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1.

Вид документа : Статья из журнала
Шифр издания : 54/E 27
Автор(ы) : Gyrdasova O. I., Krasil'nikov V. N., Grigorov I. G., Bazuev G. V.
Заглавие : Effect of Ethylene Glycol on the Formation of Extended Crystals of M1/3Co2/3C2O4(M = Zn, Mn) Oxalates and Their Thermolysis Products
Место публикации : Russian Journal of Inorganic Chemistry. - 2006. - Vol. 51, № 6. - С. 949-955: il.
Примечания : Bibliogr. : p. 954-955 (19 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): этиленгликоль--оксалаты--термолиз--цинк--марганец
Аннотация: The effect of ethylene glycol (EG) on the formation of whiskers and fibers of complex oxides with the general formula MCo2O4 upon the thermolysis of M1/3Co2/3C2O4(M = Zn, Mn) oxalates has been studied. New compounds (solvates) are formed when powdered oxalates are heated with EG. In the solvates, EG molecules substitute for water molecules according to the reaction M1/3Co2/3C2O4· 2H2O + HOCH2CH2OH =M1/3Co2/3C2O4(HOCH2CH2OH) + 2H2O. The solvates have been characterized using X-ray powder diffraction, microscopy, IR spectroscopy, thermogravimetry, and chemical analysis. The shape, structure, and particle size of the thermolysis products of EG-modified oxalates have been determined using scanning electron microscopy
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2.

Вид документа :
Шифр издания : 54/I-76
Автор(ы) : Volkov V. L., Kadyrova N. I., Zakharova G. S., Kuznetsov M. V., Podval'naya N. V., Mikhalev K. N., Zainulin Yu. G.
Заглавие : Ion State of Atoms and the Properties of Perovskite-Like Compound CaCu3V4O12
Место публикации : Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 3. - С. 329-333: il.
Примечания : Bibliogr. : p. 333 (16 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): перовскитоподобные соединения--стехиометрия
Аннотация: The binding energies and valence state of atoms in the perovskite-like compound CaCu3V4O12 have been determined using XPS spectroscopy. The stoichiometry of this phase is formulated as Ca2+Cu2+(V2(5+)V2(4+)O12). Under an air atmosphere, the phase interacts with water vapor and oxygen. As a result, Ca(OH)2 is formed on its surface, the Cu+ and V4+ ion concentrations decrease, and the Cu2+ and V5+ concentrations increase in association. Raman spectra show shortened cation–anion bond lengths and cation–anion–cation bond angles in CaCu3V4O12 compared to perovskite CuVO3; the two structures are alike. The electrical conductivity, magnetic susceptibility, thermal and sensor properties of CaCu3V4O12 in aqueous salt solutions have been studied
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3.

Вид документа :
Шифр издания : 54/K 81
Автор(ы) : Krasil'nikov V. N.
Заглавие : Phase Ratios in the M2O–V2O5–SO3 (M = Rb, Cs) Systems and the Properties of the Compounds Formed in These Systems
Место публикации : Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 3. - С. 419-423: il.
Примечания : Bibliogr. : p. 423 (21 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): оксидные системы--порошковая дифракция--щелочные металлы
Аннотация: Powder X-ray diffraction and microscopy have been used to study phase ratios of the M2O–V2O5–SO3 (M = Rb, Cs) systems, which model the active component of rubidium–vanadium and cesium–vanadium catalysts for sulfuric acid production at high sulfur dioxide conversions. We have stated that each system forms four compounds: M3VO2(SO4)2, MVO2SO4, M4V2O3(SO4)4, and MVO(SO4)2. The thermal properties of these compounds and their interaction with water vapor saturated at room temperature have been studied. The unit cell parameters have been determined for the compounds MVO2SO4 (M = K, Rb), MVO(SO4)2, and M[VO2(SO4)(H2O)2] · H2O (M = Rb, Tl). The reciprocal transformations of the components and phases of the M2O–V2O5–SO3 systems match the Lux–Flood ideas of the acid–base properties of oxide compounds
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4.

