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1.

Вид документа : Статья из журнала
Шифр издания : 54/I-98
Автор(ы) : Ivanovskii A. L., Zainullina V. M., Okatov S. V.
Заглавие : Chemical binding and electronic structure of fluorite-like zirconium oxynitrides
Место публикации : Journal of Structural Chemistry. - 2000. - Vol. 41, № 4. - С. 553-559: il.
Примечания : Bibliogr. : p. 559 (27 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): оксинитриды циркония--флюоритоподобная структура
Аннотация: The electronic energy structures of fluorite-like (F) zirconium dioxynitrides F-ZrO2-xNy in Zr-O-N systems were studied by the linear muffin-tin orbital--tight binding (LMTO-TB) ab initio band structure method. The electronic structures of defects (nitrogen atoms and anion vacancies) and their effect on the band structure of F-ZrO2 are discussed; defect clustering and probable reasons for structural ordering in the F-ZrO2-xNy phases are analyzed. Interatomic interaction indices are estimated in terms of Hiickel's semi-empirical band structure method. The cubic structure of zirconium dioxynitrides is stabilized by the formation of new bonding hybrid Zrd-Np states; the role of anion vacancies reduces to providing the optimal population of these states
\\\\expert2\\NBO\\Journal of Structural Chemistry\\2000, V. 41, N 4, p.553-559.pdf
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2.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Zhukov V. P., Zhukovskii V. M., Zainullina V. M., Medvedeva N. I.
Заглавие : Electronic structure and chemical bonding in bismuth sesquioxide polymorphs
Место публикации : Journal of Structural Chemistry. - 1999. - Vol. 40, № 6. - С. 831-837: il.
Примечания : Bibliogr. : p. 837 (23 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): лмто метод--оксид висмута
Аннотация: The electronic structure of the alfa-Bi203 . beta-Bi203 and gamma-Bi203 phases was investigated by the ab initio sell-consistent LMTO method in a tight bindbtg approximation attd by the sent iempbical Hiickel method. The total and partial densities of states and Mulliken overlap populations were obtained. The stability of bismuth oxide polymorphs is discussed based on the results of the total energy calculations for crystals. An analysis of chemical bonding shows that the Bi-O interaction plays the leading role. The Bi-Bi metallic bond is absent. Mechanisms of oxygen ion migration and possible stabilization of the structure of the supelionic conductor beta-Bi20 3 are discussed
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3.

Вид документа : Статья из журнала
Шифр издания : 54/N 72
Автор(ы) : Dmitriev A. V., Denisova T. A., Arsenov S. G., Volkov V. L.
Заглавие : NMR and structural features of H2V12031_y*nH20
Место публикации : Journal of Structural Chemistry. - 1992. - Vol. 33, № 3. - С. 392-396: il.
Примечания : Bibliogr. : p. 396 (8 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): ксерогели--поливанадиевая кислота--ямр--пленки
Аннотация: In H2VI2031-y.nH20 films with different degrees of hydration, parameters of hyperfine interaction on SlY nuclei have been determined. It has been established that the of axial symmetry plane of the tensor of magnetic interactions coincides with the plane of the film. For a completely dehydrated specimen, values have been found for the most probable direction (40 ~ from the plane of the film) and magnitude of the electric field gradient (EFG) on SiV nuclei (eq-Q/h = 0.2333 MHz). Analysis of the angular dependence of the width of the satellites has shown the presence of disorientation of the principal direction of the EFG with a width of distribution about 50 ~ in the plane of the film. In view of the absence of satellites and the presence of an angular dependence of the central transition of the 51V NMR spectra of the hydrated specimens, it can be stated that the interaction of the V-O layer with water molecules leads to an increase of disorientation in the plane of the film. The change in magnetic shifts is discussed, and it is concluded that there is a nonuniform change of population of the conduction band upon dehydration
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4.

