共查询到20条相似文献,搜索用时 15 毫秒
1.
A. I. Knyazeva G. S. Skiba N. B. Voskoboinikov 《Russian Journal of Inorganic Chemistry》2009,54(1):125-127
The solubility in the PrCl3-SmCl3-HCl-H2O quaternary water-salt system was studied at 25°C along the 40% hydrochloric acid section (a system with solid solutions and discontinuity). The composition of the discontinuity point was as follows: PrCl3 · 7H2O, 2.33; SmCl3 · 6H2O, 0.11; HCl, 40.05; and H2O, 57.51 wt %. 相似文献
2.
The solubility in the quaternary water-salt systems LaCl3-NdCl3-HCl-H2O (1) and LaCl3-PrCl3-HCl-H2O (2) at 25°C was studied in the section of 40 wt % hydrochloric acid, a system with a eutonic discontinuity. The composition
at the point of discontinuity for the eutonic solution is the following. In system 1: 4.67 wt % LaCl3 · 7H2O, 0.37 wt % PrCl3 · 7H2O, 37.98 wt % HCl, and 56.98 wt % H2O; in system 2: 4.37 wt % LaCl3 · 7H2O, 0.93 wt % NdCl3 · 6H2O, 37.88 wt % HCl, and 56.82 wt % H2O. 相似文献
3.
L. Soliev M. T. Dzhumaev G. Ikbol B. B. Dzhabborov 《Russian Journal of Inorganic Chemistry》2017,62(9):1245-1251
Solubility in the Na,Ca∥CO3,HCO3–H2O system is studied; its phase diagram at 25°C is plotted. 相似文献
4.
Ji-min Yang Jun Ji 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(7):1169-1173
The solubility of ternary system of lithium, magnesium and chloride and refractive indexes have been determined at 60 and
75°C, respectively. Using the experimental results, the phase diagrams of the ternary system were plotted. The single-salt
Pitzer parameters of LiCl and MgCl2 β(0), β(1) and C
ϕ were calculated by using the equations reported by Li Y-H and de Lima at different temperatures, respectively. On the basis
of Pitzer ion-interaction model and solubility product equation for mixed electrolytes, the mixing parameters θLi, Mg, ΨLi, Mg, Cl and equilibrium constant K
sp were evaluated in this system, which were not reported in literature. A complete phase diagram of the ternary system was
predicted at 60 and 75°C. The prediction of solubilities in ternary system was then demonstrated. The calculated solubilities
agreed well with the experimental values. 相似文献
5.
A. V. Kostrikin F. M. Spiridonov I. V. Lin’ko B. E. Zaitsev O. V. Kosenkova S. V. Tarasova L. N. Komissarova 《Russian Journal of Inorganic Chemistry》2011,56(6):928-934
Solubilities in the NaOH-TiO2 · H2O-H2O system at 25°C were studied. The solubility isotherm was found to have two maxima. The formation of two compounds, Na2Ti5O11 · 10H2O and Na2Ti3O7 · 7H2O, was established. 相似文献
6.
Phase equilibria in the Na,K‖CO3,HCO3,F-H2O system at 25°C are studied by the translation method. Twenty nine double-saturation divariant fields, 31 triple-saturation monovariant curves, and 11 quadruple-saturation points for equilibrium solid phases are distinguished in the system. The first looped phase diagram (phase complex) of the title system is designed. 相似文献
7.
Phase equilibria in the system Na,K|SO4,CO3,HCO3-H2O at 25°C are studied by the translation method. Thirty two double-saturation fields, 36 triple-saturation monovariant curves, and 13 quadruple-saturation points are distinguished in the system. The first closed phase diagram (phase complex) of the title system is designed. 相似文献
8.
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
9.
10.
Solubility was studied in the system NaCl–AlCl3–HCl–H2O at 25°C in the section 28 wt % HCl. The system is of the eutonic type and has an extensive sodium chloride crystallization region. The composition of the eutonic solution is the following, wt %: NaCl, 0.47; AlCl3 ? 6H2O, 8.88; HCl, 25.38; and H2O, 65.27. The lines of saturated solutions were approximated by polynomial equations. 相似文献
11.
Haijun Han Ouyang Dong Dongdong Li Dewen Zeng 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2017,91(7):1255-1259
The co-saturation line for the solid phases NaCl(s) and MgCl2 · 6H2O(s) in aqueous solution has been measured by a phase equilibrium at various temperatures. It was found that the Y b (Y b = w(NaCl)/(w(NaCl) + w(MgCl2))) value of the co-saturation line increase with increasing temperature. A new recrystallization approach has been suggested for the purification of MgCl2 · 6H2O(s) containing quite amount of impurity NaCl, i.e., dissolving the crude sample at low temperatures, followed by evaporating and phase separating at high temperatures. Applying the proposed approach a crude MgCl2 · 6H2O(s) sample can be purified to the level of Y b = 0.17% by only one crystallization process. 相似文献
12.
G. O. Yur’ev V. A. Keskinov K. N. Semenov N. A. Charykov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2017,91(5):797-799
The solubility in a ternary fullerenol-d (C60(OH)22–24)–SmCl3–H2O system at 25°C is studied via isothermal saturation in ampules. The solubility diagram is shown to be a simple eutonic one that consists of two branches corresponding to the crystallization of fullerenol-d (C60(OH)22–24 · 30H2O) and samarium(III) chloride SmCl3 · 6H2O crystallohydrates and contains one nonvariant eutonic point corresponding to saturation with both crystallohydrates. The long branch of C60(OH)22–24 · 30H2O crystallization shows the effect of fullerenol-d salting out of saturated solutions; in contrast, the short branch of SmCl3 · 6H2O crystallization shows the pronounced salting-in effect of samarium(III) chloride. 相似文献
13.
