共查询到20条相似文献,搜索用时 22 毫秒
1.
N. G. Chernorukov A. V. Knyazev N. Yu. Kuznetsova S. N. Golubev 《Russian Journal of Inorganic Chemistry》2008,53(8):1303-1310
Synthetic procedures have been developed and compounds of composition K x Rb y Cs z TaWO6 (x + y + z = 1) have been obtained. Their structure has been investigated by X-ray diffractometry. It has been shown that a continuous series of solid solutions is formed in the ternary system under study. Thermal decomposition of AITaWO6 compounds (AI = K, Rb, Cs) has been investigated by high-temperature X-ray diffractometry. 相似文献
2.
The subsolidus region of the Ag2MoO4-MgMoO4-Al2(MoO4)3 ternary salt system has been studied by X-ray phase analysis. The formation of new compounds Ag1 ? x Mg1 ? x Al1 + x (MoO4)3 (0 ≤ x ≤ 0.4) and AgMg3Al(MoO4)5 has been determined. The Ag1 ? x Mg1 ? x Al1 + x (MoO4)3 variable-composition phase is related to the NASICON type structure (space group R \(\bar 3\) c). AgMg3Al(MoO4)5 is isostructural to sodium magnesium indium molybdate of the same formula unit and crystallizes in triclinic system (space group P \(\bar 1\), Z = 2) with the following unit cell parameters: a = 9.295(7) Å, b = 17.619(2) Å, c = 6.8570(7) Å, α = 87.420(9)°, β = 101.109(9)°, γ = 91.847(9)°. The compounds Ag1 ? x Mg1 ? x Al1 + x (MoO4)3 and AgMg3Al(MoO4)5 are thermally stable up to 790 and 820°C, respectively. 相似文献
3.
I. V. Korolkov S. A. Gromilov K. V. Yusenko I. A. Baidina S. V. Korenev 《Journal of Structural Chemistry》2005,46(6):1052-1059
The [Ir(NH3)5Cl]2[OsCl6]Cl2 binary complex salt has been prepared, and its structure was investigated by single crystal X-ray diffraction. Crystal data: a = 11.1901(13) Å, b = 7.9138(13) Å, c = 13.4384(18) Å; β = 99.640(3)°, V = 1190.0(2), space group C2/m, Z = 2, FW = 1099.47, d x = 3.068 g/cm3. Thermolysis products of [Ir(NH3)5Cl]2[OsCl6]Cl2, [Ir(NH3)5Cl][OsBr6], (NH4)2[OsCl6]x[IrCl6]1?x , and K2[OsCl6]x[IrCl6]1?x were studied by X-ray phase analysis; the unit cell parameters were refined, and the dependence of volume per atom (V/Z) on the composition of the Ir Os1?x solid solution has been plotted. 相似文献
4.
The subsolidus phase composition of the M2O-CdO-V2O5 systems with M = Li or Na is studied. Double orthovanadates MCdVO4 and MCd4(VO4)3 form solid solutions of composition Li1 ? 2x/3Cd x/3CdVO4 (0 ≤ x ≤ 1, orthorhombic space group Cmcm, modulation at x = 0.6) and Na3 ? 2x Cd3 + x (VO4)3 (0 ≤ x ≤ 0.10 and 0.30 ≤ x ≤ 1, orthorhombic space group Cmcm and Pn21 a or Pnma, respectively). In the range 0.10 < x < 0.30, the end-members of the solid solutions coexist. Isothermal sections of the systems are mapped. 相似文献
5.
Avat Arman Taherpour Ako Yari Fatemeh Ghasemhezaveh Mohammad Ali Zolfigol 《Journal of the Iranian Chemical Society》2017,14(12):2485-2493
The efficiently oxidized various types of 2-substituted imidazolines to the corresponding imidazoles using potassium permanganate supported on silica gel (KMnO4/SiO2) under mild conditions and at room temperature have been reported before. In this study, the competitive concerted, catalytic stepwise (E 1 cb′ Cat .) and E 1 cb′ mechanisms of the oxidative aromatization process of 2-imidazolines to the corresponding imidazoles using KMnO4/SiO2 have been theoretically investigated by DFT-B3LYP/6-31G** method. The achieved data from this computational study confirmed that the reaction occurs by stepwise E 1 cb′ mechanism on the basis of the anomeric effect. 相似文献
6.
