurements). It was found that this system is a quasi-binary section of the SnS–PbS–Sb2S3 ternary system of the eutectic type. The coordinates of the eutectic are 42 mol % PbSnSb4S8 and 600 K. In the studied system, regions of solid solutions were detected, which extend for solid solutions based on Sn2Sb6S11 to 4 mol % PbSnSb4S8 (α) and for solid solutions based on PbSnSb4S8 to 6 mol % Sn2Sb6S11 (β). 相似文献
5.
In this study, mechanical activation process was used for intimate mixing as well as producing finely ground particles, increased surface area and improved chemical reactivity of milled materials for producing SrTiO3 from commercially pure strontium carbonate and TiO2 as a contributive process. Characterization of milled powder mixture by X-ray diffraction analysis showed that disappearing, decreasing and/or shifting of the patterns occurred with mechanical activation that means amorphization was taken place. Amorphization was also demonstrated by FT-IR analysis where shift of band centers as well as the decrement of transmittance related to CO3 was observed. Advantage of amorphization was established with high-temperature XRD analysis which showed 1300 °C was not enough for non-activated mixture to form SrTiO3, whereas structure only composed of SrTiO3 at 1000 °C for activated ones. The reason for this phenomenon was investigated by DTA-TG analysis, and it was based on energy accumulation originated from mechanical activation that corresponds to peak temperature shifting to the lower temperatures and CO2 liberation at mechanical activation step arising from local temperature rising at the vial during high-energy milling that was understood from peak temperature, and area decrement of endothermic peak corresponds to decomposition of SrCO3. 相似文献
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Summary. Zr5Ir2In4 was synthesized by reaction of the elements in a glassy carbon crucible in a water-cooled sample chamber of an induction furnace. The sample was characterized by X-ray diffraction on both powder and single crystals. Zr5Ir2In4 crystallizes with a pronounced Lu5Ni2In4 type subcell, space group Pbam, a=1739.5(6), b=766.3(2), c=338.9(2) pm. Weak additional reflections force a doubling of the subcell c axis. The superstructure of Zr5Ir2In4 is of a new type: Pnma, a=1739.5(6), b=677.8(2), c=766.3(2) pm, wR2=0.0529, 1592 F2 values, and 60 variable parameters. The group-subgroup scheme for the klassengleiche symmetry reduction is presented. The formation of the superstructure is most likely due to a puckering effect (size of the iridium atoms). The crystal chemistry of Zr5Ir2In4 is briefly discussed. 相似文献
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I. B. Bakhtiyarly G. M. Fatullaeva O. Sh. Kerimli 《Russian Journal of Inorganic Chemistry》2018,63(7):962-965
The boundaries of the glass formation region in the ternary system La2O3–As2S3–Er2O3 were found. Transparent glass of composition (La2O3)0.03(As2S3)0.90(Er2O3)0.07 was studied by X-ray photoelectron and Raman spectroscopy. The intensities of the bands characterizing As–S, La–O, and Er–O bonds increased, and these bands were shifted toward higher energies. This was due to an increase in the covalence of these bonds and probably due to the formation of new bonds in the glasses. Samples in the glass formation region are resistant at 300 K to air, water, and organic solvents. 相似文献
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R. S. Mirzoev R. A. Shetov M. Kh. Ligidov R. M. El’mesova 《Russian Journal of Inorganic Chemistry》2010,55(1):96-102
Phase formation in the Na2MoO4-K2MoO4-H2O system was studied at 25°C. Two incongruently saturating complex phases are formed in this system: Na3K(MoO4)2 · 9H2O and NaK3(MoO4)2. The densities, refractive indices, and dynamic viscosities of saturated solutions of the system were determined; molar volume
and ionic strength isotherms were calculated. A correlation relation was found between solubility and solution properties
in the system. The indicated double salts were recovered and characterized using chemical analysis, powder X-ray diffraction,
complex thermal analysis, and IR spectroscopy. 相似文献
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Single crystal X-ray diffraction study of glycine phosphite C2H5NO2·H3PO3 was performed (monoclinic, space group P21/c, a = 7.401(3) Å, b = 8.465(3) Å, c = 9.737(3) Å; β = 100.73(5)°, Z = 4). It has been found that one of hydrogen atoms is located at the centre of symmetry forming two strong hydrogen bonds to yield H4P2O 6 ?2 dimers, while another hydrogen atom is statistically disordered over two positions and organizes the dimers into an infinite corrugated chain. The ordering of this hydrogen atom position and/or displacement of the other one from the centre of symmetry will lead to the loss of symmetry centre and lowering of the point group symmetry from C2h to piezo-active group C2 or C s . 相似文献
