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1.
Инвентарный номер: нет.
   
   A 74


    Arkhipova, E. V.
    Subsolidus phase equilibria of in the La2O3-V2O5-Nb2O5-Ta2O5 system [] / E. V. Arkhipova, M. G. Zuev, L. V. Zolotukhina // Journal of Alloys and Compounds. - 2000. - V. 305, N 1-2. - С. 58-62. - Bibliogr.: 11 ref. . - ISSN 0925-8388
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СУБСОЛИДУС -- РАВНОВЕСИЕ ФАЗОВОЕ -- ФАЗОВОЕ РАВНОВЕСИЕ -- РАСТВОРЫ ТВЕРДЫЕ -- ТВЕРДЫЕ РАСТВОРЫ -- АНАЛИЗ РЕНТГЕНОФАЗОВЫЙ -- РЕНТГЕНОФАЗОВЫЙ АНАЛИЗ -- ОКСИД ВАНАДИЯ -- ОКСИД ЛАНТАНА -- ОКСИД НИОБИЯ -- ОКСИД ТАНТАЛА -- La2O3 -- V2O5 -- Nb2O5 -- Ta2O5 -- СТРУКТУРА КРИСТАЛЛИЧЕСКАЯ -- КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА -- ДИАГРАММЫ ФАЗОВЫЕ -- ФАЗОВЫЕ ДИАГРАММЫ -- СИСТЕМЫ ЧЕТВЕРНЫЕ -- ЧЕТВЕРНЫЕ СИСТЕМЫ -- ОКСИДЫ СЛОЖНЫЕ -- СЛОЖНЫЕ ОКСИДЫ -- V -- La -- Nb -- Ta -- ВАНАДИЙ -- ЛАНТАН -- НИОБИЙ -- ТАНТАЛ
Аннотация: X-ray phase analysis has been used to examine the phase composition of the La2O3-V2O5-Nb2O5-Ta2O5 system in the subsolidus region up to 1200 C. It was found that solid solutions including the M-fergusonite and webwerite structures, as well as a limited series of LaTaO4-based solid solutions, are formed in the ternary La2O3-Nb2O5-Ta2O5 system. Solid solutions based on the LaNb2VO9 and LaTa2VO9 compounds have been detected in the La2O3-V2O5-Nb2O5-Ta2O5 system. These solid solutions have been examined by IR and radio spectroscopy. The number of defects in the vanadium sublattice is found to depend on the composition and sintering conditions. Elementary tetrahedrons have been found in the La2O3-V2O5-Nb2O5-Ta2O5 system

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2.
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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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3.
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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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4.
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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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5.
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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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6.
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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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7.
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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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8.
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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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9.
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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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10.
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   D 26


    Davydov, D. A.
    Neutron Diffraction Analysis of a Defect Vanadium Monoxide Close to the Equiatomic Vanadium Monoxide / D. A. Davydov, A. I. Gusev, A. A. Rempel // JETP Letters. - 2009. - Vol. 89, № 4. - P194-199 : il. - Bibliogr. : p. 198-199 (24 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ВАНАДИЯ -- НЕСТЕХИОМЕТРИЯ
Аннотация: Neutron and X-ray diffraction analyses are applied to studying the defect structure of synthesis-temperature quenched and low-temperature annealed vanadium monoxides VO (0.90≤y≤0.97) close to the equiatomic monoxide VO1.0. It is found that the monoxides VO0.90 and VO0.97 contain structural vacancies not only in the oxygen sublattice, but also in the metal sublattice. In addition to the cubic disordered phase VOy with the structure B1, the monoclinic superstructure V14O6 with space group C2/m is present in the synthesized VO0.90 sample and in the annealed VO0.90 and VO0.97 samples. The formation of the V14O6 superstructure is attributed to the ordering of oxygen atoms and nonmetal vacancies in the lattice of the tetragonal solid solution of oxygen in vanadium. No simultaneous ordering of metal and oxygen vacancies in two sublattices of the cubic vanadium is observed

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11.
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   D 26


    Davydov, D. A.
    Ordered Monoclinic Vanadium Suboxide V14O6 / D. A. Davydov, A. I. Gusev // Physics of the Solid State. - 2009. - Vol. 51, № 1. - P156-164 : il. - Bibliogr. : p. 164 (22 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВАНАДИЯ -- МОНОКЛИННАЯ СВЕРХСТРУКТУРА -- ТВЕРДЫЕ РАСТВОРЫ
Аннотация: The monoclinic (space group C2/m) superstructure of the suboxide V14O6, which is formed as a result of the atomic and vacancy ordering of the tetragonal solid solution of oxygen in vanadium, is investigated using X-ray diffraction and symmetry analysis. The monoclinic suboxide V14O6 is observed in the vanadium oxide samples VO0.57, VO0.81, and VO0.86 synthesized at 1770 K and the samples VOy(0.87≤y≤0.98) additionally annealed at 1470 K after the synthesis. It is established that the channel of the disorder–order phase transition associated with the formation of the monoclinic suboxide V14O6 includes six superstructure vectors belonging to three non-Lifshitz stars of one type {k1}. The distribution function of the oxygen atoms in the monoclinic superstructure of the suboxide V14O6 is calculated. It is demonstrated that the displacements of vanadium atoms distort the body-centered tetragonal metal sublattice, thus preparing the formation of the facecentered cubic sublattice and the transition from the suboxide V14O6 to the cubic vanadium monoxide with the B1 structure