Вид документа : Статья из журнала
Шифр издания : 54/I-98
Автор(ы) : Ivanovskaya V. V., Enyashin A. N., Ivanovskii A.I.
Заглавие : Electronic structure of fullerenelike molecules based on TiO2, SnO2, and SnS2
Место публикации : Journal of Structural Chemistry. - 2004. - Vol. 45, № 1. - С. 151-155: il.
Примечания : Bibliogr. : p. 154-155 (16 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): фуллерены--моделирование--оксид титана--двуокись олова--нанотрубки
Аннотация: Quantum-chemical modeling of electronic structure and interatomic interaction parameters has been performed for a series of fullerenelike cage molecules based on the isoelectronic TiO2, SnO2, and SnS2. The above characteristics are analyzed in relation to the type of atomic configuration, as well as the size and chemical composition of a nanostructure
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5.

Вид документа : Статья из журнала
Шифр издания : 54/M 17
Автор(ы) : Samokhvalov A. A., Arbuzova T. I., Viglin N. A., Osipov V. V., Solin N. I., Naumov S. V., Bamburov V. G., Lobachevskaya N. I., Reznitskikh O. G.
Заглавие : Magnetic and electrical properties of Mg12xCuxO solid solutions and magnetic shielding in Cu–Mg12xCuxO structures
Место публикации : Physics of the Solid State. - 1999. - Vol. 41, № 2. - С. 262-264: il.
Примечания : Bibliogr. : p. 264 (7 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): сверхпроводники--оксикупрат магния--электропроводность
Аннотация: Mg12xCuxO solid solutions having an NaCl structure with 0x0.20 are synthesized andCu–Mg12xCuxO structures are prepared for superconductivity studies. The magnetic susceptibility x, electron paramagnetic resonance ~EPR!, and electrical conductivity of the solid solutions are studied at temperatures of 5–550 K. It is shown that x21(T) obeys the Curie–Weiss law with a paramagnetic Curie temperature Q close to zero and an effective magnetic moment meff 51.9mB , close to the 1.73mB of a Cu21 ion with spin S51/2. The width DH of the EPR line depends weakly on temperature and increases as x is raised. The volume narrowing of the EPR linewidth DH is used to estimate the exchange interaction parameter, 331024 eV. The g-factor is close to 2 and is temperature independent. The electrical conductivity of Mg12xCuxO at T5300 K is '10211210212V21cm21 for x50 and increases to 1025 21026V21cm21 for x50.1520.20. The conductivity is p-type. Magnetic shielding is observed in Cu–Mg12xCuxO structures with x50.15 and 0.20. The possible connection of this phenomenon with interference superconductivity in the contact layer of the structure is discussed
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6.

Вид документа : Статья из журнала
Шифр издания : 54/V 26
Автор(ы) : Krasil'nikov V. N., Shtin A. P., Gyrdasova O. I., Baklanova I. V., Perelyaeva L. A.
Заглавие : Vanadyl and Titanium Glycolates as Precursors for the Preparation of Oxide Materials in the Form of Elongated Microparticles and Nanoparticles
Место публикации : Nanotechnologies in Russia . - 2008. - Vol. 3, № 1-2. - С. 106-111: il.
Примечания : Bibliogr. : p. 110-111 (14 ref.)
ISSN: 1995-0780
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): гликолят ванадила--гликолят титана--оксиды--наночастицы
Аннотация: This paper reports on the results of investigations of the optimum conditions for the formation and properties of vanadyl and titanium glycolates of the compositions VO(OCH2CHO) and Ti(OCH2CH2O)2 with elongated crystals, as well as solid solutions of the composition Ti1–xVx(OCH2CH2O)2(0 x≤0.13). New techniques are developed for synthesizing the compounds under investigation. These techniques are based on the interaction of the V2O5nH2O,NH4VO3, VO(OH)2, and Ti(OH)4compounds with ethylene glycol under heating. It is established that heat treatment of the VO(OCH2CH2) compound in air results in the formation of whiskers of the compositions V2O4(T≥200°C) and V2O5(T≥400°C) with a particle shape characteristic of the initial material. The appropriate treatment in an inert gas atmosphere leads to the formation of vanadium(III) oxide. Heating of the Ti(OCH2CH2O)2 and Ti1 –xVx(OCH2CH2O)2 compounds in air results in the formation of TiO2 and Ti1 –xVxO2oxides with an anatase structure at temperatures T≥400°C and a rutile structure at T≥750°C; in this case, the needle or fiber shape of precursors is retained in the synthesized oxides
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7.