Phase relationships in the subsolidus region of the system Na2MoO4-MnMoO4-Cr2(MoO4)3 were studied by means of X-ray diffraction and differential-thermal analyses. The possibility of obtaining a variablecomposition phase Na1?x Mn1?x Cr1+x (MoO4)3 (0 ≤ x ≤ 0.5) and ternary molybdate NaMn3Cr(MoO4)5 was examined. The temperature dependence of the conductivity of the phase Na1?x Mn1?x Cr1+x (MoO4)3 was analyzed. 相似文献
7.
Possibility of layer-by-layer synthesis by colloidal layering of Sb2S3-SiO2 nanocomposite layers from colloid solutions of {[H x Sb2S5] m ?}mNa+ and SiO2 was studied. The composition of the layers synthesized was examined by Raman spectroscopy, transmission spectroscopy in the UV and visible spectral ranges, energy-dispersion micro analysis, and scanning electron microscopy. 相似文献
8.
A. A. Merkulov L. I. Isaenko V. M. Pashkov V. G. Mazur A. V. Virovets D. Yu. Naumov 《Journal of Structural Chemistry》2005,46(1):103-108
The KPb2Cl5 and KPb2Br5 crystals are monoclinic (P21/c) with a microtwinned structure. X-ray analysis of chloride resulted in the parameters a = 8.854(2) Å, b = 7.927(2) Å, c = 12.485(3) Å; β = 90.05(3)°, dcalc = 4.78(1) g/cm3 (STOE STADI4, MoKα, 2θmax = 80°), R1 = 0.0702 for 4094 F ≥ 4 σ(F) reflections. For bromide, a = 9.256(2) Å, b = 8.365(2) Å, c = 13.025(3) Å; β = 90.00(3)°, dcalc = 5.62(1) g/cm3 (Bruker P4, MoKα, 2θmax = 70°), R1 = 0.0692 for 3076 F ≥ 4 (F) reflections. 相似文献
9.
A continuous solid solution LaMn1?y Cr y O3 with an orthorhombic structure is found to exist in the range of 0.0 ≤ y ≤ 1.0. An orthorhombic solid solution La1?x Sr x CrO3 exists in the range of 0.0 ≤ x ≤ 0.1. The stability boundaries are determined for the perovskite phase La1?x Sr x Mn1?y Cr y O3. An isobaric-isothermal section LaMnO3-SrMnO3-SrCrO4-LaCrO3 of the system La2O3-SrO-Mn3O4-Cr2O3 in air at 1100°C is designed. 相似文献
10.
M. G. Zuev 《Russian Journal of Inorganic Chemistry》2007,52(3):424-426
The phase composition has been studied and an equilibrium phase diagram has been designed for the Al2O3-Li2O-R2O5 (R = Ta or Nb) systems in the subsolidus region up to 1000°C and 85 mol % Li2O. New phases with the composition Li1+x Al1?x O2?x , where x = 0–0.67, have been found. 相似文献
11.
Vertical sections CaF2-Na0.4Yb0.6F2.2 and NaF-Ca0.75Yb0.25F2.25 of the system NaF-CaF2-YbF3 were studied by differential thermal analysis. A fluorite solid solution belt between phases of variable composition Ca1?x Yb x F2+x and Na0.5?x Yb0.5+x F2+2x was discovered. A liquidus-surface projection was constructed. The solidification character of the solid solution is unfavorable for growth of optical-quality ternary mixed crystals. 相似文献
12.
