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1.
Инвентарный номер: нет.
   
   P 78


    Podval'naya, N. V.
    Composition and Formation Kinetics of Sodium Polyvanadates in Vanadium(IV, V) Solutions / N. V. Podval'naya, V. L. Volkov // Russian Journal of Inorganic Chemistry. - 2006. - Vol. 51, № 3. - P357-361 : il. - Bibliogr. : p. 360-361 (17 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПОЛИВАНАДАТЫ
Аннотация: We study how VO2+ ions affect the composition and formation kinetics of polyvanadate precipitates in solutions with 1 ≤ ç ≤ 3 at 80–90°C. The compounds have the general formula Na2.1 – xHı O31 – δ ·nH2O (0 ≤ x ≤ 1.1, 0.2 ≤ y ≤ 2.3, 0.1 ≤ δ ≤ 1.4). The maximal vanadium(IV) concentration in the precipitates (y = 2.2 and 2.3) is achieved for the V4+/V5+ ratio in the solution equal to 0.5 and 0.3 and pH of 1.7 and 3.0, respectively. The polyvanadate precipitation at pH 1.7 has a long induction period, which is not observed when V4+/V5+ > 0.02. In the solutions with pH 3.0, the precipitation occurs only when VO2+ are added. The processes are controlled by second-order reactions on the polyvanadate surface

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2.
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   I-76


   
    Ion State of Atoms and the Properties of Perovskite-Like Compound CaCu3V4O12 / V. L. Volkov, N. I. Kadyrova, G. S. Zakharova, M. V. Kuznetsov, N. V. Podval'naya, K. N. Mikhalev, Yu. G. Zainulin // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 3. - P329-333 : il. - Bibliogr. : p. 333 (16 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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.
Инвентарный номер: нет.
   
   P 78


    Podval'naya, N. V.
    Potassium vanadates of mixed valence as sulfuric acid catalyst precursors / N. V. Podval'naya, V. L. Volkov, E. I. Andreikov // Reaction Kinetics and Catalysis Letters. - 2001. - Vol. 73, № 2. - P357-365 : il. - Bibliogr. : p. 365 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ВАНАДАТЫ -- КАТАЛИЗАТОРЫ СЕРНОКИСЛОТНЫЕ
Аннотация: The kinetics of hydrolytic precipitation of potassium vanadates KxV12O31-δ·nH2O (0 < x ≤ 2.25; 0 < δ≤ 1.15) from a KVO3 solution at pH = 1.7 and 80oC in the presence of K2SO4 and VOSO4 is controlled by second and third order reactions respectively occurring on the precipitate surface. This difference is due to the effect of VO2+ ions on the polymer anion [V12O31-δ]n formation. Potassium vanadates KxV12O31-δ·nH2O and KxV3O8-δ·nH2O (1.02 ≤ x ≤ 1.91; 0 ≤ δ ≤ 0.22) can be used as vanadium-containing precursors for sulfuric acid catalysts

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4.
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   P 78


    Podval'naya, N. V.
    Ion-Selective Properties of Nanostructured Alkali-Metal-Doped Vanadium Oxide / N. V. Podval'naya, Yu. A. Bakhteeva // Inorganic Materials. - 2010. - Vol. 46, № 1. - P. 47-50 : il. - Bibliogr. : p. 50 (11 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИОНО-СЕЛЕКТИВНЫЕ СВОЙСТВА -- ОКСИД ВАНАДИЯ -- ЩЕЛОЧНЫЕ МЕТАЛЛЫ
Аннотация: We have studied thin film electrodes based on nanoparticulate vanadium oxide doped with alkali- metal cations. The hydrogen function of the electrodes manifests itself in the pH range 2–5, with a slope of 55, 54, and 54 ± 2 mV/pH for MxV2O5 - nH2O with M = Li, Na, and K, respectively. Their sensitivity range is 10–4 to 10–1 mol/l. The electrode potential as a function of concentration follows the Nernst equation with a slope of 55, 55, and 57 ± 2 mV/pC for M = Li, Na, and K, respectively. The Li+, Na+, K+, Mg2+, Ca2+, Sr2+, and Ba2+ selectivity coefficients of the electrodes are determined

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5.
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   B 17


