共查询到20条相似文献,搜索用时 15 毫秒
1.
Zh. A. Kochkarov Z. A. Sokurova Z. Zh. Kochkarov 《Russian Journal of Inorganic Chemistry》2018,63(7):944-949
The phase diagram of the ternary reciprocal system K, Pb∥Cl, WO4 was studied for the first time by the calculation–experimental method and differential thermal and X-ray powder diffraction analyses. Chemical interactions between components were described, metathesis and complexation reactions were revealed, and the coordinates of binary and ternary eutectics were found (mol %): e4(410°C, 48% KCl, 52% PbCl2), e5(424°C, 23% KCl, 77% PbCl2), P(490°C, 63.5% KCl, 36.5% PbCl2), e6(487°C, 91% PbCl2, 9% PbWO4), e7(428°C, 30.5% KCl, 60.5% PbCl2, 9% PbWO4) (eutectic in the stable section D2–PbWO4), e8(650°C, 80% KCl, 20% PbWO4), e9(650°C, 70% KCl, 15% K2WO4, 15% PbWO4) (binary eutectic in the stable section D1–KCl), E1(620°C, 59% KCl, 34% K2WO4, 7% PbWO4), E2(640°C, 75% KCl, 5% K2WO4, 20% PbWO4), E3(400°C, 46% KCl, 6% PbWO4, 48% PbCl2), E4(410°C, 21% KCl, 9% PbWO4, 70% PbCl2), and Pо(468°C, 56% KCl, 10% PbWO4, 34% PbCl2). 相似文献
2.
E. I. Frolov M. O. Shashkov I. K. Garkushin 《Russian Journal of Inorganic Chemistry》2014,59(3):268-273
By differential thermal analysis, the coordinates of the following characteristic points in the KBr-KVO3-K2MoO4 system were determined: a eutectic in the KBr-KVO3 system (12% KBr, 88% KVO3, T melt = 458°C), a eutectic in the KBr-KVO3-K2MoO4 ternary system (12.8% KBr, 84.7% KVO3, 2.5% K2MoO4,T melt = 430°C), and also three points of polymorphic transitions in K2MoO4 ((1) δ ? γ: 21.7% KBr, 72.3% KVO3, 6% K2MoO4,T melt = 476°C; (2) γ ? β: 19% KBr, 78% KVO3, 3% K2MoO4,T melt = 450°C; and (3) γ ? β: 6% KBr, 89% KVO3, 5% K2MoO4,T melt = 450°C). For elements of the ternary system, phase equilibria were described. 相似文献
3.
T. V. Gubanova E. I. Frolov I. K. Garkushin 《Russian Journal of Inorganic Chemistry》2009,54(5):792-796
Phase equilibria in the LiF-LiBr-LiVO3 and LiBr-Li2SO4-LiVO3 systems have been investigated by differential thermal analysis. Eutectic compositions have been revealed (mol %). In the LiF-LiBr-LiVO3 system, 16.8% LiF, 52.0% LiBr, 31.2% LiVO3 with a melting point of 428°C; in the LiBr-Li2SO4-LiVO3 system, 52.0% LiBr, 38.0% LiVO3, 10.0% Li2SO4 with a melting point of 444°C. Crystallization fields of the phases have been demarcated. 相似文献
4.
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
5.
Tatyana V. Balashova Dmitry M. Kusyaev Tatyana I. Kulikova Olga N. Kuznetsova Frank T. Edelmann Prof. Dr. Stephan Gießmann Steffen Blaurock Mikhail N. Bochkarev Prof. Dr. 《无机化学与普通化学杂志》2007,633(2):256-260
The reactivity of neodymium diiodide, NdI2 ( 1 ), towards organosilicon, ‐germanium and ‐tin halides has been investigated. Compound 1 readily reacts with Me3SiCl in DME to give trimethylsilane (6 %), hexamethyldisilane (4 %) and (Me3Si)2O (19 %). The reaction with Et3SiBr in THF results in formation of Et3SiSiEt3 (17 %) and Et3SiOBun (34 %). Alkylation of Me3SiCl with PrnCl in the presence of 1 in THF affords Me3SiPrn (10 %), Me3SiOBun (52 %) and Me3SiSiMe3 (1 %). The main product identified in the reaction mixture formed upon interaction of 1 with dichlorodimethylsilane Me2SiCl2 in THF is di‐n‐butoxydimethylsilane Me2Si(OBun)2 (54 %) together with minor amounts of Me2Si(OBun)Cl. The reaction of 1 with Me3GeBr under the same conditions produces Me3GeGeMe3 (44 %), Me3GeH (3 %), and Me3GeI (7 %). An analogous set of products was obtained in the reaction with Et3GeBr. Treatment of trimethyltin chloride with 1 causes reduction of the former to tin metal (74 %). Me3SnH (7 %) and hexamethyldistannane (11 %) were identified in the volatile products. The reaction of 1 with Me3SiI provides straightforward access to hepta‐coordinated NdI3(THF)4 ( 2 ), the structure of which was determined by X‐ray diffraction. 相似文献
6.