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M. V. Vishnetskaya M. S. Ivanova M. Ya. Mel’nikov 《Moscow University Chemistry Bulletin》2018,73(5):260-263
The transformation of carbon dioxide in aqueous emulsions of perfluorons in the presence of oxygen in the air results in the formation of a mixture of oxalic acid and a minor set of organic compounds C4–C8. The maximum CO2 consumption occurs in the emulsion with the C8F18: H2O vol/vol ratio of 1: 0.42 at pH 2.4; the H2C2O4 yield is 11 mol %. 相似文献
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I. Ya. Zaitseva I. S. Kovaleva V. A. Fedorov 《Russian Journal of Inorganic Chemistry》2010,55(2):261-268
Component interactions in the CsBr—Cs2ZnBr4—Cs2CdBr4—Cs2HgBr4 system were studied using differential thermal analysis (DTA) and powder X-ra y diffraction. The system is characterized
by a continuous solid solution series. New compounds have not been found. 相似文献
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Y. I. Jafarov A. M. Mirzoeva M. B. Babanly 《Russian Journal of Inorganic Chemistry》2008,53(1):146-152
Phase equilibria in the reciprocal system 3Tl2S + Sb2Se3 ? 3Tl2Se + Sb2S3 are investigated by DTA, X-ray powder diffraction, and emf measurements. Some polythermal sections, the isothermal section of the phase diagram at 400K, and the liquidus-surface projection for this system are constructed. The types and coordinates of invariant and univariant equilibria are determined. It is shown that the system is non-diagonal. Broad regions of solid solutions are found on the basis of the binary compounds Tl2S and Tl2Se and along the boundary system Sb2S3-Sb2Se3 and the sections Tl3SbS3-Tl3SbSe3, TlSbS2-TlSbSe2, and TlSb3S5-TlSb3Se5 of the phase diagram. 相似文献
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E. E. Masalovich M. Yu. Sabov I. E. Barchii A. M. Solomon 《Russian Journal of Inorganic Chemistry》2016,61(4):507-510
Phase equilibria in the systems TlBiSe2–Tl9BiSe6–PbSe and Tl9BiSe6–Tl4PbSe3–PbSe were studied by differential thermal, X-ray powder diffraction, and microstructural analyses. State diagrams of the quasi-binary sections Tl9BiSe6–Tl4PbSe3, TlBiSe2–PbSe, and Tl9BiSe6–PbSe were constructed, and so were projections of liquidus surfaces and isothermal sections at 600 K for the secondary quasi-ternary systems TlBiSe2–Tl9BiSe6–PbSe and Tl4PbSe3–Tl9BiSe6–PbSe. The coordinates of invariant points and the boundaries of solid solutions were determined. 相似文献
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Norio Saito Pierric Lemoine Noée Dumait Maria Amela-Cortes Serge Paofai Thierry Roisnel Vivian Nassif Fabien Grasset Yoshiki Wada Naoki Ohashi Stéphane Cordier 《Journal of Cluster Science》2017,28(2):773-798
We report here the synthesis, the crystal structure and the luminescent properties of the new cluster compounds Cs2Mo6Cl14·H2O and Cs2Mo6Br14·H2O. Single-crystal X-ray diffraction performed on Cs2Mo6Cl14·H2O indicates that the compound crystallizes in the monoclinic space group C2/c with refined cell parameters a = 19.578 Å, b = 15.151 Å, c = 9.347 Å, and β = 115.64°. The structure can be described from discrete \(\left[ {{\text{Mo}}_{ 6} {\text{Cl}}^{\text{i}}_{ 8} {\text{Cl}}^{\text{a}}_{ 6} } \right]^{ 2- }\) anionic cluster units arranged in a “A–A’–A–A’” pseudo prismatic stacking parallel to (b, c) plane with both Cs+ cations and water molecules located between the layers. Moreover, the centric character of the trigonal structure of Cs2Mo6Cl14 was also studied by combination of single-crystal X-ray diffraction and both X-ray and neutron powder diffraction. The results suggest an important influence of the sample preparation on the symmetry of the crystal structure. The crystal structure relationship between the \(\left[ {{\text{Mo}}_{ 6} {\text{Cl}}^{\text{i}}_{ 8} {\text{Cl}}^{\text{a}}_{ 6} } \right]^{ 2- }\) anionic cluster unit arrangements in Cs2Mo6Cl14 and Cs2Mo6Cl14·H2O is discussed. Finally, the characterization of the luminescent properties of Cs2Mo6X14 and Cs2Mo6X14·H2O (X = Cl, Br) indicates that emission profile is comparable regardless existence of water molecule in the crystal structure. 相似文献
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Alexander V. Zabula Alexander S. Filatov Marina A. Petrukhina 《Journal of Cluster Science》2010,21(3):361-370
The tetranuclear mixed-valent oxo-cluster [SnIISnIVO(O2CCF3)4]2 (1) has been prepared by reacting SnCl2 with AgO2CCF3 in a sealed ampoule at 90 °C. Alternatively, 1 was obtained by acidolysis of Ph3SnSnPh3 with trifluoroacetic acid in solution. The X-ray diffraction study of 1 revealed the presence of a SnIIOSn2IVOSnII core comprised of the penta-coordinated divalent and six-coordinated tetravalent tin atoms. The 119Sn NMR studies confirmed the stability of the cluster in solution and the presence of two different oxidation states of tin.
