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   G 96

    Gusev, A. I.
    Atomic Displacements in the V52O64 Superstructure and the Short-Range Order in Superstoichiometric Cubic VOy Vanadium Monoxide with Metal Vacancies / A. I. Gusev // JETP Letters. - 2009. - Vol. 90, № 5. - P376-381 : il. - Bibliogr. : p. 381 (18 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ВАНАДИЯ -- СВЕРХСТЕХИОМЕТРИЯ
Аннотация: Atomic displacements in the lattice of the tetragonal V52O64 superstructure have been experimentally deter mined. It has been found that atomic displacement waves, which are attributed to the formation of the short- range displacement order, appear in the vanadium and oxygen sublattices of this superstructure. It has been shown that the V52O64 superstructure is formed on the basis of disordered superstoichiometric cubic vanadium monoxide with the short-range order in the metallic sublattice. The character of the short range order is such that vanadium atoms occupying tetrahedral positions are in the environment of four vacant sites of the vanadium sublattice. This means that the superstoichiometric VO>1.0 vanadium monoxide has a cubic structure differing from the B1 type structure characteristic of most of the strongly nonstoichiometric cubic compounds MXy (X = C, N, O) of transition metals

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   B 11


    Ba3(VO4)2-K2Ba(MoO4)2 and Pb3(VO4)2-K2Pb(MoO4)2 Systems / V. D. Zhuravlev, Yu. A. Velikodnyi, A. S. Vinogradova-Zhabrova, A. P. Tyutyunnik, V. G. Zubkov // Russian Journal of Inorganic Chemistry. - 2008. - Vol. 53, № 10. - P1632-1634 : il. - Bibliogr. : p. 1634 (7 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Phase equilibria in the Ba3(VO4)2–K2Ba(MoO4)2and Pb3(VO4)2–K2Pb(MoO4)2 systems have been investigated. In the first system, a continuous series of substitutional solid solutions with the palmierite structure is formed, and in the second one, the polymorphic transition in lead orthovanadate at 100°C restricts the extent of the palmierite-type solid solution to 10–100 mol % K2Pb(MoO4)2

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   C 11


    Ca3(VO4)2–LaVO4 Cation Conductors / I. A. Leonidov, O. N. Leonidova, L. L. Surat, R. F. Samigullina // Inorganic Materials. - 2003. - Vol. 39, № 6. - P. 616-620 : il. - Bibliogr. : p. 620 (20 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗОВОЕ РАВНОВЕСИЕ -- ВАНАДАТ КАЛЬЦИЯ -- ВАНАДАТ ЛАНТАНА
Аннотация: Experimental data are presented on the electrical conductivity, ionic transference numbers, and phase transitions of Ca3 - xLa2x/3(VO4) 2 (0<= x <= 1) vanadates, which are shown to be Ca ionic conductors. The highest Ca ion conductivity is found in Ca2La2/3(VO4)2 (palmierite structure) at low temperatures and in beta'-Ca3(VO4)2 (whitlockite-like structure) at high temperatures. The mechanisms of Ca2+ transport are discussed

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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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   C 74


    Concentration Phase Transition near the StoichiometricComposition of Vanadium Monoxide VO1.00 / D. A. Davydov, S. Z. Nazarova, A. A. Valeeva, A. A. Rempel // Bulletin of the Russian Academy of Sciences: Physics. - 2008. - Vol. 72, № 8. - P.1090-1093 : il. - Bibliogr. : p. 1093 (16 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗОВЫЙ ПЕРЕХОД -- СТЕХИОМЕТРИЯ -- МОНООКСИД ВАНАДИЯ
Аннотация: The concentration dependences of the magnetic susceptibility and lattice parameter of cubic vanadium monoxide have been measured in the composition range from VO0.81 to VO1.07. Near the stoichiometric composition VO1.00, the concentration dependences exhibit a stepwise increase in the specific magnetic susceptibility??(by approximately 0.7 X 10(-6) cm(3)/g) and lattice constant (by about 0.002 nm). These effects can be??related to the concentration phase transition, which occurs in vanadium monoxide with a change from a substoichiometric composition to superstoichiometric. At such a transition, along with a decrease in the concentration of oxygen vacancies, tetrahedrally coordinated vanadium interstitials are formed, as a result of which the??B1 structure changes to a more complex cubic phase structure with the same space group??Fm-3m

