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 Найдено в других БД:Нанотехнологии (18)
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1.
Инвентарный номер: нет.
   
   G 96


    Gusev, A. I.
    A sequence of transformations related to the formation of M3X2-type superstructures / A. I. Gusev // Journal of Experimental and Theoretical Physics. - 2015. - Vol. 120, № 1. - P91-96
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
M3X2 -- КАРБИД ВАНАДИЯ -- НЕСТЕХИОМЕТРИЯ -- НАНОСТРУКТУРА
Аннотация: A symmetry analysis of monoclinic, orthorhombic, and trigonal M3X2-type superstructures that can be formed in strongly stoichiometric MX y compounds with B1 structure is carried out. Channels of order-disorder transitions MX y → M3X2 are determined. It is shown that, as temperature decreases, two physically admissible sequences of transformations associated with the formation of M3X2 superstructures are possible in nonstoichiometric MX y compounds of group IV transition metals. By an example of vanadium carbide VC y , it is demonstrated that orthorhombic or monoclinic V3C2 superstructures can be obtained with the formation of a nanostructure.

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2.
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   I-98


    Ivanovskaya, V. V.
    Electronic structure of titanium disulfide nanostructures: Monolayers, nanostripes, and nanotubes [Text] / V. V. Ivanovskaya, G. Seifert, A. L. Ivanovskii // Semiconductors. - 2005. - Vol. 39, № 9. - P1058-1065. - Bibliogr. : p. 1065 (34 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДИСУЛЬФИД ТИТАНА -- НАНОВОЛОКНА -- НАНОСТРУКТУРА -- НАНОТРУБКИ
Аннотация: Atomic models for quasi-1D planar (nanostripe) and cylindrical (nanotube) nanostructures consisting of 1T and 2H TiS2 phases are suggested. By using a self-consistent band approach to the electron-density functional in the tight-binding approximation, specific features of the electronic spectrum of these nanostructures and the conditions necessary for their stability are studied in comparison with 2D (molecular monolayer) and 3D (crystal) TiS2 forms. The possibility of 1T <->2H phase transitions in the nanostructures is analyzed for the first time. It is established that the octahedral atomic surrounding characteristic of a stable 1T TiS2 crystalline phase is retained in the 2D and 1D nanostructures. In contrast to 3D TiS2, all the stable 2D and 1D nanostructures are semiconductors. The regular modifications of the energy-band spectrum of the TiS2 nanostructures in relation to their type and atomic arrangement are found

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3.
Инвентарный номер: нет.
   
   I-98


    Ivanovskii, A. L.
    Titanium nanocarbides: Synthesis and modeling [Text] / A. L. Ivanovskii // Theoretical and Experimental Chemistry. - 2007. - Vol. 43, № 1. - P1-27. - Bibliogr. : p. 23 (157 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАРБИД ТИТАНА -- НАНОСТРУКТУРА -- МОДЕЛИРОВАНИЕ
Аннотация: The present state of research on the production and modeling of nanostructures based on titanium carbide – a typical representative of an extensive class of carbides of d- and f-metals – is reviewed. Methods for the synthesis of various Ti–C nanostructures (molecular clusters, nanocrystallites, nanospheres, nanofibers, nanowires) are examined, and their morphology, atomic structure, and known physicochemical characteristics are described. Theoretical models of the atomic structure and properties of new types of nanostructures in the titanium–carbon system (endo- and exohedral titanofullerenes, “hybrid” structures based on carbon nanotubes, the so-called peapods, nanocables, and a number of others) and the prospects for their application as components of nanoceramics, hydrogen accumulators, materials for spintronics, etc. are discussed

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4.
Инвентарный номер: нет.
   