Вид документа : Статья из журнала
Шифр издания : 54/K 46
Автор(ы) : Lopushan V. I., Kuznetsov G. F, Pletnev R. N., Kleshev D. G.
Заглавие : Kinetics of phase transitions of gibbsite during heat treatment in air and in water vapor
Место публикации : Refractories and Industrial Ceramics. - 2007. - Vol. 48, № 5. - С. 378-382: il.
Примечания : Bibliogr. : p. 382 (11 ref.)
ISSN: 1083-4877
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): фазовые переходы--гиббсит--обработка термическая
Аннотация: Results are provided for a study of the kinetics and mechanism of phase transitions (PT) of gibbsite during heat treatment in air and in water vapor (in the range 170 – 550°C) by iso- and non-isothermal thermogravimetry, x-ray-phase analysis (XPA), transmission electron microscopy (TEM), nuclear magnetic resonance in 27Al nuclei (NMR27Al), and chemical analysis. It is shown that PT of gibbsite in air there are two interconnected transitions that occur in parallel: gibbsite → boehmite (γ-AlOOH) and gibbsite → x-ray amorphous Al2O3 that are realized by a topochemical mechanism. In water vapor gibbsite only experiences transition to boehmite (PT-3) that occurs by a dissolution – precipitation mechanism. Apparent activation energies for the PT that occur are determined
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5.

Вид документа : Статья из журнала
Шифр издания : 54/C 70
Автор(ы) : Polyakov E. V., Emel'yanova N. N., Surikov V. T., Ilves G. N.
Заглавие : Colloidal Chemical Extraction of Calcium Sulfate and Sorption of Microcomponents of Fresh Water on Calcium Sulfate
Место публикации : Radiochemistry. - 2003. - Vol. 45, № 1. - С. 47-50: il.
Примечания : Bibliogr. : p. 50 (18 ref.)
ISSN: 1066-3622
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): сульфат кальция--сорбция--коллоидно-химическая экстракция
Аннотация: Experimental data on colloidal chemical extraction of calcium sulfate formed in supersaturated solutions in fresh water are discussed. When the product of activities of calcium and sulfate ions is artificially exceeded, a nonequilibrium phase with the solubility close to that of CaSO4 is formed. This phase is extracted into a paraffin melt. Colloidal-chemical extraction of calcium sulfate with paraffin melt and sorption of microcomponents (single-, double-, and triple-charged cations) on calcium sulfate precipitates were studied. The precipitate has high affinity for cesium traces (Kd ~10(3) mg g1) in supersaturated solutions. Some cation species are not sorbed on the precipitate
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6.

Вид документа : Статья из журнала
Шифр издания : 54/P 80
Автор(ы) : Polyakov E. V., Ilves G. N., Surikov V. T.
Заглавие : Determination of Ionic to Colloid Form Ratio Chemical Extraction
Место публикации : Radiochemistry. - 2003. - Vol. 45, № 5. - С. 506-511: il.
Примечания : Bibliogr. : p. 510-511 (47 ref.)
ISSN: 1066-3622
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): коллоидно-химическая экстракция--микрокомпоненты--радиоактивные элементы
Аннотация: Colloid forms of a series of microcomponents were studied in aqueous solutions by the colloidal chemical extraction method in combination with ICP MS. The potential of this combined method for determination of the total fraction of the colloid species and distribution of microcomponents of stable and radioactive elements throughout colloid forms at their natural abundance in potable water is examined
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7.

Вид документа : Статья из журнала
Шифр издания : 54/P 80
Автор(ы) : Polyakov E. V.
Заглавие : Behavior of Ionic and Colloid Forms of Microelements in Colloidal Chemical Extraction from Humic Acid Solutions
Место публикации : Radiochemistry. - 2007. - Vol. 49, № 4. - С. 432-438: il.
Примечания : Bibliogr. : p. 437-438 (44 ref.)
ISSN: 1066-3622
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): коллоидно-химическая экстракция--гуминовая кислота--растворы--микроэлементы
Аннотация: Speciation and extractability of humic acids (HAs) and humate complexes of microelements are studied using the colloidal chemical extraction method in combination with ICP MS with an example of natural mineral water with high HA concentration (800 -1200 mg l(1) collected from the Salekhard region. Joint extraction behavior of ionic and colloid forms of anionic and cationic species of a large number of microelements, including U(VI) and Th(IV), and HAs is examined at their natural abundance in mineral water, as influenced by pH and HA concentration. Humic acids proved to behave in natural water as a pool of ioncolloidal species, whose protonation results in precipitation at pH 2.0 -3.5. In this case, some chemical elements are sorbed on the resulting solid and may be separated along with HAs by colloidal chemical extraction into isobutanol. In natural humate solutions, a considerable fraction (10 -99 mol %) of chemical elements is associated with HAs in the form of colloid species extractable with isobutanol
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8.

Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Krasil'nikov V. N., Shtin A. P., Gyrdasova O. I., Polyakov E. V., Shveikin G. P.
Заглавие : Synthesis and Properties of Titanium Glycolate Ti(OCH2CH2O)2
Место публикации : Russian Journal of Inorganic Chemistry. - 2008. - Vol. 53, № 7. - С. 1065-1069: il.
Примечания : Bibliogr. : p. 1069 (21 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): гликолят титана--диоксид титана--нанотехнологии
Аннотация: A new efficient method for the synthesis of extended micro- and nano-sized crystals (whiskers, fibers) of titanium glycolate Ti(OCH2CH2O)2 has been suggested. The method implies the reaction of hydrated titanium dioxide with ethylene glycol on heating in air. Thermolysis of Ti(OCH2CH2O)2 in air gives titanium dioxide as anatase (400–500°C) and rutile (T 700°C), the morphology of titanium glycolate crystals being inherited by the oxide. The pseudocrystals of the thermolysis product in an inert gas medium (T=500–950°C) represent aglomeration of nano-sized titanium dioxide particles and amorphous carbon. At temperatures up to 1300°C, the formation of the TiO2–xCx phase with a rutile structure is probable. In a wet air environment, titanium glycolate is partially hydrolyzed to give TiOx(OCH2CH2O)2–2x(OH)2x·xH2O(0≤x≤1) and on keeping in water at room temperature, ethylene glycol is completely displaced from the crystals. This process is also not accompanied by changes in the particle morphology
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9.

Вид документа : Статья из журнала
Шифр издания : 54/A 53
Автор(ы) : Minibaev R. F., Zhuravlev N. A., Bagatur’yantz A. A., Alfimov M. V.
Заглавие : An investigation into adsorption of simple organic and inorganic molecules on a silica gel surface
Место публикации : Russian Physics Journal. - 2009. - Vol. 52, № 11. - С. 1164-1169: il.
Примечания : Bibliogr. : p. 1169 (11 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): силикагели--поверхности--адсорбция
Аннотация: Adsorption of simple organic and inorganic molecules on an amorphized silica gel surface is studied within the framework of density functional theory in the approximation of periodic crystalline slabs. Adsorption of water, ammonia, acetone, and ethanol molecules is examined. Most probable adsorption sites of molecules on the surface are calculated and the adsorption energies and bond lengths of molecules on the silica gel surface are estimated
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10.

Вид документа : Статья из журнала
Шифр издания : 54/R 42
Автор(ы) : Linnikov O. , Rodina I., Shevchenko V., Medvedeva I., Uimin M. , Schegoleva N., Yermakov A., Platonov V., Osipov V.
Заглавие : Removal Of CR(VI) from aqueous solutions by magnetite nanoparticles with different sizes and crystal structure
Место публикации : Desalination and Water Treatment . - 2014. - Vol. 52, № 1-3. - С. 324-330
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): наночастицы--структура кристаллическая
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11.

