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Общее количество найденных документов : 88
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1.

Вид документа : Статья из журнала
Шифр издания : 54/E 58
Автор(ы) : Enyashin A. N., Ivanovskii A. L.
Заглавие : Structural, Elastic, and Electronic Properties of New Superhard Isotropic Cubic Crystals of Carbon Nanotubes
Место публикации : JETP Letters. - 2008. - Vol. 87, № 6. - С. 321-325: il.
Примечания : Bibliogr. : p. 325 (30 ref.)
ISSN: 0021-3640
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нанотрубки карбоновые--изотропные кубические кристаллы
Аннотация: The models of new isotropic cubic crystals of single-layered carbon nanotubes are proposed. The structural, elastic, and electronic properties and the energies of formation of these crystals were calculated using the density functional-based tight binding (DFTB) method. The crystals proposed were found to exhibit extreme compression moduli (550–650 GPa) and a minimum compressibility (0.0018–0.0015 GPa–1); in this case, the type of conduction of the parent nanotubes was retained. For this reason, the above crystals are of interest for the development of new superhard materials with controllable electrophysical properties
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2.

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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3.

Вид документа : Статья из журнала
Шифр издания : 54/D 58
Автор(ы) : Ivanovskaya V. V., Zobelli A., Seifert G., Ivanovskii A. L.
Заглавие : Dimensionally, Morphologically, and Thermally Induced Phase Transformations in Boron–Nitrogen Nanowires
Место публикации : JETP Letters. - 2007. - Vol. 85, № 12. - С. 626-631: il.
Примечания : Bibliogr. : p. 630-631 (36 ref.)
ISSN: 0021-3640
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): наноматериалы--нитрид бора
Аннотация: Structural, thermal, electronic, and energetic properties of cubic boron nitride (BN) nanowires are studied using the density-functional tight-binding method. The effect of the total or partial rearrangement of the cubic structure of nanowires into the hexagonal one depending on the size, morphology, and thermal treatment of the starting wire has been revealed. As distinct from the known homogeneous carbon diamond-like nanowires, stable BN nanowires are two-phase systems whose “shell” has a hexagonal structure and “core” has a cubic structure. The changes in the electronic properties of BN nanowires induced by their structural transformations are discussed. It is shown that boron–nitrogen nanowires can exhibit both semiconducting and metallic properties
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4.

Вид документа : Статья из журнала
Шифр издания : 54/B 17
Автор(ы) : Bakhteeva Yu. A., Podval'naya N. V., Volkov V. L.
Заглавие : Gas-Sensing Properties of Nanostructured MxV2O5 (M = Na, K, Rb, Cs) Oxides
Место публикации : Inorganic Materials. - 2010. - Vol. 46, № 10. - С. P. 1112-1114: il.
Примечания : Bibliogr. : p. 1114 (7 ref.)
ISSN: 0020-1685
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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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5.

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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6.

Вид документа : Статья из журнала
Шифр издания : 54/R 42
Автор(ы) : Rempel A. A., Valeeva A. A., Kozhevnikova N. S.
Заглавие : Identification of Structural Vacancies in Carbides, Oxides, and Sulfides by Doppler Broadening of the Gamma-Ray Line
Место публикации : JETP Letters. - 2010. - Vol. 92, № 3. - С. 146-150: il.
Примечания : Bibliogr. : p. 150 (9 ref.)
ISSN: 0021-3640
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): структурные вакансии--карбиды--оксиды--сульфиды
Аннотация: A method has been developed to identify the sublattices of a crystal structure in which there are atomic vacancies. This method is based on determining the chemical environment of vacancies and is implemented using the method of the positron annihilation by measuring the momentum distribution of core electrons. To determine the characteristic momentum distribution of electrons, a special two-detector spectroscopy is used, which ensures measurements of Doppler broadening of the annihilation gamma ray line with a high (up to 106) signal-to-noise ratio. To test the method, vacancies in irradiated silicon carbide (6H SiC), sintered nonstoichiometric titanium carbides (TiCy) and titanium monoxides (TiOy), and chemically deposited lead and cadmium sulfides (PbS and CdS) have been identified. Vacancies in the carbon and silicon sublattices have been identified in silicon carbide after irradiation by low- and high-energy electrons, respectively. Vacancies in the nonmetal sublattice have been identified in TiCy. Vacancies in the metal sublattice have been identifiedin TiCy, as well as in PbS and CdS
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7.