The isoplethic sections in the diagram of the quaternary system Na+ , Mg2+ //Cl– , SO2– 4 –H2 O were established at 25 and 30oC by analytical and conductometric measurements. Three compounds can be observed in the isoplethic sections: NaCl, Na2 SO4 and MgNa2 (SO4 )2 4 H2 O. Seven fields are determined, relating to the precipitation of one, two or three salts. The solubility range of MgNa2 (SO4 )2 4 H2 O is wide, while the liquidus curve of Na2 SO4 is very short. The compositions, expressed in Jänecke coordinates, at the eutonic and peritonic points, respectively, were: 42.70% Cl– and 745% H2 O; 79.47% Cl– and 787% H2 O; 71.6% Cl– and 744% H2 O at 25°C; and 48.80% Cl– and 715% H2 O; 80.20% Cl– and 778% H2 O; 70.14% Cl– and 707% H2 O at 30°C. 相似文献
7.
Phase equilibria in the LiCl–LiBr–Li2SO4 ternary system and the LiCl–LiBr–Li2SO4–Li2MoO4 quaternary system were studied by differential thermal analysis. The compositions and temperatures of minima in the ternary and quaternary systems were determined to be (31.2 mol % LiCl, 46.8 mol % LiBr, 22.0 mol % Li2SO4, 460°C) and (25.2 mol % LiCl, 30.2 mol % LiBr, 14.6 mol % Li2SO4, 30.0 mol % Li2MoO4, 411°C), respectively. 相似文献
8.
E. I. Malysheva I. K. Garkushin T. V. Gubanova E. I. Frolov 《Russian Journal of Inorganic Chemistry》2011,56(11):1824-1828
Phase equilibria in the Li,K‖Cl,MoO4 ternary mutual system were studied by differential thermal analysis (DTA). The characteristics of the following three ternary
eutectics were determined: E
1: 348°C, 41 mol % KCl, 7.75 mol % Li2MoO4, and 51.25 mol % LiCl; E
2: 475°C, 44 mol % KCl, 17.25 mol % Li2MoO4, and 38.75 mol % LiCl; and E
2: 477°C, 35 mol % KCl, 47 mol % Li2MoO4, and 18 mol % LiCl. 相似文献
9.
Mikkelsen L. Larsen P. H. Linderoth S. 《Journal of Thermal Analysis and Calorimetry》2001,64(3):879-886
The isothermal and constant heating rate oxidation behaviour of the alloy Fe78Cr22 was examined in air with 1% H2O and in 7% H2/93% Ar with 1% or 12% H2O. The measurements were performed in the temperature range 700–1300°C. The effect of surface treatment prior to oxidation
was examined. A Cr2O3 scale developed slowly up to900°C. At 1100°C a catastrophic oxidation was observed after heat treatment for 70 h in air with
1% H2O and in 7% H2/93% Ar with 12% H2O. The scale developed in these cases consisted of iron rich oxides such as Fe2O3 or FeCr2O4, in contrast to the more protective Cr2O3 scale seen under other test conditions. Possible causes for the catastrophic oxidation are discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
Salwinder Singh Dhaliwal Vivek Sharma Arvind Kumar Shukla Janpriya Kaur Vibha Verma Prabhjot Singh Harkirat Singh Shams H. Abdel-Hafez Samy Sayed Ahmed Gaber Reham Ali Akbar Hossain 《Molecules (Basel, Switzerland)》2021,26(24)
Biofortification of pulse crops with Zn and Fe is a viable approach to combat their widespread deficiencies in humans. Lentil (Lens culinaris Medik.) is a widely consumed edible crop possessing a high level of Zn and Fe micronutrients. Thus, the present study was conducted to examine the influence of foliar application of Zn and Fe on productivity, concentration, uptake and the economics of lentil cultivation (LL 931). For this, different treatment combinations of ZnSO4·7H2O (0.5%) and FeSO4·7H2O (0.5%), along with the recommended dose of fertilizer (RDF), were applied to the