Novel complex salts [Au(en)2]Cl(ReO4)2 (I) and [Au(en)2](ReO4)3 (II), en = ethylenediamine, are obtained. Their crystal structures are determined by single crystal X-ray diffraction. Complex I crystallizes in the triclinic crystal system: a = 6.2172(7) Å, b = 7.1644(8) Å, c = 8.8829(8) Å, α = 96.605(4)°, β = 110.000(4)°, γ = 97.802(4)°, P-1 space group, Z = 1, d x = 3.905 g/cm3; complex II crystallizes in the monoclinic crystal system: a = 15.244(2) Å, b = 7.6809(8) Å, c = 9.3476(12) Å, β = 127.004(3)°, C2 space group, Z = 4, d x = 4.057 g/cm3. 相似文献
13.
S. P. Khranenko I. A. Baidina S. A. Gromilov A. V. Belyaev 《Journal of Structural Chemistry》2005,46(6):1060-1065
Powder and single crystal X-ray diffraction studies have been performed for anhydrous nitrate complexes Rb2[Pd(NO3)4] (I) and Cs2[Pd(NO3)4] (II). Crystal data for I: a = 7.843(1) Å, b = 7.970(1) Å, c = 9.725(1) Å; β = 100.39(1)°, V = 597.9(1) Å 3, space group P21/c, Z = 2, d calc = 2.918 g/cm3; for II: a = 10.309(2) Å, b = 10.426(2) Å, c = 11.839(2) Å; β = 108.17(3)°, V = 1209.0(4) Å3, space group P21/c, Z = 4, d calc = 3.408 g/cm3. The structures are formed by isolated [Pd(NO3)4]2? complex anions and alkali metal cations. The plane-square environment of the Pd atom is formed from the oxygen atoms of the monodentate nitrate groups. The geometrical characteristics of the complex anions are analyzed. Compound II has a short contact Pd...Cs 3.252 Å. 相似文献
14.
B. G. Bazarov R. F. Klevtsova A. E. Sarapulova K. N. Fedorov L. A. Glinskaya Zh. G. Bazarova 《Journal of Structural Chemistry》2005,46(4):756-760
Single crystals of triple molybdate of composition 5:1:3 K5Pb0.5Hf1.5(MoO4)6 have been grown and their crystal structure has been solved from X-ray diffraction data (an automated diffractometer X8 APEX, MoK α -radiation, 2173 F(hkl), R = 0.0321). Trigonal unit cell parameters are: a = b = 10.739(2) Å, c = 37.933(9) Å; V = 3789(1) Å3, Z = 6, ρcalc = 4.014 g/cm3, space group \(R\bar 3\). Three-dimensional mixed framework of the structure is formed by two types of MoO4 tetrahedra and Pb and Hf octahedra linking via common O-vertices. Potassium atoms of three types occupy large vacancies in the framework. 相似文献
15.
P. A. Stabnikov A. I. Smolentsev N. V. Pervukhina O. S. Koshcheeva L. N. Komissarova S. V. Borisov 《Journal of Structural Chemistry》2011,52(1):118-124
The structure of aluminum(III) tris-dipivaloylmethanate (Bruker Nonius X8 Apex diffractometer with a 4K CCD detector, λMoK α, graphite monochromator, T = 150(2) K) is determined, and the synthetic procedure for its preparation is suggested. Crystal data are: C2/c space group, a = 28.1587(12) Å, b = 18.5170(7) Å, c = 21.5332(8) Å, β = 97.573(1)°, V = 11129.8(8) Å3, Z = 12, d x = 1.033 g/cm3, R = 6.93. The complex has a molecular structure; the aluminum atom is octahedrally surrounded by six oxygen atoms of three chelating ligands; Al-O distances are 1.860(2)–1.873(2)0A; O-Al-O angles fall within 88.08(9)–91.96(10)° and 177.93(9)–179.83(14)°. The known crystal packings of metal tris-dipivaloylmethanates are analyzed. Three types of the arrangement of the molecules in the crystals denoted as α, β, and γ are identified. 相似文献
16.
