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   V 18

    Valeeva, A. A.
    Electrical Conductivity and Magnetic Susceptibility of Titanium Monoxide / A. A. Valeeva, A. A. Rempel, A. I. Gusev // JETP Letters. - 2001. - Vol. 73, № 11. - P. 621-625 : il. - Bibliogr. : p. 625 (24 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВЕРХПРОВОДИМОСТЬ -- СВОЙСТВА МАГНИТНЫЕ -- МОНООКСИД ТИТАНА
Аннотация: Conductivity and magnetic susceptibility of disordered cubic titanium monoxide TiOy (0.920<= y <= 1.262) are studied. Temperature dependences of the conductivity of TiOy monoxides with y <= 1.069 are described by the Bloch–Grüneisen function with Debye temperature 400–480 K, and temperature dependences of the susceptibility include Pauli paramagnetism of conduction electrons. The behavior of conductivity and susceptibility of TiOy with y>= 1.087 is typical of semiconductors with nondegenerate charge carriers obeying Boltzmann statistics. The band gap DeltaE between the valence and conduction bands of TiOy (y>= 1.087) is 0.06–0.17 eV, and effective mass of charge carriers is equal to 7–14 electron masses

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   O-17


    Observation of Structural Vacancies / A. A. Valeeva, G. Tang, A. I. Gusev, A. A. Rempel // JETP Letters. - 2003. - Vol. 77, № 1. - P. 25-29 : il. - Bibliogr. : p. 29 (14 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТРУКТУРА КРИСТАЛЛИЧЕСКАЯ -- МОНООКСИД ТИТАНА -- НЕСТЕХИОМЕТРИЯ
Аннотация: A method using the atom–vacancy ordering phenomenon for the visualization of structural vacancies in crystals was suggested and implemented. The ordered nonstoichiometric titanium monoxide Ti5O5 was taken as the object of investigation, because the structural vacancies in this compound can be observed due to the formation of continuous vacancy channels in certain crystallographic directions. The structural vacancies in the specially oriented sample of ordered titanium monoxide were directly observed by high-resolution transmission electron microscopy with a magnification of 4x10(6)

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   R 42

    Rempel, A. A.
    Magnetic Properties of a Monocrystalline Quasicrystal in the Al–Pd–Mn System / A. A. Rempel, S. Z. Nazarova, A. I. Gusev // JETP Letters. - 2000. - Vol. 72, № 3. - P. 144-147 : il. - Bibliogr. : p. 147 (11 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВОЙСТВА МАГНИТНЫЕ -- КВАЗИКРИСТАЛЛЫ -- Al–Pd–Mn
Аннотация: Magnetic susceptibility of a monocrystalline icosahedral Al70.2Pd21.3Mn8.5 quasicrystal was measured over the temperature range from 4 to 1100 K. The susceptibility was found to include the temperature-independent diamagnetic contribution, the temperature-dependent Curie’s contribution, and the contribution from the Pauli paramagnetism of an electron system with energy gap. An analysis of the low-temperature susceptibility revealed the presence of about 0.008% of ions with magnetic moment 4mB in the quasicrystal at 4 K. It is assumed that the ions with uncompensated magnetic moments appear near the structural vacancies in the quasicrystal lattice. The energy gap between the valence and conduction bands is estimated at D = 0.64 eV, and the effective mass of charge carriers is equal to approximately 70 electron masses

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   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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   V 18

    Valeeva, A. A.
    Two-Sublattice Ordering in Titanium Monoxide / A. A. Valeeva, A. A. Rempel, A. I. Gusev // JETP Letters. - 2000. - Vol. 71, № 11. - P. 460–464 : il. - Bibliogr. : p. 464 (15 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ТИТАНА -- НЕСТЕХИОМЕТРИЯ
Аннотация: The disordered and ordered structures of nonstoichiometric titanium monoxide TixOz=~TiOy (y = z/x) containing structural vacancies simultaneously in the nonmetallic and metallic sublattices were studied. In the stoichiometry range from TiO0.9 to TiO1.1, an ordered monoclinic phase [space group C2/m (A12m/1)] of the Ti5O5 type is formed in the TiOy monoxide at temperatures below 1300 K. The disorder–order TiOy–Ti5O5 phase-transition channel involves Lifshitz {k10} and non-Lifshitz {k4} and {k11} star rays. The ordering proceeds as a first-order phase transition with a decrease in the volume of the basal cubic lattice. The titanium and oxygen distribution functions in the metallic and nonmetallic sublattices of titanium monoxide are calculated. The domain of allowed values is determined for the long-range order parameter