   L 79


    Lipatnikov, V. N.
    Crystal structure and microstructure of disordered and ordered vanadium carbonitrides [Text] / V. N. Lipatnikov, A. I. Gusev // Inorganic Materials. - 2007. - Vol. 43, № 8. - P. 827-833 : il. - Библиогр. : с. 832-833 (28 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- КАРБОНИТРИДЫ ВАНАДИЯ -- НАНОСТРУКТУРА
Аннотация: The ordering of nonstoichiometric VCxNy (x + y = 0.85) vanadium carbonitrides has been studied by x-ray diffraction and optical microscopy. The results indicate that the ordering of VCxNy carbonitrides leads to the formation of a V6(C,N)5 (V6C5 structure) or V8(C,N)7 (V8C7 structure) superstructure, depending on composition. The C and N atoms in the nonmetal sublattice of these superstructures form one sublattice, and structural vacancies form another sublattice. The C and N atoms are arranged at random in their sublattice. Thus, the ordering of vanadium carbonitrides leads to the formation of interstitial and vacancy sublattices, but the carbon and nitrogen atoms do not form separate sublattices. The formation of V6C5- and V8C7-type superstructures in vanadium carbonitrides is accompanied by the breakdown of the grains of the parent, disordered phase into 20- to 40-nm domains of the ordered phase and by the nanostructuring of the bulk material. The formation of the ordered domains begins at grain boundaries of the disordered phase

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5.
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   N 21


   
    Nanostructure of Dispersed and Compact Nonstoichiometric Vanadium Carbide / A. I. Gusev, A. A. Tulin, V. N. Lipatnikov, A. A. Rempel // Russian Journal of General Chemistry. - 2002. - Vol. 72, № 7. - P997-1006 : il. - Bibliogr. : p. 1005-1006 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОСТРУКТУРА -- НЕСТЕХИОМЕТРИЯ -- КАРБИД ВАНАДИЯ
Аннотация: Structure and properties of dispersed and compact nanocrystalline vanadium carbide VC0.875 were studied. Dispersed vanadium nanocarbide was prepared by prolonged aging of a coarse-grained VC0.875 powder. It has a unique nanostructure: nanocrystallites of dispersed vanadium carbide have a shape of bent lobes up to 600 nm in diameter and 15320 nm thick. Annealing and quenching of compact samples of coarsegrained VC0.875 carbide result in the formation of a nanodomain structure. The nanostructured carbide VC0.875 corresponds in composition to the higher boundary of a homogeneity area of a cubic phase and mainly contains ordered V8C7 phase, which belongs to the P4332 space group. Cold pressing and subsequent vacuum sintering of vanadium carbide nanopowder at 2000 K gave sintered samples approaching diamond in microhardness.

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6.
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   N 52


   
    New framework nanostructures of carbon atoms in sp2 and sp3 hybridized states [Текст] / A. E. Belenkov, A. L. Ivanovskii, S. N. Ul'yanov, F. K. Shabiev // Journal of Structural Chemistry. - 2005. - Vol. 46, № 6. - С. 961-967. - Библиогр. : с. 966 (36 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
УГЛЕРОД -- НАНОСТРУКТУРА
Аннотация: A new family of framework nanostructures including carbon atoms in sp2 and sp3 hybridized states is reported. Structure optimization was fulfilled using MM+ molecular mechanics and Hückel semiempirical methods. The energy characteristics of the structures have been evaluated. Comparative analysis of the stability of the title nanostructures has been performed in relation to their geometry and relative contents of sp2/sp3 atoms

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7.
Инвентарный номер: нет.
   
   R 42


    Rempel, A. A.
    Nanostructure and atomic ordering in vanadium carbide / A. A. Rempel, A. I. Gusev // Journal of Experimental and Theoretical Physics. - 1999. - Vol. 69, № 6. - P. 472-478 : il. - Bibliogr. : p. 478 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАРБИД ВАНАДИЯ -- НАНОСТРУКТУРА
Аннотация: Nanostructured nonstoichiometric vanadium carbide VC0.87 was obtained in powdered form using the ordering effect. The composition, structure, and properties of the carbide were studied by chemical and thermogravimetric analysis, gas chromatography, x-ray diffraction, optical and electronic microscopy, electron–positron annihilation, magnetic susceptibility, and microhardness methods. Nanostructured vanadium carbide VC0.87 possesses the crystal structure of the cubic ordered phase V8C7 with space group P4332. Vanadium carbide nanocrystallites are shaped in the form of 400–600 nm in diameter and 15–20 nm thick curved petals. The surface layer of the nanocrystallites contains defects of the vacancy agglomerate type. The microhardness of vanadium carbide, obtained by vacuum sintering of VC0.87 nanopowder was 60–80 GPa, which is 3–4 times greater than the microhardness of coarse-grained vanadium carbide with the same composition and close to the hardness of diamond

