共查询到20条相似文献,搜索用时 765 毫秒
1.
Sokolov I. A. Valova N. A. Tarlakov Yu. P. Pronkin A. A. 《Russian Journal of Applied Chemistry》2003,76(5):745-750
The temperature and concentration dependences of the electrical conductivity was studied in Li2S-LiPO3 glasses. The effect of lithium sulfide additions (22.5-25 mol %) to LiPO3 on the electrical conductivity was studied. The nature of the conductivity was studied over the whole range of Li2S concentrations using Tubandt's procedure, and the contribution of electronic component to the total electrical conductivity was examined by Liang-Wagner's polarization method. 相似文献
2.
I. K. Garkushin M. A. Demina E. M. Bekhtereva 《Russian Journal of Inorganic Chemistry》2014,59(3):259-267
The quinary reciprocal system Li,K‖F,Cl,Br,MoO4 was partitioned into simplexes using graph theory. A tree of phases of the system was constructed, and stable elements were identified. The chemical interaction in the system Li,K‖F,Cl,Br,MoO4 was described by the ion balance method. The stable tetrahedra LiF-KCl-KBr-K2MoO4, LiF-KCl-KBr-LiKMoO4, and LiF-Li2MoO4-KCl-KBr and the united stable pentatope LiF-KF-KCl-KBr-K2MoO4 were studied by differential thermal analysis, and phase states in the studied simplexes were determined. The compositions of crystallizing phases in the bulk of the studied tetrahedra and pentatope were confirmed by X-ray powder diffraction analysis. 相似文献
3.
4.
E. V. Velichko Z. A. Mikhailovskaya M. V. Morozova E. S. Buyanova Yu. V. Emel’yanova S. A. Petrova V. M. Zhukovskii 《Russian Journal of Electrochemistry》2011,47(5):563-568
The results of our studies of solid solutions of the general composition Bi4V2 − x
Fe
x/2Cr
x/2O11 − δ are presented. The crystal-chemical parameters of different polymorphic modifications of BIMEVOX were determined. The particle
size distribution was determined by laser diffraction and optical microscopy. The surface of sintered preforms was studied
by scanning electron microscopy. The conductivity of sintered poly-crystalline samples as a function of temperature and composition
was studied by impedance spectroscopy. The conductivity was depends on the procedure for the synthesis of solid solutions.
The most promising compositions were revealed. 相似文献
5.
The azine bridged dicatechol ligand (E,E)-benzaldehyde azine (H4L) was fully characterized by X-ray analysis. The reaction of [ReCl6]2− with this compound was studied and the novel Re(IV) complex (HNEt3)(NBu4)[ReCl4(H2L)] was prepared and characterized. The structure and spectroscopy of the compound H4L and its Re(IV) complex were studied experimentally and by means of density functional calculations. 相似文献
6.
The possibility to synthesize M1x M2(OH) y F z nanolayers by the ionic layering method with the use of soluble anionic complexes of metal fluorides was demonstrated. The influence of the concentration and pH of reagent solutions and of the number of ionic layering cycles on the kinetics of layer growth was studied using the example of Cu x Zr(OH) y F z layers. The composition of the synthesized layers was studied by X-ray photoelectron (XPE) spectroscopy, ellipsometry, and electronic and Fourier transform IR (FT-IR) transmission spectroscopy. 相似文献
7.
V. A. Logvinenko A. V. Belyaev S. N. Vorob’eva 《Journal of Thermal Analysis and Calorimetry》2013,114(3):1177-1181
The dehydration of the rhodium salt [Rh(H2O)6]2(SO4)3·5H2O was studied by means of thermogravimetry in the temperature range 300–460 K. The kinetics of dehydration (the ligand substitution process) was studied under non-isothermal conditions. A model-free method was used to calculate the activation energy and analyze the process steps; a non-linear regression method was applied to calculate the kinetic parameters of the multistage dehydration reactions. The features of the dehydration kinetics could be explained by the condensation process. 相似文献
8.
Shujuan Zhang Landong Li Bin Xue Jixin Chen Naijia Guan Fuxiang Zhang 《Reaction Kinetics and Catalysis Letters》2006,89(1):81-87
Summary The SCR of NO by propane in excess oxygen was studied on a Ni-Al2O3 catalyst prepared by a coprecipitation method. The effect of Ni loading on the catalytic performance was studied and the optimal
Ni loading was found to be 4 % (wt.%). Based on characterization results, highly dispersed nickel species in surface aluminate
phase was regarded as the active site for NO reduction by C3H8 and NiO phase was the active site for C3H8 oxidation by oxygen. 相似文献
9.