Вид документа : Статья из журнала
Шифр издания : 54/S 81
Автор(ы) : Ivanovskaya V. V., Ivanovskii A. L.
Заглавие : Simulation of Novel Superhard Carbon Materials Based on Fullerenes and Nanotubes
Место публикации : Journal of Superhard Materials. - 2010. - Vol. 32, № 2. - С. 67-87: il.
Примечания : Bibliogr. : p. 82-87 (143 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): моделирование--сверхтвердые материалы--фуллерены--нанотрубки
Аннотация: The state-of-the-art in theoretical research directed at the search for superhard materials based on carbon fullerenes and nanotubes has been briefly reviewed. The data available on elastic properties of the main groups of condensed phases that form due to the interaction of fullerenes or (and) nanotubes because of both weak (of the van der Waals type) bonds and polymerization to form strong covalent sp3 bonds have been considered. Models for new hypothetical carbon nanostructured materials (the so called autointercalated hyperdiamonds, covalently bonded lattices of nanotubes, tubular cubic crystals, etc.) are discussed, and elastic properties of them are considered as related to their atomic structure, special features of their electronic structure and chemical bond have been discussed. The problems of synthesis of these systems are briefly considered
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8.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Ryzhkov M. V., Novikov D. L., Zubkov V. G., Gubanov V. A.
Заглавие : Electronic structure and chemical bonding in Ba-Cu-O layer systems
Место публикации : Journal of Structural Chemistry. - 1989. - Vol. 30, № 5. - С. 713-716: il.
Примечания : Bibliogr. : p. 716 (9 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): метод дискретного варьирования--иттрий-бариевый купрат
Аннотация: The cluster method of discrete variation was used to study compounds containing chains of planecoordinatedcopper ions separating oxygen--copper planes. We also examined real YBa2CuaO 7 and hypothetical MBasCu409 systems (M is a tetravalent metal ion). A study was carried out on the transformation of the valence band and structure of the molecular orbitals in the Fermi level in going from YBa2Cu307 to MBasCu409. The chemical bonding was analyzed and the role of the "interchain" interaction in the bonding of the copper and oxygen atoms in different crystallographic positions was determined
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9.

Вид документа : Статья из журнала
Шифр издания : 54/L 79
Автор(ы) : Lipatnikov V. N., Gusev A. I.
Заглавие : Dependence of the resistivity of nonstoichiometric titanium carbide TiCy on the density and distribution of carbon vacancies
Место публикации : Journal of Experimental and Theoretical Physics. - 1999. - Vol. 70, № 4. - С. P. 294-300: il.
Примечания : Bibliogr. : p. 300 (17 ref.)
ISSN: 0021-3640
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нестехиометрия--карбид титана
Аннотация: The influence of temperature and of the density and distribution of structural vacancies in the carbon sublattice on the resistivity of nonstoichiometric titanium carbide TiCy (0.5y0.98) is studied. It is shown that in titanium carbide TiCy with y,0.7 reversible disorder– order structural phase transitions occur at temperatures below 1000 K. The temperatures of order–disorder phase transformations are determined. The dependence of the residual resistivity on the composition of the disordered titanium carbide is explained by the change in the carrier density in the region of homogeneity of the carbide TiCy , on the one hand, and the atom–vacancy interaction, on the other
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10.