Вид документа : Статья из журнала
Шифр издания : 54/P 84
Автор(ы) : Popov N. A., Akashev L. A., Kochedykov V. A.
Заглавие : Ellipsometric and IR spectroscopic study of the surface interaction of binary Al-REM alloys with water
Место публикации : Russian Journal of Physical Chemistry A. - 2013. - Vol. 87, № 11. - С. 1902-1904
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): ик эллипсометрии--спектроскопии--коробка передач
Аннотация: The effect of Al-REM binary alloys’ composition on the kinetics of their surface oxidation by water is studied by means of ellipsometry and IR spectroscopy. Intermetallides with ∼21 at % rare-earth metal in aluminum are oxidized in distilled water at 100°C, along with alloys of eutectic composition (Al-∼2 at % REM) in solid and disperse state. It is found that the kinetic dependences of the thickness of films formed on pollycrystalline alloy samples and the IR transmission spectra of dispersed samples show that increasing the quantity of dopant REM in aluminum lowers the reactive capability of aluminum under certain conditions. It is found that the experimental ellipsometric results are described by a two-layer model consisting of a substrate, an inner oxide layer and an outer layer of hydroxide.
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12.

Вид документа : Статья из журнала
Шифр издания : 54/H 99
Автор(ы) : Animitsa I. E., Kochetova N. A., Denisova T. A., Zhuravlev N. A., Baklanova I. V.
Заглавие : Hydration and Proton Transport in Solid Solutions Based on Ba2CaWO6
Место публикации : Russian Journal of Physical Chemistry A. - 2009. - Vol. 83, № 2. - С. 197-202: il.
Примечания : Bibliogr. : p. 201 (12 ref.)
ISSN: 0036-0244
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): гидратация--протонный перенос--твердые растворы--вольфраматы щелочноземельных металлов
Аннотация: Hydrated alkaline-earth metal tungstates Ba4Ca2 +xW2 –xO12 – 2x with perovskite structure were studied by the thermogravimetry, 1H NMR, IR, and Raman spectroscopy methods. Electrical conductivity and transfer numbers were measured with varying T, Po2, and PH2O. The solid solutions are capable of reversibly intercalating water and can exhibit high-temperature proton transport. The localization of protons on oxygen results in the appearance of energetically nonequivalent OH groups; a small fraction of protons are present in the form of H2O and H3O+
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13.

Вид документа : Статья из журнала
Шифр издания : 54/K 81
Автор(ы) : Krasil'nikov V. N., Gyrdasova O. I., Bazuev G. V.
Заглавие : Ethylene Glycol-Modified Cobalt and Iron Oxalates As Precursors for the Synthesis of Oxides As Extended Microsized and Nanosized Objects
Место публикации : Russian Journal of Inorganic Chemistry. - 2008. - Vol. 53, № 12. - С. 1854-1861: il.
Примечания : Bibliogr. : p. 1860-1861 (18 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): этиленгликоль--кобальт--оксиды--оксалат железа
Аннотация: The reactions of ethylene glycol with iron and cobalt oxalates upon heating in air are reported. Heat treatment of mixtures of oxalate powders with ethylene glycol yields new compounds (solvates) via the replacement of the water molecules in the oxalate structure by ethylene glycol molecules: MC2O4·2H2O+HOCH2CH2OH=MC2O4(HOCH2CH2OH)+2H2O↑. The crystals resulting from this reaction are elongated, and their shape is inherited by their thermolysis products. Thermolysis in air yields microwhiskers and nanowhiskers of Fe2O3and Co3O4, and thermolysis in an inert atmosphere affords Fe3O4and Co whiskers. The thermolysis of FeC2O4(HOCH2CH2OH) in helium yields a new structural modification of FeC2O4 as an intermediate product. The resulting compounds and their thermolysis products were characterized by X-ray powder diffraction, microscopy, IR spectroscopy, and thermogravimetric and chemical analyses. The particle shape and size were determined by scanning electron microscopy
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14.