V. Mirkhani M. Moghadam S. Tangestaninejad B. Bahramian 《Journal of the Iranian Chemical Society》2008,5(3):375-383
The catalytic activity of Mn(salen)Cl containing tert-pentyl groups at the 3,5-positions of the salen ligand in the epoxidation of alkenes and hydroxylation of alkanes was studied at room temperature, using sodium periodate as an oxygen source. The effects of various axial ligands were investigated in the epoxidation of cyclooctene. Imidazole, as a strong π-donor ligand, was the best axial ligand. The effect of different solvents was studied in the epoxidation of cyclooctene in CH3CN/H2O solvent mixture. The epoxidation reactions of cyclooctene by different oxygen donors including NaIO4, Bu4NIO4, KHSO5, H2O2, H2O2/urea, NaOCl and tert-BuOOH were also studied and NaIO4 was selected as oxygen source. The presence of bulky substituents in the 3,5-positions of the salen ligand was found to increase the catalytic activity of this complex. 相似文献
10.
A. A. Ostroushko M. O. Tonkushina A. P. Safronov V. Yu. Korotaev V. A. Vazhenin V. Yu. Kolosov N. A. Martynova I. B. Kutyashev S. G. Bogdanov A. N. Pirogov K. B. Grzhegorzhevskii A. V. Prokof’eva 《Russian Journal of Inorganic Chemistry》2012,57(6):858-863
Samples of polyoxometalate Mo72Fe30: [Mo72Fe30O252(CH3COO)12{Mo2O7(H2O)}2 {H2Mo2O8(H2O)}(H2O)91] · ??150H2O with a buckyball structure, which can be both crystalline and amorphous, were synthesized. It was shown that such samples can be studied by neutron diffraction. The stability of Mo72Fe30 to heating and UV light exposure (in poly(vinyl alcohol) and polyvinylpyrrolidone films) was studied by IR, EPR, and electronic absorption spectroscopy; thermal analysis; and mass spectrometry. Mo72Fe30 was found to be less stable to heating and irradiation in a poly(vinyl alcohol) film as compared with the related polyoxometallate Mo132 free of iron. The sorption properties of Mo72Fe30 to organic vapors and its stability under sorption conditions were studied. It was demonstrated that, in addition to sorption, organic substances cause the destruction of buckyballs. 相似文献
11.
Crude enzyme extracted from soybean was used to convert isoeugenol into vanillin. The effects of several factors on the bioconversion
were studied. Conversion was affected by the armount of substrate and was also improved by the addition of absorbents, among
which powdered activated carbon was the best. The effect of H2O2 concentration on the conversion was also studied. The optimum concentration of H2O2 was 1% (v/v). With 10 g/L of powdered activated carbon and 0.1% H2O2 added, vanillin reached a maximum concentration of 2.46 g/L after 36 h, corresponding to a molar yield of 13.3%. 相似文献
12.
Liquid phase Friedel‐Crafts alkylation of benzene with benzyl chloride was carried out over various ferrites viz. CuFe2O4, NiFe2O4, CoFe2O4, ZnFe2O4, and MgFe2O4. Among the various ferrites ZnFe2O4 showed the highest activity. These ferrites were prepared by co‐precipitation technique. The effect of variation of catalyst, speed of agitation and reaction temperature has been studied. Benzylation of other substrates such as toluene, anisole and chlorobenzene was also studied. The catalyst ZnFe2O4 was found to be reusable. The acid base properties of the catalyst were studied by cyclohexanol dehydration reaction and the data was correlated with activity. 相似文献
13.
B. Yu. Gamataeva R. M. Bagomedova A. M. Gasanaliev 《Russian Journal of Inorganic Chemistry》2014,59(2):134-140
The Li,Na,K‖NO2,NO3 quaternary reciprocal system was differentiated by partitioning the n-dimensional composition diagrams of systems with complexation using incidence matrices and graphs. The constructed tree of phases was confirmed by X-ray powder diffraction analysis. The quaternary system LiNO2-NaNO2-KNO2-KNO3, which is a stable partitioning tetrahedron of the quaternary reciprocal system Li,Na,K‖NO2,NO3, was studied for the first time by differential thermal and visual polythermal analyses and the projection-thermographic method. The phase state diagram of the studied system was constructed using experimental data. 相似文献
14.