A. I. Knyazeva G. S. Skiba N. B. Voskoboinikov 《Russian Journal of Inorganic Chemistry》2008,53(3):430-433
Solubility has been studied in the LaCl3-YbCl3-HCl-H2O water-salt system at 25°C along the (40 ± 0.2)% HCl section; this is a eutonic-type system. The composition of the eutonic solution is as follows (wt %): LaCl3 · 7H2O, 4.67, YbCl3 · 6H2O, 0.37; HCl, 37.98; and H2O, 56.98. 相似文献
14.
Phase and conversion equilibria in the quaternary reciprocal water–salt system 2HCOONa + CaCl2 ? (HCOO)2Ca + 2NaCl–H2O at 25°C were studied for the first time to determine the concentration parameters of the production of calcium formate from sodium formate. 相似文献
15.
The solubility was studied in the system NaCl–AlCl3?SrCl2–HCl–H2O of the eutonic type at 25°C in the section 28 wt % HCl. It was determined that it is possible to derive equations of the solubility surface of crystallizing salts and to calculate the composition of the eutonic solution. 相似文献
16.
A. K. Vasilevskaya O. V. Almjasheva V. V. Gusarov 《Russian Journal of General Chemistry》2015,85(12):2673-2676
Formation of zirconia nanocrystals in the course of thermal treatment of an X-ray amorphous zirconium oxyhydroxide was studied. It was shown that the formation of tetragonal and monoclinic polymorphs of ZrO2 in the temperature range from 500 to 700°C occurs owing to dehydration and crystallization of amorphous hydroxide. An increase of the temperature up to 800°C and higher activates mass transfer processes and, as a result, activates the nanoparticle growth and increases the fraction of the phase based on monoclinic modification of ZrO2 due to mass transfer from the nanoparticles with the non-equilibrium tetragonal structure. Herewith, formed ZrO2 nanocrystals with monoclinic structure have a broad size distribution of crystallites, and the average crystallite size after thermal treatment at 1200°C for 20 min is about 42 nm. 相似文献
17.
I. M. Gusev M. Yu. Skripkin K. K. Spektor G. L. Starova 《Russian Journal of General Chemistry》2011,81(4):623-627
Solubility in the ternary systems MgBr2-NR4Br-H2O (R = Me, Et, Bu) at 25°C was determined by the isothermal saturation method. A comparative analysis of phase diagrams was
fulfilled. The results obtained were interpreted in the context of competition between hydration and association processes
in water-salt systems. The structure of double salts NMe4Br·MgBr2·6H2O and NEt4Br·MgBr2·8H2O was determined, and the possibility for predicting compositions of crystallizing double salts on the basis of crystallographic
characteristics of ions was analyzed. 相似文献
18.
Ji-min Yang Xiao-lin Liu Pei-Pei Liang 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(7):1149-1154
The solubility in the NaCl-CaCl2-H2O and KCl-CaCl2-H2O systems were determined at 75°C and the phase diagrams and the diagram of physicochemical property vs composition were plotted.
One invariant point, two univariant curves, and two crystallization zones, corresponding to potassium chloride, dihydrate
(CaCl2 · 2H2O) showed up in the phase diagrams of the ternary systems. The mixing parameters θM, Ca and ΨM, Ca, Cl (M = Na or K) and equilibrium constant K
sp were evaluated in NaCl-CaCl2-H2O and KCl-CaCl2-H2O systems by least-squares optimization procedure, in which the single-salt Pitzer parameters of NaCl, KCl, and CaCl2 β(0), β(1), β(2), and C
Φ were directly calculated from the literature. The results obtained were in good agreement with the experimental data. 相似文献
19.
E. A. Fedorova S. A. Bakhteev L. N. Maskaeva R. A. Yusupov V. F. Markov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2016,90(6):1274-1279
Equilibrium processes in the Ga(NO3)3–H2O–NaOH system are simulated with allowance for the formation of precipitates of various compositions using experimental data from potentiometric titration and theoretical studies. The values of the instability constants are calculated along with the stoichiometric compositions of the resulting compounds. It is found that pH ranges of 1.0 to 4.3 and 12.0 to 14.0 are best for the deposition of gallium chalcogenide films. 相似文献
20.
N. V. Podval’naya G. S. Zakharova Y. Liu 《Russian Journal of Inorganic Chemistry》2017,62(8):1104-1110
The phase and chemical compositions of precipitates formed in the system Zn(VO3)2–HCl–VOCl2–H2O at pH 1?3, molar ratio V4+: V5+ = 0.1?9, and 80°C were studied. It was shown that, within the range 0.4 ≤ V4+: V5+ ≤ 9, zinc vanadate with vanadium in a mixed oxidation state forms with the general formula ZnxV4+ yV5+ 2-yO5 ? nH2O (0.005 ≤ x ≤ 0.1, 0.05 ≤ y ≤ 0.3, n = 0.5?1.2). Vanadate ZnxV2O5 ? nH2O with the maximum tetravalent vanadium content (y = 0.30) was produced within the ratio range V4+: V5+ = 1.5?9.0. Investigation of the kinetics of the formation of ZnxV2O5 ? nH2O at pH 3 determined that tetravalent vanadium ions VO2+ activate the formation of zinc vanadate, and its precipitation is described by a second-order reaction. It was demonstrated that, under hydrothermal conditions at pH 3 and 180°C, zinc decavanadate in the presence of VOCl2 can be used as a precursor for producing V3O7 ? H2O nanorods 50–100 nm in diameter. 相似文献