An acidolysis of Ph3SnSnPh3 in the presence of [Cu2II(O2CCF3)4] followed by sublimation of the resulting product at 90 °C afforded the first trinuclear mixed metal Sn–Cu cluster [(C6H5)2Sn2IVCuIIO(O2CCF3)6] (2). The X-ray diffraction analysis of 2 revealed the presence of two phenyl groups attached to the six-coordinated tin(IV) atoms and the tetragonal pyramidal environment
of the copper(II) atom. Both complexes have been obtained free of exogenous ligands. 相似文献
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The optimal structures and the vibrational frequencies of H-bonded complexes formed from one-two CBr3COOH molecules or the CBr3CO 2 – anion with water molecules are calculated by density functional theory (B3LYP/6-31++G(d,p)). The comparison of the obtained results with the known Raman spectra of the CBr3COOH–H2O and NaCBr3CO 2 – ·H2O solutions (with component molar ratios of ≤1:16) shows that they include stable hydrates: CBr3COOH·H2O and CBr3CO 2 – ·(H2O)6. The first one has a cyclic form, and the second has a cubic globular form. The vibrational band frequencies of the CBr3COOH molecule and the CBr3CO 2 – anion in the spectra of both solutions are almost completely determined by the mutual arrangement of units in these hydrates. 相似文献
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P. Mošner K. Vosejpková L. Koudelka L. Beneš 《Journal of Thermal Analysis and Calorimetry》2012,107(3):1129-1135
The effect of TeO2 additions on the thermal behaviour of zinc borophosphate glasses were studied in the compositional series (100 − x)[0.5ZnO–0.1B2O3–0.4P2O5]–xTeO2 by differential scanning calorimetry, thermodilatometry and heating microscopy thermal analysis. The addition of TeO2 to the starting borophosphate glass resulted in a linear increase of glass transition temperature and dilatometric softening
temperature, whereas the thermal expansion coefficient decreased. Most of glasses crystallize under heating within the temperature
range of 440–640 °C. The crystallization temperature steeply decreases with increasing TeO2 content. The lowest tendency towards crystallization was observed for the glasses containing 50 and 60 mol% TeO2. X-ray diffraction analysis showed that major compounds formed by annealing of the glasses were Zn2P2O7, BPO4 and α-TeO2. Annealing of the powdered 50ZnO–10B2O3–40P2O5 glass leads at first to the formation of an unknown crystalline phase, which is gradually transformed to Zn2P2O7 and BPO4 during subsequent heating. 相似文献
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S. Z. Imamaliyeva T. M. Gasanly F. M. Sadygov M. B. Babanly 《Russian Journal of Inorganic Chemistry》2018,63(2):262-269
The ternary system Tl–Gd–Te within the composition range Tl2Te–Tl5Te3–Tl9GdTe6 was studied by a set of physicochemical analysis methods. Some internal polythermal sections and the isothermal section at 300 K of the phase diagram were built, projections of the liquidus and solidus surfaces were constructed, and the graphs of the concentration dependences of the parameters and microhardness were plotted. It was shown that much (more than 90%) of the area of the concentration triangle is occupied by the homogeneity region of solid solutions with the Tl5Te3 structure (δ-phase). Solid solutions based on Tl2Te (α-phase) form within a narrow region. The regions of the α- and δ-phases are separated by two-phase region α + δ. 相似文献
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I. E. Barchii A. R. Tats’kar’ A. A. Fedorchuk A. I. Pogodin A. M. Solomon 《Russian Journal of Inorganic Chemistry》2018,63(1):104-110
For the first time, by differential thermal, X-ray powder diffraction, and microstructural analyses, phase equilibria in the ternary system Tl9SbSe6–TlSbSe2–Tl4SnSe4 were investigated and the state diagram of the polythermal section Tl4SnSe4–Tl3SbSe3, the projection of the liquidus surface on the concentration triangle, and the isothermal section at 423 K were constructed. The types and coordinates of invariant processes, the lines of monovariant equilibria, and their temperature ranges were found. The formation mechanism and nature of solid solutions based on ternary compounds Tl9SbSe6 and TlSbSe2 were studied in terms of crystal chemistry. 相似文献