M. Zh. Zhumaniyazov B. M. Beglov O. F. Khodzhaev N. Kh. Yuldashev 《Russian Journal of General Chemistry》2004,74(7):1001-1004
The solubility polytherm of the ternary system hexamethylenetetramineammonium dihydrogen phosphate-water was studied in a wide temperature range. The concentration and temperature ranges of crystallization of the starting components and a new compound, NH4H2PO4·2(CH2)6N4·8H2O, were determined. The properties and structure of the new compound were studied by X-ray phase, thermal, and IR spectroscopic analyses. 相似文献
15.
V. G. Sevastyanov E. P. Simonenko D. V. Sevastyanov N. P. Simonenko V. L. Stolyarova S. I. Lopatin N. T. Kuznetsov 《Russian Journal of Inorganic Chemistry》2013,58(1):1-8
Ultrafine Nd2Hf2O7 powders with the pyrochlore structure are prepared by self-propagating hightemperature synthesis (in the Pechini version). The elemental and phase composition of the powder are studied. Microstructure is studied by scanning electron microscopy. BET specific surface areas are determined. Thermal behavior is studied by TGA/DSC/DTA up to 1473 K. The sintering kinetics of as-synthesized Nd2Hf2O7 powder at various temperatures is studied. Nd2Hf2O7 vaporization in the range 2400–2600 K is studied by Knudsen effusion/mass spectrometry, and the thermodynamic characteristics of this compound are determined. 相似文献
16.
Mirjana
ili Aia Sendijarevi Vahid Sendijarevi Kurt C. Frisch 《Journal of polymer science. Part A, Polymer chemistry》1989,27(6):1843-1851
The reaction of cyclohexyl isocyanate with phenylglycidyl ether was selected as model reaction for the synthesis of cycloaliphatic isocyanate-based poly(2-oxazolidone)s. The selectivity of AlCl3 and AlCl3-triphenylphosphine oxide (AlCl3–TPPO) and AlCl3-hexamethylphosphoric triamide (AlCl3–HMPA) complexes was studied for 2-oxazolidone formation. The reaction products were identified by means of the melting point, 1H-NMR, and IR spectroscopy. The kinetics of the model reaction was studied using AlCl3-TPPO in o-dichlorobenzene at 120 and 140°C. 相似文献
17.
B. A. Ananchenko L. A. Kalinina Yu. N. Ushakova E. V. Koshurnikova 《Russian Journal of Electrochemistry》2013,49(8):763-768
Solid solutions of Yb2S3 based on CaYb2S4 (Yb3S4) were prepared by the ceramic and sol-gel methods. The samples were identified by XRD. The electric conductivity of complex sulfide phases with different backgrounds was studied. The length of phases based on CaYb2S4 was determined. The thermal stability of the samples was tested and the range of working temperatures was determined. 相似文献
18.
M. Gawlicki 《Journal of Thermal Analysis and Calorimetry》1995,45(4):823-828
The hydration of β-Ca2SiO4 stabilized by thermal treatment and barium addition was studied in CaCl2, Ca(NO3)2 and BaCl2 solutions. The heat evolution kinetics was followed by calorimetry. A considerable acceleration of the hydration process was found in the presence of electrolytes. The positive influence of barium ions was confirmed. The highest total heat output during the 3-day hydration was found for samples doped with 3 mole % BaO. 相似文献
19.
M. S. Chernov’yants I. V. Burykin Z. A. Starikova A. A. Rostovskaya 《Russian Journal of Inorganic Chemistry》2012,57(2):193-196
A new salt diphenyliodonium triiodide (C12H10I4) was obtained. The [C12H10I+][I3−] compound was isolated as red brown crystals and studied by single-crystal X-ray diffraction. The structure of diphenyliodonium
triiodide consists of separate, virtually linear I3− anions and C12H10I+ cations. Strong intermolecular anion-anion (I3−…I3−) and anion-cation (I3−…I+) interactions in the crystal structure leads to a change in the symmetry of triiodide ions. The complex formation in the
system organic cation iodide-elementary iodine was studied by spectrophotometry. The complex composition was found (1: 1),
and the stability constant of the complex in chloroform was determined (loggB = 3.91). 相似文献
20.
B. T. Usubaliev F. B. Alieva A. L. Shabanov F. T. Murvatov M. K. Munshieva F. F. Dzhalaladdinov P. S. Safarova Z. A. Mamedova 《Russian Journal of General Chemistry》2015,85(6):1467-1469
An iron(III) complex of terephthalic acid of the general formula Fe2[C6H4(COO)2]3(H2O)4.was synthesized. The composition and structure of the complex were studied by X-ray phase analysis and IR spectroscopy. The thermal stability of the complex was studied in the range 20–900°C. It was shown that doping with a Fe2[C6H4(COO)2]3(H2O)4 reagent improves the rheological properties of heavy oil. 相似文献