Вид документа : Статья из журнала
Шифр издания : 54/S 89
Автор(ы) : Enyashin A. N., Ivanovskaya V. V., Makurin Yu. N., Ivanovskii A. L.
Заглавие : Structure and Electronic Spectrum of Fullerene-like Nanoclusters Based on Mo, Nb, Zr, and Sn Disulfides
Место публикации : Inorganic Materials. - 2004. - Vol. 40, № 4. - С. P. 395-399: il.
Примечания : Bibliogr. : p. 398-399 (21 ref.)
ISSN: 0020-1685
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нанокластеры фуллереноподобные--дисульфид молибдена--дисульфид ниобия--дисульфид олова--дисульфид циркония
Аннотация: Modeling results are presented on the atomic structure, electronic spectra, and interatomic interaction parameters of quasi-zero-dimensional fullerene-like nanoparticles of Mo, Nb, Zr, and Sn disulfides. These characteristics are analyzed in relation to the chemical composition, size, and atomic configuration of the nanoparticles and are compared to those of nanotubes and crystals of the corresponding disulfides
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11.

Вид документа : Статья из журнала
Шифр издания : 54/I-98
Автор(ы) : Ivanovskaya V. V., Enyashin A. N., Ivanovskii A. L.
Заглавие : Structure, Electronic Spectrum, and Chemical Bonding of Fullerene-like Nanoparticles Based on MB2(M = Mg, Al, Sc, Ti) Layered Diborides
Место публикации : Inorganic Materials. - 2004. - Vol. 40, № 2. - С. P. 134-143: il.
Примечания : Bibliogr. : p. 141-143 (63 ref.)
ISSN: 0020-1685
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): фуллереноподобные наночастицы--дибориды слоистые--дибориды металлов
Аннотация: The structure, electronic spectrum, and interatomic interaction parameters of MnB2n(n= 10, 30, 90, 120, 160; M = Mg, Al, Sc, Ti) fullerene-like molecules based on MB2 layered diborides are assessed using quantum-chemical modeling and are analyzed in relation to the atomic configuration, size, and chemical composition of MnB2n. The electronic structure of concentric nanoparticles consisting of MnB2n cage molecules having identical (M10B20@M90B180) or ifferent (M10B20@ B180, where M, M' = Mg, Al) compositions isconsidered. The results are compared with the electronic properties of crystalline MB2 phases
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12.

Вид документа : Статья из журнала
Шифр издания : 54/G 96
Автор(ы) : Gusev A. I.
Заглавие : of NonstoichiometricEffect of Carbon Vacancies on the Electric Resistivity of Nonstoichiometric VCy Vanadium Carbide
Место публикации : JETP Letters. - 2009. - Vol. 90, № 3. - С. 191-196: il.
Примечания : Bibliogr. : p. 196 (21 ref.)
ISSN: 0021-3640
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нестехиометрия--карбид ванадия--электросопротивление
Аннотация: The influence of the temperature, concentration, and distribution of structure vacancies of the carbon sub lattice on the electric resistivity ρ of nonstoichiometric VCy vanadium carbide (0.66 ≤ y ≤ 0.875) has been studied in the temperature range of 300–1200 K. The symmetry and structure characteristics of the ordered V6C5 and V8C7 phases formed owing to low temperature annealing on various sections of the homogeneity region of the VCy carbide. The dependence of the residual electric resistivity on the content of the disordered vanadium carbide is explained by the atom–vacancy interaction and the change in the carrier concentration in the homogeneity region of VCy
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13.

Вид документа : Статья из журнала
Шифр издания : 54/G 92
Автор(ы) : Gubanov V. A., Zhukov V. P., Ivanovskii A. L.
Заглавие : Proceedings of the second all-union conference of solid-state quantum chemistry
Место публикации : Journal of Structural Chemistry. - 1986. - Vol. 27, № 6. - С. 959-965: il.
Примечания : Bibliogr. : p. 965 (22 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): квантовая химия--квантово-химические расчеты
Аннотация: Calculations are presented on the electronic structures and atomic interaction parameters for various cubic and hexagonal refractory phases based on d metals, which have been made with various band models (LMTO, CCR Green's functions), and cluster ones (semiempirical, XaRW, X~DW). Freatures of the energy spectra for these compounds are discussed when vacancies and impurities are present. Particular attention is given to calculations on macroscopic parameters (lattice constant, elastic constants, atomization energy, and Tmp) of particular interest in the material science of these compounds
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14.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Ivanovskii A. L., Gubanov V. A., Zainulin Yu. G., Kurmaev E. Z., Butsman M. P., Zborovskii B. I.
Заглавие : Electronic structure and interparticle interaction in defect cubic oxides of vanadium and titanium
Место публикации : Journal of Structural Chemistry. - 1982. - Vol. 23, № 6. - С. 854-860: il.
Примечания : Bibliogr. : p. 859-860 (25 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): монооксид ванадия--монооксид титана--квантово-химические расчеты
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15.