lentil. The results of study reported that the combined foliar application of ZnSO4·7H2O (0.5%) + FeSO4·7H2O (0.5%) at pre-flowering (S1) and pod formation (S2) stages was most effective in enhancing grain and straw yield, Zn and Fe concentration, and uptake. However, the outcome of this treatment was statistically on par with the results obtained under the treatment ZnSO4·7H2O (0.5%) + FeSO4·7H2O (0.5%) at S1 stage. A single spray of ZnSO4·7H2O (0.5%) + FeSO4·7H2O (0.5%) at S1 stage enhanced the grain and straw yield up to 39.6% and 51.8%, respectively. Similarly, Zn and Fe concentrations showed enhancement in grain (10.9% and 20.4%, respectively) and straw (27.5% and 27.6% respectively) of the lentil. The increase in Zn and Fe uptake by grain was 54.8% and 68.0%, respectively, whereas uptake by straw was 93.6% and 93.7%, respectively. Also the benefit:cost was the highest (1.96) with application of ZnSO4·7H2O (0.5%) + FeSO4·7H2O (0.5%) at S1 stage. Conclusively, the combined use of ZnSO4·7H2O (0.5%) + FeSO4·7H2O (0.5%) at S1 stage can contribute significantly towards yield, Zn and Fe concentration, as well as uptake and the economic returns of lentil to remediate the Zn and Fe deficiency. 相似文献
11.
Yan Liu Junxia Wang Guangdong Zhou Mo Xian Yingli Bi Kaiji Zhen 《Reaction Kinetics and Catalysis Letters》2001,73(2):199-208
Oxidative dehydrogenation of propane to propene was investigated over Ba- promoted Ni0.9MoO4 catalysts (molar ratio of Ba/Mo: 1%, 3%, 6%, 9%, 12%, 15%). The selectivity for propene increases with the increasing number
of basic sites on the catalyst, and molybdenum ions play an important role in propane activation. No significant deactivation
of the 6% Ba- Ni0.9MoO4 and Ni0.9MoO4 at 773 K for 80 h and for 40 h, respectively, appeared, indicating that the 6% Ba- Ni0.9MoO4 has great advantage over the Ni0.9MoO4.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
12.
The mechanical and morphological characteristics of PA6/ABS (60/40)-based hybrid composite containing HNO3-treated short carbon fibers (HSCF) and CaCO3 nanoparticles have been experimentally studied. A counter-rotating twin-screw extruder and an injection molding machine were employed to produce different samples containing 10 wt % of HSCF and 0, 2, 5 and 8 wt % of CaCO3 nanoparticles. The SEM observations indicated high-quality adhesion between HNO3-surface treated carbon fibers and PA6/ABS polymer matrix. In addition, the morphological studies showed that the inclusion of CaCO3 nanoparticles caused a significant effect on the ABS particle dispersion in PA6/ABS matrix. The mechanical properties assessments revealed that the incorporation of 10 wt % HSCF into the PA6/ABS can significantly improve tensile strength (82%), tensile modulus (107%), flexural strength (98%), flexural modulus (104%) and impact resistance (24%). The inclusion of CaCO3 nanoparticles, in the presence of 10 wt % HSCF, led to the noticeable improvements of tensile strength (128% for 2 wt % CaCO3), tensile modulus (199% for 5 wt % CaCO3), flexural strength (146% for 5 wt % CaCO3), flexural modulus (204% for 5 wt % CaCO3) and impact resistance (46% for 2 wt % CaCO3). The surface treatment of carbon fibers, dispersion conditions of nanoparticles and ABS phase in polymeric matrix were found to be the major important factors affecting the mechanical properties. 相似文献
13.