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8.
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   S 12


    Sadovnikov, S. I.
    Crystal Structure of Nanostructured PbS Films at Temperatures of 293–423 K / S. I. Sadovnikov, A. A. Rempel // Physics of the Solid State. - 2009. - Vol. 51, № 11. - P2375-2383 : il. - Bibliogr. : p. 2383 (27 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СУЛЬФИД СВИНЦА -- НАНОСТРУКТУРА
Аннотация: The crystal structure of lead sulfide films prepared by the hydrochemical deposition has been studied by X-ray diffraction. The thickness of the films synthesized is ~100 nm, the size of coherent scattering regions is ~70 nm, and the value of microstrains is ~0.20%. It is established, for the first time, that the assynthesized PbS films and the same films annealed in the temperature range 293–423 K have a cubic crystal structure (space group Fm3m) different from the B1 type structure. In the crystal lattice of the structure revealed, sulfur atoms are located not only in the 4(b) positions but also in the 8(c) positions. The occupancies of the 4(b) and 8(c) positions by the S atoms are ~0.84 and 0.08, respectively

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9.
Инвентарный номер: нет.
   
   T 80


   
    Towards particle size regulation of chemically deposited lead sulfide (PbS) [Текст] / A. A. Rempel, N. S. Kozhevnikova, A. J. G. Leenaers, S. Van den Berghe // Journal of Crystal Growth. - 2005. - Vol. 280, № 1-2. - С. 300-308
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОСТРУКТУРА -- СУЛЬФИДЫ -- СВИНЕЦ -- ОСАЖДЕНИЕ
Аннотация: Powders and solid films of lead sulfides (PbS) were produced by chemical bath deposition from thiourea aqueous solutions at a temperature of 325 K. By a Rietveld-like analysis of the X-ray spectra, it was shown that nanocrystalline PbS has the same rock salt structure B1 (space group Fm-3m) as coarse grained or single crystalline PbS. Nevertheless, this B1 structure is a very distorted structure with root mean square displacements up to 0.011nm and with a microstrain up to 0.3%. The particle sizes in the PbS powders and films measured by scanning electron microscopy (SEM) are found to be in agreement with those determined by Bragg–Brentano X-ray diffraction (XRD) on powders and by glancing incident diffraction (GID) on films. It was found that by changing the chemical affinity in the range from 31.4 to 38.7 kJ/mol, it is possible to regulate the particle size of the chemically deposited sulfide powders from 100 to 300 nm.

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10.
Инвентарный номер: нет.
   
   А 92


   
    Атомное упорядочение - новый метод создания наноструктуры в твердом теле [] = Atomic orderingas a new way of nanostructure creation in a solid / А. И. Гусев, А. С. Курлов, В. Н. Липатников, А. А. Ремпель // Журнал структурной химии. - 2004. - Т. 45, прил. - С. 15-23: ил. - 15-23: ил. - Библиогр.: с. 23 (19 назв.) . - ISSN 0136-7463
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АТОМНОЕ УПОРЯДОЧЕНИЕ -- НАНОСТРУКТУРА -- ТВЕРДОЕ ТЕЛО -- НЕСТЕХИОМЕТРИЧЕСКИЕ СОЕДИНЕНИЯ -- СОЕДИНЕНИЯ НЕСТЕХИОМЕТРИЧЕСКИЕ -- ТВЕРДЫЕ РАСТВОРЫ -- РАСТВОРЫ ТВЕРДЫЕ -- КАРБИД ВАНАДИЯ -- БЕСПОРЯДОК-ПОРЯДОК -- ФАЗОВЫЕ ПЕРЕХОДЫ -- ВАКАНСИЯ -- СВЕРХСТРУКТУРА -- V8C7
Аннотация: Рассмотрено применение атомно-вакансионного упорядочения для создания наноструктуры в нестехиометрических соединениях и твердых растворах замещения. На примере нестехиометрического карбида ванадия VC0.875 обсуждены условия формирования наноструктурированного состояния в дисперсных и объемных (bulk) образцах и особенности наноструктуры в них. Показано, что образование наноструктуры в карбиде VC0.875 обусловлено фазовым переходом беспорядок-порядок VC0.875 -> V8C7 первого рода, происходящим со скачкообразным изменением объема

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