G. V. Bazuev T. I. Chupakhina M. A. Lelkozerova 《Russian Journal of General Chemistry》2008,78(10):1843-1848
Attempts of the synthesis in air of complex oxides Sr3RhMnOx and Sr4Rh1.5Mn1.5Ox resulted in revealing formation of a new oxide phase Sr6.3Rh2.35Mn2.35O9 related to quasi-unidimensional family A3n+3m A′ n B3m+n O9m+6n at n = 1 and m = 1. Its structural characteristics and magnetic properties are studied. X-ray data of the obtained phase is indicated on the basis of trigonal cell (spatial group P321) with the parameters: a 9.6239(4) Å; c 1 4.1130(4) Å, c 2 2.4946(2) Å. Manganese and rhodium exist in the compound as the cations Mn4+, Rh3+ and Rh4+, as follows from the data of measuring of magnetic susceptibility in the range 2–300 K. 相似文献
17.
N. I. Kadyrova Yu. G. Zaynulin A. P. Tyutyunnik N. V. Melnikova A. V. Korolev 《Russian Journal of Inorganic Chemistry》2011,56(12):1870-1874
Perovskite-related oxide Tm x Cu3V4O12 (space group Im \(\bar 3\), Z = 2, a = 7.262?7.273 Å) with vacancies in the cationic sublattice has been prepared for the first time under barothermal conditions (p = 7.0?9.0 GPa, T = 900?1100°C). Electric resistivity (10–300 K) and magnetic susceptibility (0–300 K) were studied as a function of temperature. Tm x Cu3V4O12 is shown to have a metallic conductivity and paramagnetism. 相似文献
18.
L. N. Mazalov Yu. P. Dikov N. A. Kryuchkova V. V. Sokolov I. Yu. Filatova E. A. Korotaev A. D. Fedorenko 《Journal of Structural Chemistry》2010,51(1):59
The charged state of atoms in layered cation-substituted disulfides CuCr1?x V x S2 (x = 0?0.4) was studied using X-ray photoelectron spectroscopy. The study was performed with polycrystalline powder and ceramic samples of chromium-copper disulfides. CuCr1?x V x S2 samples were shown to comprise differently charged atoms of chromium, copper and vanadium, the charged state of which varies with the concentration of vanadium cations (x). 相似文献
19.
N. I. Kadyrova Yu. G. Zainulin V. L. Volkov G. S. Zakharova A. V. Korolev 《Russian Journal of Inorganic Chemistry》2007,52(6):825-828
Perovskite-like nonstoichiometric oxide La x Cu3V4O12 (space group Im \(\bar 3\), Z = 2, a = 7.313–7.354 Å) with cation-site vacancies has been prepared for the first time at high pressures (p = 6.0–8.0 GPa) and high temperatures (T = 700–1100°C). The compound has metal-type conductivity and paramagnetic properties, and undergoes a phase transition. 相似文献
20.
A. Yu. Ledneva N. G. Naumov A. V. Virovets S. Cordier Y. Molard 《Journal of Structural Chemistry》2012,53(1):132-137
The structures of three novel octahedral rhenium cluster compounds [Re6S8(CN)2(py)4]·H2O (1), [Re6S8(CN)2(4-Mepy)4] (2), [Re6S8(CN)2(4-Mepy)4]·4-Mepy (3) (py = pyridine, 4-Mepy = 4-methylpyridine) are determined by X-ray crystallography. Crystal data are: C2/m space group, a = 14.813(1) Å, b = 14.772(1) Å, c = 9.2122(6) Å, β = 119.085(2)°, V = 1761.7(2) Å3, d x = 3.318 g/cm3, R = 0.0585 (1); I41/amd space group, a = 16.0018(3) Å, c = 14.7186(5) Å, V = 3768.81(16) Å3, d x = 3.169 g/cm3, R = 0.0489 (2); P21/c space group, a = 9.0452(4) Å, b = 15.8065(7) Å, c = 15.2951(6) Å, β = 103.700(2)°, V = 2124.57(16) Å3, d x = 2.957 g/cm3, R = 0.0245 (3). Molecular cluster complexes interact via π-π stacking affording 3D frameworks in 1 and 2 and chains in 3. 相似文献