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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 [Текст] / N. V. Podval'naya, V. L. Volkov // Zhurnal Neorganicheskoi Khimii. - 2006. - Vol. 51, № 3. - С. 404-408
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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2.
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   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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3.
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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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4.
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   P 78


    Podval'naya, N. V.
    Electrode materials of Mxn+V2O5 type [Текст] / N. V. Podval'naya, V. L. Volkov // Materialovedenie. - 2006. - № 8. - С. 16-23
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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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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   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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7.
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   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.
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   I-76


   
    Ion composition of sulfuric acid solutions of vanadium(V) and the solubilities of polyvanadates in these solutions [Текст] / V. R. Mirolyubov, N. V. Podval'naya, V. L. Volkov // Zhurnal Neorganicheskoi Khimii. - 2005. - Vol. 50, № 1. - С. 111-116
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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9.
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   I-76


   
    Ion state of atoms and the properties of perovskite-like compound CaCu3V4O12 [Текст] / V. L. Volkov, N. I. Kadyrova, G. S. Zakharova, M. V. Kuznetsov, N. V. Podval'naya, K. N. Mikhalev, Yu. G. Zainulin // Zhurnal Neorganicheskoi Khimii. - 2007. - Vol. 52, № 3. - С. 378-383
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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10.
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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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