Вид документа : Статья из журнала
Шифр издания : 54/I-70
Автор(ы) : Kuznetsov M. V., Borisov S. V., Shepatkovskii O. R., Veksler Yu. G., Kozhevnikov V. L.
Заглавие : Investigation of TiC–C Coatings by X-Ray Photoelectron Spectroscopy
Место публикации : Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques. - 2009. - Vol. 3, № 3. - С. 331-337: il.
Примечания : Bibliogr. : p. 337 (14 ref.)
ISSN: 1027-4510
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): карбид титана--рентгеновская фотоэлектронная спектроскопия--покрытия
Аннотация: Titanium carbide-based coatings deposited by arc-technology in C2H2/Ar atmosphere were studied by X-ray photoelectron spectroscopy. It was found that, in addition to the cubic phase of TiCxOy oxycarbide, the films contain carbon in the amorphous, presumably graphite-like state. In carbon C1s spectra, bands at 282.0, 284.4, and 286.0 eV correspond to the TiCx state, amorphous carbon, and C–C bonds, respectively. The maximum at 283.0 eV was interpreted as the C state in titanium carbide nanoforms, i.e., Ti14C13 clusters or Ti8C14 carbohedra. The phase ratio was varied by coating deposition conditions, i.e., TiC/a-C deposition by Ti cathode sputtering in C2H2/Ar, and composite Ti/C target sputtering in Ar and C2H2/Ar. When using the Ti cathode and C2H2/Ar gas mixture, the ratio of carbide and amorphous a-C phases was estimated as 1 : 1; the surface layer ~15 nm thick was enriched with amorphous carbon. It was assumed that TiC/ a-C composite coatings with an additional a -C film on the surface would have an increased stability in reaction media and good biocompatibility
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8.

Вид документа : Статья из журнала
Шифр издания : 54/R 42
Автор(ы) : Rempel A. A., Gusev A. I.
Заглавие : Preparation of Disordered and Ordered Highly Nonstoichiometric Carbides and Evaluation of Their Homogeneity
Место публикации : Physics of the Solid State. - 2000. - Vol. 42, № 7. - С. 1280-1286: il.
Примечания : Bibliogr. : p. 1286 (22 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нестехиометрия--карбиды--гомогенность
Аннотация: The features of solid-phase synthesis of highly nonstoichiometric carbides with controlled concentration of structural vacancies in the carbon sublattice have been considered. Four main stages are distinguished in the synthesis of nonstoichiometric carbides by the solid-phase sintering technique. It is shown that the inhomogeneity of highly nonstoichiometric compounds leads to the broadening of diffraction reflections. The analytical relation between the broadening and the inhomogeneity is obtained for the first time, and the method based on diffraction measurements is proposed for the quantitative evaluation of the degree of homogeneity of nonstoichiometric compounds. As an illustration of the advanced approach, the degree of homogeneity of nonstoichiometric niobium carbide is evaluated from the experimental data on the width of x-ray diffraction peaks.The heat treatment conditions providing the preparation of nonstoichiometric Group IV and V transition metal carbides in the disordered and ordered states are determined
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9.

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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10.

Вид документа : Статья из журнала
Шифр издания : 54/G 96
Автор(ы) : Gusev A. I.
Заглавие : Sequence of Phase Transformations in the Formation of Superstructures of the M6C5 Type in Nonstoichiometric Carbides
Место публикации : Journal of Experimental and Theoretical Physics. - 2009. - Vol. 109, № 3. - С. 417-433: il.
Примечания : Bibliogr. : p. 432-433 (46 ref.)
ISSN: 1063-7761
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): фазовый переход--нестехиометрия--карбиды
Аннотация: A symmetry analysis has been made of monoclinic and trigonal superstructures of the M6C5 type, which are formed in nonstoichiometric cubic carbides MCy with a B1 structure. Channels of disorder–order transitions MCy -M6C5 have been revealed, and the distribution functions of carbon atoms in the M6C5 superstructures have been calculated. The atomic–vacancy ordering in nonstoichiometric cubic carbides of vanadium VCy and niobium NbCy has been investigated using neutron diffraction and X ray diffraction analyses. It has been shown that, as the temperature decreases, the Group V transition metal carbides MCy can undergo two physically admissible sequences of transformations associated with the formation of M6C5 phases
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