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2008, V. 72, N 8, P. 1090-1093.pdf
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   C 91


    Crystal Structure and Spectroscopic Properties A[VO2(SO4)(H2O)2] · H2O (A = K, Rb, Tl, NH4) Compounds / V. G. Zubkov, A. P. Tyutyunnik, I. F. Berger, V. N. Krasil'nikov, L. A. Perelyaeva, I. V. Baklanova // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 9. - P1415-1423 : il. - Bibliogr. : p. 1422-1423 (18 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СУЛЬФАТ ВАНАДИЯ -- СПЕКТРОСКОПИЯ
Аннотация: The crystal structure of dioxovanadium(V) sulfate trihydrates A[VO2(SO4)(H2O)2] · H2O, where A is K, Rb, Tl, or NH4, has been determined based on a combination of neutron and X-ray diffraction data. The compounds are isostructural and have a monoclinic lattice (space group P21, Z = 2) with unit cell parameters ‡ = 6.24535(8), 6.26016(7), 6.25817(5), and 6.2500(1) Å; b = 9.8417(1), 9.99736(8), 9.96217(9), and 9.9742(1) Å; c = 6.52113(8), 6.69303(5), 6.70379(6), and 6.70334(9) Å; β = 106.99(1)°, 107.83(1)°, and 107.83(1)°, 107.99(1)°, respectively. The SO4 tetrahedra and VO4(H2O)2 octahedra share an oxygen vertex to form infinite isolated chains. Atoms A have CN = 10. IR and Raman spectroscopy data are reported

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   C 91


    Crystal Structure and Spectroscopic Properties of AVO2SO4 (A = K, Rb) Compounds / A. P. Tyutyunnik, V. G. Zubkov, I. F. Berger, V. N. Krasil'nikov, L. A. Perelyaeva, I. V. Baklanova // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 9. - P1424-1429 : il. - Bibliogr. : p. 1429 (20 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА -- ВАНАДАТЫ
Аннотация: The crystal structure of alkali-metal dioxovanadium(V) sulfates AVO2SO4, where A is K or Rb, has been determined based on a combination of neutron and X-ray diffraction data. The compounds are isostructural and have an orthorhombic lattice (space group P212121, Z = 4) with unit cell parameters a = 11.1004(2) and 10.8193(1) Å; b = 8.2626(2) and 8.9042(1) Å; c = 5.4772(1) and 5.5722(1) Å, respectively. The structures are of the chain type. Zigzag chains are formed by vertex-sharing VO6 octahedra. Sulfate groups SO4 link neighboring chains and form a spatial framework with cavities accommodating alkali-metal atoms with CN = 9 (K) and 8 (Rb). IR and Raman spectroscopy data are reported

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   C 91


    Crystal structures of double vanadates LiCoVO4 and Li0:5Co1:25VO4 / O. N. Leonidova, V. I. Voronin, I. A. Leonidov, R. F. Samigullina, B. V. Slobodin // Journal of Structural Chemistry. - 2003. - Vol. 44, № 2. - P243-247 : il. - Bibliogr. : p. 247 (9 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ВАНАДАТЫ -- ШПИНЕЛИ -- ЭЛЕКТРОННАЯ СТРУКТУРА -- ЛИТИЙ
Аннотация: The crystal structures of vanadates Li1-2xCo1+xVO4 with x = 0 and 0:25 have been studied by a full pattern analysis. It has been shown that in cubic spinel LiCoVO4 (space group Fd3m), the 8a tetrahedral sites contain a majority of vanadium and a small amount of lithium; all cobalt, lithium, and a small amount of vanadium occupy the 16d octahedral sites. Li0.5Co1.25VO4 crystals belong to the rhombic system (Imma space group) with unit cell parameters a = 5:939(1) A, b = 5:810(1) A, and c = 8:303(1) A. On substitution of lithium by cobalt according to the scheme 2Li+ -> Co2+ + , half of the lithium and 70% of the vacancies formed are in the 4a octahedral sites, and one-third of lithium and most of cobalt occupy the 4d octahedral sites. The 4e tetrahedral sites are completely occupied by vanadium and lithium in a ratio of 0:92=0:08. The interatomic distances in LiCoVO4 and Li0.5Co1.25VO4 are calculated, and the sizes of lithium ion transport channels are evaluated