Вид документа : Статья из журнала
Шифр издания : 54/D 67
Автор(ы) : Dmitriev A. V., Arsenov S. G., Volkov V. L.
Заглавие : 51V NMR of Inclusion Compounds H2V12031- y.nH20
Место публикации : Journal of Inclusion Phenomena and Molecular Recognition in Chemistry. - 1991. - Vol. 11. - С. 89-95: il.
Примечания : Bibliogr. : p. 95 (9 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): ядерный магнитный резонанс--ксерогели--пленки
Аннотация: The parameters of hyperfine interactions on 51V nuclei were determined on films of the inclusion compound H2VI2031-y.n H20 at different stages of hydration. It was established that the axial symmetry plane of the magnetic interaction tensor coincides with the film plane. The most probable direction (40 ° of the film plane) and the magnitude of the electric field gradient (EFG) on 51V nuclei (eqQ/h = 0.233 MHz) were found for a completely dehydrated sample. An analysis of the line width angular dependences of satellites has shown the existence of a disorientation of the main EFG direction with a distribution width of about 50 ° in the film plane. The absence of satellites and the presence of an angular dependence of the 51V NMR central signal of hydrated samples allowed the conclusion that the interaction of the V--O layer with molecules of water led to an increase in the disorientation of the film plane
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16.

Вид документа : Статья из журнала
Шифр издания : 54/B 24
Автор(ы) : Shur V. Ya., Rumyantsev E. L., Kuminov V. P., Subbotin A. L., Kozhevnikov V. L.
Заглавие : Barkhausen effect in stepped motion of a plane domain boundary in gadolinium molybdate
Место публикации : Physics of the Solid State. - 1999. - Vol. 41, № 2. - С. 269-273: il.
Примечания : Bibliogr. : p. 272-273 (18 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): молибдат гадолиния--домены
Аннотация: Barkhausen pulses generated in stepped motion of a single plane domain boundary ~PDB! are investigated experimentally in single-crystalline wafers of the extrinsic ferroelastic ferroelectric gadolinium molybdate containing artificial pinning centers of the ‘‘field inhomogeneity’’ type near the edges of the sample. Two scenarios of the evolution of a PDB in interaction with ‘‘defects’’ are proposed on the basis of analyzing the shape of the pulses in a linearly increasing field: small changes of the pulse shape in a weak field and the generation of wedge domains in a strong field. The proposed mechanism of PDB motion due to the generation of steps near the edge of the sample and their longitudinal motion provides a means for explaining the experimentally observed linear field dependence of the PDB velocity and for determining the velocity of the steps
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17.

Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Krasil'nikov V. N., Shtin A. P., Perelyaeva L. A., Baklanova I. V., Tyutyunnik A. P., Zubkov V. G.
Заглавие : Synthesis and Physicochemical Study of M4Na2V10O28 · 10H2O (M = K, Rb, NH4)
Место публикации : Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 2. - С. 162-166: il.
Примечания : Bibliogr. : p. 166 (6 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): декаванадаты двойные--кристаллизация
Аннотация: The formation conditions and physicochemical properties of binary decavanadates M4Na2V10O28 · 10H2O (M = K, Rb, NH4), synthesized by crystallization from saturated solutions of the NaVO3–MH2AsO4–H2O systems, were studied by chemical analysis, X-ray powder diffraction, microscopy, thermogravimetry, and IR spectroscopy. To optimize the synthesis conditions of M4Na2V10O28 · 10H2O, the (1 – x)NaVO3 · 2H2O · xMH2AsO4–H2O (0.2 ≤ x ≤ 0.8) isomolar series method was applied to studying the interaction in the NaVO3–MH2AsO4–H2O systems (M = K, Rb, Cs) at the 0.4 mol/L total molar concentration of NaVO3 and MH2AsO4 in solutions. The studied M4Na2V10O28 · 10H2O compounds were shown to be isostructural with triclinic crystals (Z = 1, space group P ), and their unit cell parameters were estimated
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18.