The potential of trichloroisocyanuric acid (TCCA) as a chlorination agent for efficient conversion of Si-H functional silanes and siloxanes to the corresponding Si-Cl functional moieties was explored. In comparison to methods using other chlorinating agents, TCCA is inexpensive, results in a much faster reaction and produces a high purity product with a conversion that is essentially quantitative. A variety of chloro derivatives of linear and cyclic structures have been synthesized from silicon hydrides using this reagent with impressive yields that typically exceed 90%: PhSiCl3 (97.5%); PhMeSiCl2 (95.5%); Ph3SiCl (97.5%); Vi3SiCl (98.7%); (EtO)3SiCl (99.7%); t-Bu3SiCl (∼100%); (MeClSiO)4 (86.5%); (MeClSiO)5 (95%); (MeClSiO)7 (96.5%); Ph(OEt)2SiCl (98%); ClMe2SiOSiMe2Cl (98.6%); ClMe2SiOSiMeClOSiMe2Cl (94.6%); ClMe2Si(OSiMeCl)2OSiMe2C l (92.3%); (Me3SiO)3SiCl (97%); Me3SiOSiClPhOSiMe3 (99%); Me3SiO(SiMeClO)3SiMe3 (95.7%); ClSi(OSiMe3)2OSi(OSiMe3) 2Cl (93.6%).For monohydridosilanes, dichloromethane (CH2Cl2) was a suitable solvent in which nearly quantitative conversion was observed within several minutes following the addition of the silanes to TCCA. For certain cyclic and linear siloxanes, and especially silanes containing multiple hydrogen atoms on the same silicon for which the reaction is sluggish in CH2Cl2, tetrahydrofuran (THF) was the preferred solvent. For a sterically demanding silane that did not undergo chlorination even in THF viz., HSi(OSiMe3)2O-Si(OSiMe3)2H, 1,2-dichloroethane was the best solvent. 相似文献
14.
Pascal André William Bussière David Rochette 《Plasma Chemistry and Plasma Processing》2007,27(4):381-403
Calculated values of viscosity, thermal and electrical conductivities of plasma formed in mixtures of silver (Ag) and silica
(SiO2) are presented. The calculations, which assume local thermodynamic equilibrium, are performed for three pressures (1, 10
and 30 atm) in the temperature range from 4,000 to 30,000 K. All the data for the potential interactions and the necessary
formulations to obtain values of transport coefficients are given in details. For atmospheric pressure, five mixtures (100%
Ag, 75% Ag and 25% SiO2, 50% Ag and 50% SiO2, 25% Ag and 75% SiO2, 100% SiO2) in weight percentage are studied. In order to analyse the pressure influence on the transport coefficients, three samples
of Ag–SiO2 mixtures (100% Ag, 50% Ag and 50% SiO2, 100% SiO2) in weight percentage are discussed for pressures of 1, 10 and 30 atm. In addition for the test case of oxygen plasma, we
compare the computation code results with values obtained by other authors: discrepancies are found and explained.
相似文献
15.
Ag3PW12O40 and Ag4SiW12O40 showed high activity and stability in the synthesis of diethylene glycol ethyl ether with diethylene glycol and ethanol, on which the conversion is 80.2% and 78.4%, respectively, and the selectivity of diethylene glycol ether is 75.4% and 80.6%, respectively. After the third reaction cycle, Ag3PW12O40 and Ag4SiW12O40) still showed higher activity and selectivity, on which the conversion is 72. 6% and 77.5% respectively. But the activity of Ag3PMo12O40 is lower, the conversion is only 21.0%. IR, XRD, TG and n‐butylamine titrimetry showed that the catalysis may be connected with two kinds of acidic centers owned by heteropoly acidic salt. 相似文献
16.
Frank M. Silver Frank Dobinson James S. Ridgway 《Journal of polymer science. Part A, Polymer chemistry》1978,16(9):2151-2157
Copoly(4,4′-oxanilideterephthalamide—4,4′-phenyleneterephthalamide) (A-202/PPD) was synthesized by reaction of 4,4′-diaminooxanilide, p-phenylenediamine, and terephthaloyl chloride in organic solvents. Copolymer inherent viscosities in H2SO4 as high as 10.3 were obtained. Isotropic copolymer solutions (4%—5% concentration) of A-202/40%–80% PPD were spun to fibers with tenacity/elongation/modulus at 1% extension in the 13–14 gpd/1.5%–2%/700–1000 gpd range. Oxamide and amide stabilities in 98–100% H2SO4 and 20% oleum were compared. Poly(4,4′-oxanilideterephthalamide) (A-202), A-202/PPD copolymers, and poly(4,4′-phenyleneterephthalamide) (PPT) were unstable in 20% oleum, but all proved relatively stable in 100% H2SO4. However, the oxamide linkage proved less stable than the amide linkage in 98% H2SO4. A-202 and A-202/PPD copolymers formed stable anisotropic spinning solutions in 1% oleum at 10–20% concentrations. Dynamic mechanical analyses (Vibron) showed no glass transition temperature (Tg) below 200°C. Dilatometric measurement of A-202/50% PPD revealed a Tg at 257°C. Differential thermal analyses of A-202/40–80% PPD exhibited endotherms at 470–480°C. Thermogravimetric analyses showed no significant weight loss below 400°C. 相似文献
17.