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   C 91


    Crystal Structures of La1-xSr2+x(GeO4)(V1-xMoxO4) (x=0-0.4) Solid Solutions / V. D. Zhuravlev, V. G. Zubkov, A. P. Tyutyunnik, Yu. A. Velikodnyi, N. D. Koryakin // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 1. - P134-136 : il. - Bibliogr. : p. 136 (11 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОРТОВАНАДАТ ЛАНТАНА -- ТВЕРДЫЕ РАСТВОРЫ
Аннотация: The phase compositions of theLaVO4–SrMoO4(1) and Sr2GeO4–SrMoO4(2) binary systems, which bound the Sr2GeO4–LaVO4–SrMoO4(3) ternary system, and the LaSr2(VO4)(GeO4)– Sr2GeO4+SrMoO4 section (4) of system 3 are studied at subsolidus temperatures. Systems 1 and 2 consist of a mixture of the initial compounds, and the La1 –xSr2 + x(GeO4)(V1 – xMoxO4) (where 0 ≤ x ≤ 0.4) region of substitutional solid solutions with a palmierite structure is formed in system 3. The unit cell parameters of the solid solutions are determined. The distribution of the lanthanum and strontium cations over two positions of the cationic sublattice is described

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10.

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   D 63


    Disintegration of a Coarse-Grained Vanadium Monoxide VOy Powder / A. A. Valeeva, D. A. Davydov, H. Schröttner, A. A. Rempel // Technical Physics. - 2009. - Vol. 54, № 11. - P1618-1621 : il. - Bibliogr. : p. 1621 (11 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ВАНАДИЯ -- ПОРОШКИ
Аннотация: A coarse grained powder of nonstoichiometric cubic vanadium monoxide VOy is disintegrated in a Retch PM 200 planetary ball mill. Milling of the coarse grained vanadium monoxide powder VOy at a rate of rotation of 500 rpm for 2 h significantly broadens diffraction lines, and the crystal structure of vanadium monoxide VO1.00 after milling remains the same. High resolution scanning electron microscopy and X-ray diffraction studies of the microstructure of vanadium monoxide demonstrate that high energy milling can produce vanadium monoxide powders with an average crystallite size of 23 ± 10 nm. The vanadium monoxide produced by milling has a crystallite size that is half the crystallite size in the titanium monoxide produced by severe plastic deformation

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11.

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   K 81

    Krasnenko, T. I.
    Effect of Thermal Transformations of Constituent Polyhedra of the Crystal Structure on the Properties of Cd2V2O7 / T. I. Krasnenko, M. V. Rotermel' // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 3. - P430-433 : il. - Bibliogr. : p. 433 (5 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПИРОВАНАДАТ КАДМИЯ -- ТЕРМИЧЕСКИЕ ПРЕВРАЩЕНИЯ
Аннотация: Analysis of variations in the linear and angular parameters of constituent polyhedra of the cad- mium pyrovanadate Cd2V2O7 structure, namely, VO4 tetrahedra and CdO6 octahedra, as calculated from the results of in situ high temperature X ray diffraction experiments in the range from 25 to 900°C, showed that, in the range from 600 to 720°C, the thermal expansion coefficient (tec) of CdO6 polyhedra is near zero, whereas VO4 tetrahedra increase in volume, although less strongly than in other temperature ranges. A structural interpretation is given to anomalous temperature dependences of cadmium ion emission and electrical conductivity on the basis of different thermal behavior patterns of the constituent polyhedra of the Cd2V2O7 structure

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12.

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   E 43


    Electrochemical properties and state of paramagnetic centers in copper-modified complex vanadium and titanium oxides [Текст] / G. S. Zakharova, L. Yu. Buldakova, V. L. Volkov, L. S. Molochnikov, E. G. Kovaleva // Russian Journal of Electrochemistry. - 2006. - Vol. 42, № 1. - С. 53-58. - Библиогр. : с. 58 (17 назв.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КСЕРОГЕЛИ -- ОКСИД ВАНАДИЯ -- ОКСИД ТИТАНА -- ВОЛЬТАМПЕРОМЕТРИЯ
Аннотация: Complex vanadium and titanium oxides modified by copper ions are studied by the electrochemical and ESR methods. Oxides CuxV2 –yTiyO5 –δ·nH2O(0
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13.