    Bakhteeva, Yu. A.
    Gas-Sensing Properties of Nanostructured MxV2O5 (M = Na, K, Rb, Cs) Oxides / Yu. A. Bakhteeva, N. V. Podval'naya, V. L. Volkov // Inorganic Materials. - 2010. - Vol. 46, № 10. - P. 1112-1114 : il. - Bibliogr. : p. 1114 (7 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОСТРУКТУРИРОВАНННЫЕ ОКСИДЫ -- ОКСИД ВАНАДИЯ -- ЩЕЛОЧНЫЕ МЕТАЛЛЫ -- ГАЗОСЕНСОРНЫЕ СВОЙСТВА
Аннотация: The gas-sensing properties of nanostructured vanadium oxide doped with alkali-metal cations (MxV2O5 with M = Na, K, Rb, and Cs) have been studied by measuring the resistance of films as a function of analyte content using an impedance meter. The results show that the doped vanadium oxide is sensitive to hydrogen, carbon monoxide, and ammonia in the concentration ranges 0.1–80, 0.1–5, and 0.1–5 vol %, respectively. The strongest gas response is offered by Rb0.47V2O5, which is due to the smallest interlayer spacing in the structure of this nanomaterial and to its larger specific surface area

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6.
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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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7.
Инвентарный номер: нет.
   
   P 78


    Podval'naya, N. V.
    Hydrolytic Precipitation of Magnesium Polyvanadates in Vanadium (IV, V) Solutions / N. V. Podval'naya, V. L. Volkov // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 2. - P305-311 : il. - Bibliogr. : p. 311 (19 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПОЛИВАНАДАТ МАГНИЯ -- РАСТВОРЫ ВАНАДИЯ
Аннотация: The phase and chemical composition of precipitates formed in Mg(VO3)2–VOSO4–H2O system at initial pH from 1 to 7 and temperature from 80 to 90°C was studied. Polyvanadates of variable composition MgxV(4+)V(5+)12-y O31 – δ · nH2O (0.7 ≤ x ≤ 1.3, 1.2 ≤ y ≤ 2.4, 0.7 ≤ δ ≤ 1.4) were formed at pH from 1 to 4 and V4+/V5+ ratios from 0.43 to 9. Compounds with the general formula MgxV V O16 – δ. nH2O (0.7 ≤ x ≤ 0.65, y = 1.0, 0.8 ≤ δ ≤ 0.85) were formed at pH from 6.0 to 7.0 and V4+/V5+ ratios from 0.11 to 0.25. The maximum V4+ concentration (y = 2.4) in the precipitates was achieved at the VV4+/V5+ solution ratio of 1.0 and H = 3. The precipitates in solutions with pH 3 were formed only upon addition of VO2+ ions with the maximum rate at a V4+/V5+ ratio of 0.33. These processes were limited by second order reactions on the surface of polyvanadates

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8.
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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9.
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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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10.
Инвентарный номер: нет.
   
   P 78


    Podval'naya, N. V.
    Hydrolytic Precipitation of Calcium Polyvanadates from Vanadium(IV) and Vanadium(V) Solutions / N. V. Podval'naya, V. L. Volkov // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 9. - P1468-1473 : il. - Bibliogr. : p. 1473 (13 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ГИДРОЛИТИЧЕСКОЕ ОСАЖДЕНИЕ -- ПОЛИВАНАДАТ КАЛЬЦИЯ
Аннотация: The effect of VO2+ ions on the composition and kinetics of calcium polyvanadate precipitation from solutions with 1.5≤pH≤9 at 80–90°C has been studied. For 1.5≤pH < 3 and V(4+)yV(5+) = 0.11–9, the precipitated compounds have the general formula CaVxV(4+)yV(5+)12-yO31–δ· nH2O (0.8 ≤ x ≤ 1.06, 2 ≤ y ≤ 3, 0.94 ≤ δ ≤ 1.5). The maximum vanadium(IV) proportion (y = 3) in the precipitates is achieved when V4+/V5+ = 0.5–1.0 in the solution and pH is 3. Polyvanadate precipitation at pH 1.7 has a long induction period (up to 30 min), which is not observed for V4+/V5+ > 0.1. Precipitation in solutions with pH 3 occurs only when VO2+ ions are added, with a maximum rate near V4+/V5+ = 0.2 and in presence of chloride ions. The processes are controlled by a secondorder reaction on the polyvanadate surface

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