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1.
Инвентарный номер: нет.
   
   X 10


   
    X-ray Photoelectron Spectra and Electrical Properties of the K4.3V6O16.2 Polyvanadate / V. Bondarenka, V. L. Volkov, N. V. Podval'naya, S. Grebinskii, S. Mitskyavichyus, G. Tvardauskas // Inorganic Materials. - 2004. - Vol. 40, № 3. - P. 281-284 : il. - Bibliogr. : p. 284 (16 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РЕНТГЕНОВСКИЕ ФОТОЭЛЕКТРОННЫЕ СПЕКТРЫ -- СВОЙСТВА ЭЛЕКТРИЧЕСКИЕ -- ПОЛИВАНАДАТЫ КАЛИЯ
Аннотация: The valence state of vanadium atoms in polycrystalline K4.3V6O16.2 is studied by x-ray photoelectron spectroscopy. By decomposing the V2p3/2 peak into Gaussian components, the relative amounts of V5+, V4+, and V3+ ions in the polyvanadate are evaluated before and after Ar+ ion milling. The top surface layer of vacuum-sintered K4.3V6O16.2 is shown to be enriched in potassium and oxygen ions. The 288-K dielectric permittivity, carrier mobility, and carrier concentration are determined by complex-impedance measurements

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2.
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   V 86


    Volkova, E. G.
    Synthesis and Morphology of Nanodimensional Structures of Vanadium Oxide Doped with Lithium / E. G. Volkova, V. L. Volkov, N. V. Podval'naya // Inorganic Materials. Aplied Research. - 2010. - vol. 1, № 1. - P. 54-56 : il. - Bibliogr. : p. 56 (7 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОСТРУКТУРЫ -- СИНТЕЗ -- ВАНАДИЙ -- ЛИТИЙ
Аннотация: Nanodimensional powders of lithium-doped vanadium oxide of the formula Li0.4V2O5 · H2O are produced under hydrothermal conditions by the templateless synthesis method at 180°C from LiVO3–VOSO4–H2O solutions at pH = 3. The structure of the rods and the tubes formed by this method is examined by an electron microscopy method. The rods (up to 3 μm long and 25–50 nm in diameter) and the tubes (20–50 nm in outer and 2–6 nm in inner diameter) are oriented in the [010] direction. The distance between the layers is 10.30 ± 0.08 Å and 10.29 Å according to X-ray and electron diffraction data, respectively

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3.
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   V 86


    Volkov, V. L.
    Thermal expansion and electrical conductivity of M4±xV6O16±x (M = K, Rb, Cs) polyvanadates [Text] / V. L. Volkov, N. V. Podval'naya // Inorganic Materials. - 2008. - Vol. 44, № 2. - P176-180. - Библиогр.: с. 179-180 (11 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТЕРМИЧЕСКОЕ РАСШИРЕНИЕ -- ПОЛИВАНАДАТЫ -- ЭЛЕКТРОПРОВОДНОСТЬ -- СТЕХИОМЕТРИЯ
Аннотация: The thermal expansion coefficient of the M4±xV6O16±x(M = K, Rb, Cs) polyvanadates is a nonmonotonic function of temperature, with sharp minima at 663, 558, and 713 K, respectively, which are accompanied by no changes in cell symmetry (tetragonal) or a /c axial ratio. The polyvanadates are shown to be ionic–electronic conductors. The activation energy for electronic conduction in the three polyvanadates is 0.43±0.02eV. In the range 675–740 K, the conductivity of K4.2V6O16.2 shows metallic behavior. Rubidium polyvanadate has a narrower temperature range of unactivated conduction, and Cs3.8V6O15.8 has no such range. The conclusion is made that these phases undergo cation disordering due to deviations from the M4V6O16 stoichiometry

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4.
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   V 86


    Volkov, V. L.
    Phase Relations in the Li-V2O5-Cu System at 600°C and Cathodic Properties of CuxV2O5 [Text] / V. L. Volkov, B. G. Golovkin, N. V. Podval'naya // Inorganic Materials (Translation of Neorganicheskie Materialy). - 2004. - Vol. 40, № 11. - P1221-1223. - Библиогр. : с. 1223 (18 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
БРОНЗЫ ВАНАДИЕВЫЕ -- ФАЗОВЫЕ ОТНОШЕНИЯ -- ЛИТИЕВЫЕ ИСТОЧНИКИ ТОКА
Аннотация: The phase relations in the Li–V2O5–Cu system at 600°C are studied by x-ray diffraction. The existence of the known vanadium bronzes MxV2O5 (M = Li, Cu) is confirmed, and the composition ranges of the related solid solutions are determined. β-LixV2O5 (0.22 ≤ x ≤ 0.49) and γ-LixV2O5 (0.88 ≤ x ≤ 1.0) are shown to dissolve Cu, forming LixCuyV2O5 solid solutions with y = 0.72 – 1.48x and y = 0.58 – 0.18x, respectively. CuxLiyV2O5 solid solutions (y = 0.51 – 0.76 x) are only obtained from β-CuxV2O5 (0.24 ≤ x ≤ 0.67). β-LixV2O5 and β-CuxV2O5 form a continuous series of solid solutions. The cathodic properties of Li–V2O5–Cu materials in high-temperature pulsed lithium batteries are investigated

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5.
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   V 86