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   L 55

    Leonidov, I. A.
    Electronic Conductivity of Sr3 - 3xLa2xvacancyx(VO4)2 Solid Solutions / I. A. Leonidov, O. N. Leonidova, V. K. Slepukhin // Inorganic Materials. - 2000. - Vol. 36, № 1. - P. 72-75 : il. - Bibliogr. : p. 75 (8 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭЛЕКТРОННАЯ ПРОВОДИМОСТЬ -- РАСТВОРЫ ТВЕРДЫЕ -- ВАНАДАТЫ -- СТРОНЦИЙ -- ЛАНТАН
Аннотация: The electronic conductivity of Sr 3 3xLa2x[vacancylx(VO4)2 solid solutions was measured at oxygen pressures from 10 -13 tO 105 Pa and temperatures from 1070 to 1270 K, and their band gap was determined as a function of composition. The activation energy (~2.85 eV) and enthalpies of electron generation (=,4.2 eV) and migration (~-0.75 eV) were determined. A correlation between the band gap and electronic conductivity of the solid solutions was revealed

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14.

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   E 43


    Electronic structure and electron-phonon interactions in layered LixNbO2 and NaxNbO2 [Text] / D. L. Novikov, V. A. Gubanov, V. G. Zubkov, A. J. Freeman // Physical Review B: Condensed Matter. - 1994. - V. 49, N 22. - P15830-15835 . - ISSN 0163-1829

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ХИМИЯ -- LixNbO2 -- NaxNbO2 -- ОКСОНИОБАТ ЛИТИЯ -- ОКСОНИОБАТ НАТРИЯ -- СТРУКТУРА ЭЛЕКТРОННАЯ -- ЭЛЕКТРОННАЯ СТРУКТУРА -- ЭЛЕКТРОННО-ФОНОННОЕ ВЗАИМОДЕЙСТВИЕ -- ВЗАИМОДЕЙСТВИЕ ЭЛЕКТРОННО-ФОНОННОЕ
Аннотация: Structural, luminescence, and electronic properties of the family of alkaline metal-strontium cyclotetravanadates M2Sr(VO3)4, M=Na, K, Rb, and Cs have been characterized by means of elemental analyses, x-ray powder diffraction, neutron diffraction, electron diffraction, infrared, Raman, photo, x rays, pulse cathode beam excitation, x-ray photoelectron spectroscopy and band structure calculations. The M2Sr (VO3)4 system have tetragonal structures Na-, K-, Rb-P4/nbm and Cs-P4/mmm, with a=10.63449(4), 10.94106(6), 11.08889(8), 7.9183(3) and c=4.96205(4), 5.31600(4), 5.46682(8), 5.5778(3) Å, respectively. The main structural feature of M2Sr(VO3)4 is tetracyclic [V4O12] units. When going from Na2Sr(VO3)4 to Cs2Sr(VO3)4 do the coordination polyhedron around the alkaline metal change continuously from an octahedron to a hexagonal prism and that around the strontium from a square antiprism to a square prism. The hybridized O 2p-V 3d states of tetracyclic [V4O12] units have a dominant influence on the electronic structure of these compounds. All M2Sr(VO3)4 are semiconducting with a decreasing LDA band gap (Ea) from 2.02 for Na2Sr(VO3)4 to 1.56 eV for Cs2Sr(VO3)4

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15.

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   F 42


    Ferroelectric–Ionic Conductor Phase Transitions in Optical Nonlinear Ca9R(VO4)7 Vanadates / B. I. Lazoryak, A. A. Belik, S. Yu. Stefanovich, V. A. Morozov, A. P. Malakho, O. V. Baryshnikova, I. A. Leonidov, O. N. Leonidova // Doklady Physical Chemistry. - 2002. - vol. 384, № 4-6. - P. 144-148 : il. - Bibliogr. : p. 148 (15 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФЕРРОЭЛЕКТРИКИ -- ИОННАЯ ПРОВОДИМОСТЬ -- ФАЗОВЫЙ ПЕРЕХОД -- ВАНАДАТЫ

\\\\Expert2\\nbo\\Doklady Physical Chemistry\\2002, V. 384, N 4-6, p.144-148.pdf
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16.

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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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17.

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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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18.