Вид документа : Статья из журнала
Шифр издания : 54/G 99
Автор(ы) : Gyrdasova O. I., Krasil'nikov V. N., Bazuev G. V.
Заглавие : Synthesis of Micro- and Nanosized Manganese Oxides from Hydrated Manganese Oxalates and Products of Their Chemical Modification with Ethylene Glycol
Место публикации : Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 7. - С. 1035-1040: il.
Примечания : Bibliogr. : p. 1040 (9 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): оксид марганца--оксалаты--этиленгликоль
Аннотация: The reactions of ethylene glycol with manganese oxalates MnC2O4·2H2O and MnC2O4·3H2O on heating in air were studied. At temperature below 100°C, ethylene glycol was found to displace water from oxalates to give a new solvate compound according to the reaction MnC2O4·nH2O+HOCH2CH2OH=MnC2O4(HOCH2CH2OH) +nH2O↑. The crystals of the solvates retain the morphology of the initial oxalates, which is then inherited by the products of their thermolysis. Thus, thermolysis of MnC2O4·3H2O and MnC2O4(HOCH2CH2OH) having quasi-unidimensional structure gave Mn3O4 and Mn2O3nanowhiskers in air and MnO in an inert gas environment. Heating of MnC2O4·nH2O in ethylene glycol at temperatures above 100°C results in anhydrous manganese oxalate
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15.

Вид документа : Статья из журнала
Шифр издания : 54/A 58
Автор(ы) : Animitsa I. E., Dogodaeva E. N., Zabolotskaya E. V.
Заглавие : Structure and Electrical Properties of Oxygen-Deficient Strontium Copper Niobate
Место публикации : Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 2. - С. 254-260: il.
Примечания : Bibliogr. : p. 260 (15 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): протонный перенос--ниобаты--стронций
Аннотация: The transport properties of Sr5.66Cu0.14Nb2.20O11.30 double perovskite, which enters the homogeneity region of (Sr1 – yCuy)6 – 2xNb2 + 2xO11 + 3x solid solution, are concerned. The total conductivity is differentiated into terms over wide ranges of temperatures and oxygen partial pressure pO2 in dry and humid atmospheres. When pO2 is low or high, a test sample has dominant electron transport of n- or p-type, respectively. In air (pO2 = 0.21 atm), the p-type electron conductivity term increases with temperature elevation. In a humid atmosphere ( pH2O= 0.02 atm), a sample is capable of a reversible incorporation of water occlusion from the gas phase; as a result, some proton conductivity term appears and ion transference numbers increase over a wide range of pO2 values
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16.

Вид документа : Статья из журнала
Шифр издания : 54/P 80
Автор(ы) : Polyakov E. V., Ilves G. N.
Заглавие : Effect of Inorganic Anions on the Physicochemical State of Radionuclides in Process Freshwater Basins at the Mayak Production Association
Место публикации : Radiochemistry. - 2001. - Vol. 43, № 5. - С. 532-539: il.
Примечания : Bibliogr. : p. 538-539 (28 ref.)
ISSN: 1066-3622
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): радионуклиды--сорбция
Аннотация: Published data on the speciation of microcomponents and radionuclides (calcium, strontium, plutonium, and americium) in the water and bottom sediments of selected process water basins at the Mayak Production Association were discussed in terms of the model of the sorption behavior of a sorbate existing in several forms. It was shown that distribution of calcium, 90Sr, and natural isotopes of strontium does not contradict the views on formation of Ca2+, CaSO4 0 , Sr2+, SrSO4 0 , Sr[SO4]2(2) ionic and molecular species and of colloidal sulfate (CaSO4 .2H2O) at selected sites of the water basin. By combining these factors it is possibleto explain the variation in the distribition coefficients of Ca, Sr, Pu, and Am in the water3bottom sedimentssystem in terms of the model of ion-exchange sorption in the presence of nonsorbable nonequilibrium colloid
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17.

Вид документа : Статья из журнала
Шифр издания : 54/Г 36
Автор(ы) : Чеботина М. Я., Поляков Е. В., Гусева В. П., Хлебников Н. А., Суриков В. Т.
Заглавие : Геохимическая роль фито- и зоопланктона в извлечении химических элементов из водной среды
Параллельн. заглавия :The Geochemical Role of Phyto- and Zooplankton in the Extraction of Chemical Elements from the Water Medium
Место публикации : Доклады Академии наук. - 2011. - Т. 439, № 5. - С. 677-679: граф.
Примечания : Библиогр.: с. 679 (11 назв.)
ISSN: 0869-5652
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): геохимия--фитопланктон--зоопланктон--среда водная
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18.