    Volkov, V. L.
    Phase Composition, Formation Parameters, and Morphology of Precipitates in the LiVO4-VOSO4-H2O System / V. L. Volkov, N. V. Podval'naya, E. G. Volkova // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 3. - P350-355 : il. - Bibliogr. : p. 354-355 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВАНАДИЯ -- ПОЛИВАНАДАТЫ
Аннотация: The phase and chemical compositions of the precipitates formed in the LiVO3–VOSO4–H2O system at initial pH within 1≤pH≤4 and 90°C were studied. The following phases were prepared: an α phase Li1.4(VO)1.3[H2V10O28]· nH2O and a β phase Li0.6 – xH1.4 + x[V12O31 – y/2] · nH2O (0 ≤ x ≤ 0.5, 1.3 ≤ y ≤ 2.0) with a layered structure. Li0.4V2O5 · H2O nanorods with the interlayer distance 10.30 ± 0.08 Å were synthesized at 180°C in an autoclave. The morphology, IR spectra, and main formation processes for these polyvanadates were studied

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6.
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   V 86


    Volkov, V. L.
    Electrical Conductivity of M2V12O30·nH2O (M = K, Rb, Cs) / V. L. Volkov, N. V. Podval'naya // Inorganic Materials. - 2004. - Vol. 40, № 11. - P. 1217-1220 : il. - Bibliogr. : p. 1220 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭЛЕКТРОПРОВОДНОСТЬ -- ПОЛИВАНАДАТЫ
Аннотация: The ac electrical conductivity of the M2V12O30·nH2O (M = K, Rb, Cs) polyvanadates prepared via hydrolytic precipitation is measured at 1 kHz between 298 and 423 K in air of 12% relative humidity. The 298-K conductivity of the samples is found to decrease with increasing cation size (in going from K to Rb and to Cs). The activation energy for conduction in the polyvanadates is 0.31–0.34 eV as determined during heating in the range 323–373 K and 0.20–0.23 eV above 373 K and during cooling. The activation energy is higher in Rb2V12O30· 6H2O. The 298-K ionic transference numbers inferred from dc conductivity measurements are 0.7,0.2, and 0.7 for K+, Rb+, and Cs+, respectively

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7.
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   V 18


   
    Valence state of atoms in the perovskite-like phase SrxCu3V4O12 (x = 0.67-1.0) and its properties [Text] / V. L. Volkov, N. I. Kadyrova, G. S. Zakharova, M. V. Kuznetsov, N. V. Podval'naya, K. N. Mikhalev, Yu. G. Zainulin // Inorganic Materials. - 2007. - Vol. 43, № 6. - P660-665 : il. - Библиогр. : с. 665 (7 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРОВСКИТОПОДОБНЫЕ ФАЗЫ -- ФОТОЭЛЕКТРОННАЯ СПЕКТРОСКОПИЯ -- ВАНАДИЙ
Аннотация: We report the first synthesis, at high pressure and temperature (p= 6.0–8.0 GPa, t= 1000°C), of SrxCu3V4O12(x= 0.67–1.0), a cation-deficient perovskite-like phase of variable composition (sp. gr.Im, Z= 2). Using x-ray photoelectron spectroscopy, we have determined the binding energies and valence states of atoms in SrxCu3V4O12. The stoichiometric composition of this phase can be represented by the chemical formula Sr2+Cu2+(V2(5+) V2(4+) )O12. Air exposure leads to the formation of SrCO3 and Sr(OH)2 on its surface and to the oxidation of univalent copper and tetravalent vanadium. According to IR spectroscopy data, the penta- and tetravalent vanadium in the high-pressure phase is in octahedral oxygen coordination. The electrical conductivity, magnetic susceptibility, thermal properties, and ion selectivity of this compound have been investigated

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8.
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   S 98


   
    Synthesis, VKβ5'' Spectra, and Magnetic Properties of M4±xV6O16±x • nH2O (M = K, Rb, Cs) Polyvanadates / V. L. Volkov, N. V. Podval'naya, V. M. Cherkashenko, S. N. Nemnonov // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 8. - P1189-1193 : il. - Bibliogr. : p. 1193 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПОЛИВАНАДАТЫ -- МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ
Аннотация: Tetragonal polyvanadates M4±xV6O16±x·nH2O (M = K, Rb, Cs) have been synthesized under hydrothermal conditions. According to the VKβ5β''spectra of the hydrates, vanadium atoms have an average valence state (the V5+V4+ charge-fluctuation frequency is higher than 10–15 s). After dehydration, the phases do not change their crystal system. The thermal properties of the compounds have been studied in air and under an inert atmosphere. K4.2V6O16.2 and Rb4,1V6O16.1 melt congruently at 720 and 690°ë, respectively. Cs3.8V6O15.8 melts incongruently at 675°ë. The magnetic susceptibility of all phases obeys the Curie–Weiss law in the range from 77 to 673 K

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9.
Инвентарный номер: нет.
   
   S 70


   
    Sodium-Doped Vanadium Oxide Nanorods / V. L. Volkov, G. S. Zakharova, N. V. Podval'naya, M. V. Kuznetsov // Russian Journal of Inorganic Chemistry. - 2008. - Vol. 53, № 6. - P854-857 : il. - Bibliogr. : p. 857 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВАНАДИЯ -- НАНОВОЛОКНА
Аннотация: Sodium-doped vanadium oxide nanorods of composition Na0.44V2O5·1.6H2O were manufactured under hydrothermal conditions (T= 150–180°C,τ= 30–50 h). Particle diameters are 20–80 nm; lengths are 0.25–1.5 μm. Particles have a layered structure with interlayer distances of 10.71±0.03Å. X-ray photoelectron and IR spectra, electrical conductivity, and thermal properties of nanorods were studied

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10.
Инвентарный номер: нет.
   
   P 78


    Podval'naya, N. V.
    Solubility of rubidium and cesium hexavanadates in sulfuric acid [Текст] / N. V. Podval'naya, V. R. Mirolyubov, V. L. Volkov // Zhurnal Neorganicheskoi Khimii. - 2004. - Vol. 49, № 5. - С. 858-861
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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