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12.
Инвентарный номер: нет.
   
   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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13.
Инвентарный номер: нет.
   
   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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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.
Инвентарный номер: нет.
   
   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.
Инвентарный номер: нет.
   
   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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17.
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   G 96


    Gusev, A. I.
    V52O64 Tetragonal Superstructure of Cubic Vanadium Monoxide with Vacancies in the Metal Sublattice / A. I. Gusev, D. A. Davydov // JETP Letters. - 2008. - Vol. 88, № 2. - P111-117 : il. - Bibliogr. : p. 117 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ВАНАДИЯ -- ТЕТРАГОНАЛЬНАЯ СВЕРХСТРУКТУРА -- НЕСТЕХИОМЕТРИЯ
Аннотация: The atom–vacancy ordering of cubic vanadium monoxide VO1.29, which has basis cubic structure B1 and structural vacancies in the metal sublattice, has been studied using the x-ray diffraction method. It has been shown that the formation of the tetragonal (space group I41/amd) ordered phase V52O64 of cubic vanadium monoxide VOy proceeds as a first-order phase transition through the disorder–order channel including 22 nonequivalent superstructure vectors of four stars {k10}, {k4}, {k3}, and {k2}. The distribution function of the vanadium atoms in the V52O64 tetragonal superstructure has been calculated

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18.
Инвентарный номер: нет.
   
   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.
Инвентарный номер: нет.
   
   K 81


    Krasil'nikov, V. N.
    Loss of activity by vanadium sulfuric acid catalysts under the action of arsenic(III) oxide vapor [Text] / V. N. Krasil'nikov, A. P. Shtin, V. I. Malkiman // Russian Journal of Applied Chemistry. - 2006. - Vol. 79, № 4. - P619-623 : il. - Bibliogr. : p. 623 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАТАЛИЗАТОРЫ -- ВАНАДИЕВЫЕ КАТАЛИЗАТОРЫ -- СЕРНАЯ КИСЛОТА -- ОКСИД МЫШЬЯКА
Аннотация: Chemical processes leading to inactivation of vanadium sulfuric acid catalysts by arsenic(III) oxide vapor were studied. The interaction and solubility in the system VO(H2AsO4)2-VOAsO4-H3AsO4 -H2O and the composition of oxovanadium arsenate in a mixed oxidation state, used as a starting substance in synthesis of (VIVO)(VVO)2(As2O7)2, were examined

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20.
Инвентарный номер: нет.
   
   K 81


    Krasil'nikov, V. N.
    Phase Ratios in the K2O-V2O4-SO3 System at High Sulfur Trioxide Concentrations / V. N. Krasil'nikov // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 2. - P258-262 : il. - Bibliogr. : p. 262 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИДНЫЕ СИСТЕМЫ -- ВАНАДИЕВЫЕ КАТАЛИЗАТОРЫ -- ТРИОКСИД СЕРЫ
Аннотация: Phase ratios in the three-component oxide system K2O–V2O4–SO3 in the region of the sulfur trioxide concentrations corresponding to its concentrations in the active component of vanadium catalysts for SO2 to SO3 conversion have been studied using powder X-ray diffraction, IR spectroscopy, microscopy, and chemical analysis. Four individual compounds (K2VO(SO4)2, K2(VO)2(SO4)3, K2VO(SO4)2S2O7, and K2(VO)2(SO4)2S2O7) and K2(VO)2(SO4)2S2O7 and VOSO4-base solid solutions of composition K2(VO)2 + x(SO4)2 + xS2O7 (0 ≤ x ≤ 1.5) were found in the system. K2VO(SO4)S2O7 and K2(VO)2(SO4)2S2O7 lose their sulfur trioxide when heated above 350°C under an inert atmosphere, and convert to K2VO(SO4)2 and K2(VO)2(SO4)3, respectively. This implies that K2VO(SO4)2S2O7 and K2(VO)2(SO4)2S2O7, as well as K2(VO)2 + x(SO4)2 + xS2O7 solid solution, cannot exist in the active component of real industrial catalysts

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