Вид документа : Статья из журнала
Шифр издания : 54/E 58
Автор(ы) : Enyashin A. N., Gemming S., Seifert G.
Заглавие : DNA-wrapped carbon nanotubes
Место публикации : Nanotechnology. - 2007. - V. 18, № 24. - С. P. 245702(10 pp.): il.
Примечания : Bibliogr. : p. 245702-10(47 ref.)
ISSN: 0957-4484
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нанотрубки углеродные--дезоксирибонуклеиновая кислота
Аннотация: The stability and electronic properties of complexes of single-walled carbon nanotubes wrapped by homopolymeric single-stranded DNA molecules (CNT@DNA) are considered using a quantum mechanical density-functional tight-binding method (DFTB). A phenomenological model of the CNT@DNA formation energy depending on the nanotube radii is developed,which shows that the decoration of a CNT by a few DNA chains leads to a high water solubility of CNT@DNA. Pyrimidine-based DNAs are found to be more effective to wrap the CNTs than other DNAs. The densities of states of the CNT@DNA complexes are close to the superposition of those of the ‘free’ components with some additional states below the Fermi level. The band gap in a hybrid CNT@DNA system is determined by the competition between the Fermi levels of the ‘free’ DNA and CNT. In a few specific cases a considerable charge transfer from the DNA to the CNT was observed, combined with an additional gain in the CNT@DNA formation energy
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19.

Вид документа :
Шифр издания : 54/Y 95
Автор(ы) : Yuryeva E. I., Zhuravlev N. A., Pletnev R. N.
Заглавие : Xalfa Discrete Variational Analysis and Resonance Study of the Dissociation of Water Molecules on the Surface of TiO and TiO2 Oxides
Место публикации : Bulletin of the Russian Academy of Sciences: Physics. - 2007. - Vol. 71, № 5. - С. P. 735-737: il.
Примечания : Bibliogr. : p. 737 (5 ref.)
ISSN: 1062-8738
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): ямр--ядерный магнитный резонанс--оксид титана
Аннотация: The disordered state of hydrogen in titanium oxyhydrate has been investigated by 1H nuclear magnetic resonance. The protonation of TiO and TiO2 oxides has been simulated by the Xα discrete variational method. It is established that an increase in the number of protons decreases the stability of coordination polyhedra of titanium atoms, while an increase in the O–H bond length enhances the ability of water molecules to dissociate
\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2007, V. 71, N 5, P. 735-737.pdf
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20.

Вид документа : Статья из журнала
Шифр издания : 54/Z 19
Автор(ы) : Zakharova G. S., Volkov V. L.
Заглавие : Synthesis and Properties of the Mixed Hydrated Oxides V2-yWyO5+delta·nH2O
Место публикации : Journal of Sol-Gel Science and Technology. - 2005. - Vol. 34, № 3. - С. 293-298
Примечания : Библиогр. : с. 298 (18 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): оксид вольфрама--оксид ванадия--золь-гель метод--тонкие пленки--фотоэлектронные спектры--проводимость
Аннотация: Compounds of the general formula V2−yWyO5+δ ·nH2O (0 y ≤ 0.25) with the layered structure of polyvanadic acid V2O5·nH2O (H2V12O31−δ ·nH2O) have been prepared from peroxide solutions using the sol–gel process. The samples contain up to 5–8 wt% vanadium (IV). The water content changes within the range of 0.7 ≤ n ≤ 1.5 in depending on tungsten concentration. The V2−yWyO5+δ ·nH2O (y ≤ 0.125) form the thin films described an interlayer distance of 11.60 ± 0.05 A° . The thermal properties, IR, and X-ray photoelectron spectra of the compounds synthesized have been studied. The thermal stability of the phases increases with the rising of tungsten content. The dehydration finishes with the forming solid solution V2−yWyO5 and WO3. The electrical conductivity of V2−yWyO5+δ ·nH2O (0 y ≤ 0.25) powders was measured between 293 and 473 K at a relative humidity of 12%. The activation energy of conduction is independent upon theWcontent and equals 0.22–0.24 eV. Partial substitution of vanadium for tungsten was found to reduce the conductivity of the phases. The conductivity of the films increases with the increasing of relative air humidity and is governed by proton diffusion across the V O W layers
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