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   H 99


    Influence of Oxygen Nonstoichiometry on the Special Properties of Solid Solutions LaNb2-2xTa2xVO9-delta (x = 0-0.4) and LaTa2-2xNb2xVO9-delta (x = 0-0.1) [] / M. G. Zuev, E. V. Arkhipova, L. A. Perelyaeva, L. V. Zolotukhina, O. B. Lapina, R. N. Pletnev // Journal of Solid State Chemistry. - 2002. - V.167, N 1. - С. 73-79 . - ISSN 0022-4596

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТВЕРДЫЕ РАСТВОРЫ -- ОКСИДНАЯ НЕСТЕХИОМЕТРИЯ -- НЕСТЕХИОМЕТРИЯ ОКСИДНАЯ -- ЭПР -- ЭЛЕКТРОННЫЙ ПАРАМАГНИТНЫЙ РЕЗОНАНС -- ЯМР -- ЯДЕРНЫЙ МАГНИТНЫЙ РЕЗОНАНС -- ИК-СПЕКТРОСКОПИЯ -- ИНФРАКРАСНАЯ СПЕКТРОСКОПИЯ -- СПЕКТРОСКОПИЯ ИНФРАКРАСНАЯ -- СПЕКТРАЛЬНЫЕ СВОЙСТВА -- СВОЙСТВА СПЕКТРАЛЬНЫЕ -- La -- Nb -- Ta -- V -- ЛАНТАН -- НИОБИЙ -- ТАНТАЛ -- ВАНАДИЙ -- СПЕКТРОСКОПИЯ КОМБИНАЦИОННОГО РАССЕЯНИЯ
Аннотация: Phase equilibria in the LaVO4-Nb2O5-Ta2O5 system were analyzed. New solid solutions LaTa2-2xNb2xVO9-delta (x = 0-0.1) and LaNb2-2xTa2xVO9-delta (x = 0-0.4) were detected in this system. The structures of the vanadate-niobate LaNb2VO9 and vanadate-tantalate LaTa2VO9 are not known. The structures of the vanadate-tantalate LaTa2VO9 and LaTa2VO9-based solid solutions are similar to the structure of LaTa7O19, which refers to the hexagonal crystal system. The influence of the oxygen nonstoichiometry delta (x) on crystallochemical characteristics and spectral properties of these solid solutions were examined by the X-ray phase analysis, IR and radio spectroscopic methods. A correlation between the nonstoichiometry delta (x) and the volume of a unit cell V(x) of solid solutions LaTa2-2xNb2xVO9-delta was found. The IR spectrum of LaTa2VO9-delta transformed in going from delta = 0 to delta # 0. Two types of VO4 tetrahedra were formed in solid solutions LaNb2-2xTa2xVO9-delta depending
on delta (x)

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19.

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   L 36


    Lattice dynamics in LaTa2-2xNb2xVO9-delta (x = 0-0.1) solid solutions / M. G. Zuev, L. A. Perelyaeva, E. V. Arkhipova, V. S. Kiiko // Journal of Structural Chemistry. - 2003. - Vol. 44, № 2. - P206-210 : il. - Bibliogr. : p. 210 (9 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТВЕРДЫЕ РАСТВОРЫ -- КИСЛОРОДНАЯ НЕСТЕХИОМЕТРИЯ -- СПЕКТРОСКОПИЯ
Аннотация: The oxygen nonstoichiometry delta(x) of LaTa2-2xNb2xVO9-delta (x = 0{0.1) solid solutions was studied using X-ray phase analysis, vibrational spectroscopy, and radiospectroscopy. A correlation was found between delta(x) and the unit cell volume V (x) of the solid solutions. It was shown that the infrared spectra of LaTa2VO9�� change in passing from delta = 0 to delta/= 0. The structural position of the oxygen vacancy in LaTa2-2xNb2xVO9-delta is discussed

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20.

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   D 26

    Davydov, D. A.
    Lattice Parameter, Density, and Defect System of VOy / D. A. Davydov, A. A. Rempel // Inorganic Materials. - 2009. - Vol. 45, № 6. - P. 666-670 : il. - Bibliogr. : p. 670 (13 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ВАНАДИЯ -- ПЛОТНОСТЬ -- КРИСТАЛЛИЧЕСКАЯ РЕШЕТКА
Аннотация: Vanadium monoxide, VOy has been studied within its homogeneity range using X-ray diffraction and pycnometric density measurements. The density and lattice parameter of VOy have been shown to vary in a complex manner with oxygen content near the stoichiometric composition VO 1.0. The experimental data have been used to evaluate the vanadium and oxygen vacancy contents in VOy . We assume that two cubic phases close in lattice parameter coexist near the composition VO1.0 and form a solid solution

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