Zh. A. Kochkarov M. V. Khubaeva I. A. Shogenov Z. L. Khakulov 《Russian Journal of Inorganic Chemistry》2011,56(6):946-953
The phase diagrams of the NaBO2-NaCl-Na2CO3, NaBO2-Na2CO3-Na2MoO4, NaBO2- Na2CO3-Na2WO4, and NaBO2-NaCl-Na2WO4 ternary systems were studied by a calculation-experimental method and differential thermal analysis. The coordinates of ternary
eutectics were determined: E
1: 612°C, 16 mol % NaBO2, 42 mol % NaCl, and 42 mol % Na2CO3; E
2: 568°C, 12 mol % NaBO2, 28 mol % Na2CO3, and 60 mol % Na2MoO4; E
3: 575°C, 12 mol % NaBO2, 32 mol % Na2CO3, and 56 mol % Na2WO4; E
4: 628°C, 8 mol % NaBO2, 20 mol % NaCl, and 72 mol % Na2WO4; and E
5: 655°C, 9 mol % NaBO2, 53 mol % NaCl, and 38 mol % Na2WO4. 相似文献
18.
A. A. Firsova T. I. Khomenko O. N. Sil’chenkova V. N. Korchak 《Kinetics and Catalysis》2010,51(2):299-311
The catalytic activity of the CuO/ZrO2, CoO/ZrO2, Fe2O3/ZrO2, and CuO/(CoO, Fe2O3)/ZrO2 systems in the reaction of selective CO oxidation in the presence of hydrogen was studied at 20–450°C over the oxide concentration range of 2.5–10 wt % on the surface of ZrO2. The conversion of CO on the CoO/ZrO2 systems was almost independent of the concentration of CoO: 88 or 90% for 2.5 or 10% CoO, respectively. TPR data allowed us to relate the catalytic activity of CoO/ZrO2 to Co-O-Zr clusters, the amount of which was almost constant over the test range of CoO concentrations. The conversion of CO on 2.5% CuO/ZrO2 was 32% (190°C) or 62–66% on 5–10% CuO/ZrO2 (170°C). According to TPR data, clusters like Cu-O-Zr occurred on the surface of ZrO2, and the amount of these clusters reached a maximum upon supporting 5% CuO. The catalytic properties of 5% CuO/5% CoO/ZrO2 and 5% CoO/5% CuO/ZrO2 samples were identical to those of 5% CuO/ZrO2 samples. It is likely that the formation of active reaction sites upon consecutively supporting the oxides occurred on the same surface sites of ZrO2. In this case, Co and Cu oxides competed for cluster formation, and the copper cation can displace the cobalt cation from the formed clusters. The Fe2O3 samples were inactive; a maximum conversion of 34% (290°C) was observed on 10% Fe2O3/ZrO2. The catalytic properties of CuO/Fe2O3/ZrO2 were also identical to those of CuO/ZrO2, and they depended on the presence of Cu-O-Zr clusters on the surface. 相似文献
19.
Microwave-assisted extraction of ginsenosides from ginseng root 总被引:2,自引:0,他引:2
The extractions of ginsenosides Rg1 and Rb1 from ginseng root under atmospheric pressure by focused microwave-assisted technique have been investigated. The parameters used for the optimization were solvent composition, extraction time, and applied microwave power. The ginsenosides were quantified by high-performance liquid chromatography equipped with UV/Vis detector. The results of the 15-min microwave-assisted extraction (0.28% of Rg1 obtained in 70% water-ethanol and 1.31% of Rb1 obtained in 30% water-ethanol under 150 W of microwave power) were better than that from 10-h conventional solvent extraction (0.22% of Rg1 and 0.87% of Rb1 obtained in 70% water-ethanol). 相似文献
20.
E. V. Zolotukhina T. V. Gubanova I. K. Garkushin 《Russian Journal of Inorganic Chemistry》2013,58(7):858-860
Phase equilibria in the Li, K‖Br, VO3 ternary mutual system were studied by differential thermal analysis. The composition square of the ternary mutual system is divided into two phase triangles, LiVO3-KBr-KVO3 and LiBr-LiVO3-KBr. The ternary eutectics E 1 at 331°C and E 2 at 330°C have the compositions 40.0 mol % LiVO3, 6.0 mol % KBr, 54.0 mol % KVO3 and 58.0 mol % LiBr, 3.2 mol % LiVO3, 38.8 mol % KBr, respectively. The fields of phases crystallizing in the system were delimited. 相似文献