Вид документа : Статья из журнала
Шифр издания : 54/S 94
Автор(ы) : Surat L. L., Zuev M. G.
Заглавие : Phase Formation in the V2O5-Nb2O5-MoO3 System
Место публикации : Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 10. - С. 1617-1619: il.
Примечания : Bibliogr. : p. 1619 (9 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): ниобий--системы оксидные--гидрокарбид ниобия
Аннотация: The solid-phase interaction in the V2O5–Nb2O5–MoO3 system has been investigated, and the formation of a solid solution bounded by the compositions MoNb2V4O18–δ,Mo2NbV5O21–δ, Mo2Nb3V3O21 – δ, and Mo4Nb9V9O57 – δ has been found (δ is nonstoichiometry). In the V2O5–Nb2O5 system, the formation of three compounds is verified, namely, VNbO5 (tetragonal structure), VNb9O25, and V2Nb23O62.5. The first two compounds are isostructural and form a continuous solid solution with tetragonal symmetry. A new compound of the composition Mo3NbVO14 – δ has been synthesized. This compound is isostructural to the Mo3Nb2O14 compound described in the literature and forms a tetragonal solid solution with it. The phase equilibria in the V2O5−Nb2O5–MoO3 system in the subsolidus region have been determined
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19.

Вид документа :
Шифр издания : 54/K 81
Автор(ы) : Krasil'nikov V. N.
Заглавие : Phase Ratios in the M2O–V2O5–SO3 (M = Rb, Cs) Systems and the Properties of the Compounds Formed in These Systems
Место публикации : Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 3. - С. 419-423: il.
Примечания : Bibliogr. : p. 423 (21 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): оксидные системы--порошковая дифракция--щелочные металлы
Аннотация: Powder X-ray diffraction and microscopy have been used to study phase ratios of the M2O–V2O5–SO3 (M = Rb, Cs) systems, which model the active component of rubidium–vanadium and cesium–vanadium catalysts for sulfuric acid production at high sulfur dioxide conversions. We have stated that each system forms four compounds: M3VO2(SO4)2, MVO2SO4, M4V2O3(SO4)4, and MVO(SO4)2. The thermal properties of these compounds and their interaction with water vapor saturated at room temperature have been studied. The unit cell parameters have been determined for the compounds MVO2SO4 (M = K, Rb), MVO(SO4)2, and M[VO2(SO4)(H2O)2] · H2O (M = Rb, Tl). The reciprocal transformations of the components and phases of the M2O–V2O5–SO3 systems match the Lux–Flood ideas of the acid–base properties of oxide compounds
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20.

Вид документа : Статья из журнала
Шифр издания : 54/P 56
Автор(ы) : Ermakov A. E., MIsharina I. V., Grigorov I. G., Pushin V. G., Zainulin Yu. G.
Заглавие : Phase Composition and Some Properties of Titanium Carbonitride–Titanium Nickelide Alloys with Al2O3 Nanoparticles
Место публикации : Russian Metallurgy (Metally). - 2009. - № 1. - С. 77-81: il.
Примечания : Bibliogr. : p. 81 (10 ref.)
ISSN: 0036-0244
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): карбонитрид титана--никелид титана--сплавы
Аннотация: The phase formation in and the microstructure of titanium carbonitride–titanium nickelide alloys with aluminum oxide Al2O3 nanopowder additions are studied by X-ray diffraction, electron-microscopic, and electron-probe microanalyses. The phase interaction is characterized by the redistribution of nonmetallic elements and aluminum between refractory and binding phases with the formation of a nonstoichiometric titanium–aluminum (Ti,Al)(C,N) carbonitride and a titanium–aluminum nickelide. The number of forming phases and their compositions are controlled by the kinetic parameters of the process
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