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   R 42

    Rempel, A. A.
    Identification of Structural Vacancies in Carbides, Oxides, and Sulfides by Doppler Broadening of the Gamma-Ray Line / A. A. Rempel, A. A. Valeeva, N. S. Kozhevnikova // JETP Letters. - 2010. - Vol. 92, № 3. - P146-150 : il. - Bibliogr. : p. 150 (9 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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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   K 76

    Kostenko, M. G.
    Relationship between Short- and Long-Range Orders in Nonstoichiometric Titanium Monoxide (TiOy) / M. G. Kostenko, A. A. Valeeva, A. A. Rempel // Journal of Experimental and Theoretical Physics. - 2010. - Vol. 111, № 5. - P786-795 : il. - Bibliogr. : p. 794 (9 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- МОНООКСИД ТИТАНА
Аннотация: The relationship between the short and long range orders in various phases of nonstoichiometric titanium monoxide (TiOy) has been analyzed for the first time. The types of the local environment of lattice sites in the metal and nonmetal (oxygen) sublattices of Ti5O5, Ti3O2, Ti2O3, and Ti4O5 superstructures are described. It is established that, in phases where ordering takes place simultaneously in both sublattices, all parameters of the superstructural short range order determining the positions of atoms and vacancies in the first three coordination spheres can be uniquely expressed via the long range order parameters. If the ordering takes place only in one sublattice, then five of the six short range order parameters vanish. It is shown that, using data on the maximum absolute values of six short range order parameters and on the fractions of occupied atomic positions in titanium and oxygen sublattices, it is possible to predict the type of ordered phase expected to form in the nonstoichiometric titanium monoxide TiOy

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   V 92

    Vorokh, A. S.
    Direct Space Visualization of the Short and “Average” Long Range Orders in the Noncrystalline Structure of a Single Cadmium Sulfide Nanoparticle / A. S. Vorokh, A. A. Rempel // JETP Letters. - 2010. - Vol. 91, № 2. - P100-104 : il. - Bibliogr. : p. 104 (16 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОЧАСТИЦЫ -- СУЛЬФИД КАДМИЯ
Аннотация: A method has been proposed for identifying the noncrystalline structure of CdS nanoparticles in the direct space by interpreting an image obtained by high resolution transmission electron microscopy. The short and average long range orders and microstrains in the disordered close packed structure of the CdS nanoparticle have been visualized. It has been shown that the direct space image of the average lattice with the space group P6 appears due to the moiré effect in the noncrystalline structure

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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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10.

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   S 12

    Sadovnikov, S. I.
    New Crystalline Phase in Thin Lead Sulfide Films / S. I. Sadovnikov, A. I. Gusev, A. A. Rempel // JETP Letters. - 2009. - Vol. 89, № 5. - P238-243 : il. - Bibliogr. : p. 243 (23 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА -- ТОНКИЕ ПЛЕНКИ -- СУЛЬФИД СВИНЦА
Аннотация: The crystal structure of thin lead sulfide (PbS) films fabricated by hydrochemical deposition is studied by X ray diffraction analysis. It is established that both the synthesized PbS films and the same films annealed in the temperature interval of 293–423 K have a cubic (space group Fm m) crystal structure different from the B1 type structure. In this structure, sulfur (S) atoms are located not only in positions 4(b) (octahedral interstices of the face centered sublattice of lead (Pb) atoms) but also in positions 8(c), i.e., in tetrahedral interstices. The occupations of positions 4(b) and 8(c) by S atoms are ~0.84 and ~0.08, respectively. Long range order in the location of S atoms in positions of each type is absent, but correlations may be present. The new revealed structure of PbS films remains stable under a prolonged annealing in the temperature interval from 293 to 423 K

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11.

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   R 42

    Rempel, A. A.
    ZrC Segregation to the Surface of Dilute Solid Solutions of Zirconium Carbide in Niobium Carbide / A. A. Rempel, A. I. Gusev // Inorganic Chemistry. - 2001. - Vol. 37, № 10. - P. 1024-1029 : il. - Bibliogr. : p. 1028-1029 (23 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РАСТВОРЫ ТВЕРДЫЕ -- КАРБИД НИОБИЯ -- КАРБИД ЦИРКОНИЯ -- СЕГРЕГАЦИЯ
Аннотация: Precipitation of crystalline ZrC in the surface region of dilute ZrC–NbC solid solutions (<1.0 mol % ZrC) was revealed by electron microscopy, x-ray microanalysis, laser mass spectrometry, and x-ray diffraction. The ZrC precipitation was shown to be a consequence of the diffusional decomposition of the dilute Zr1 – xNbxC solid solutions. The boundaries of the solid-miscibility gap in the ZrCy–NbCy system were calculated. The segregation energy of zirconium carbide was estimated at –33.3 kJ/mol

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12.

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   G 96

    Gusev, A. I.
    X-ray Diffraction Study of the Nanostructure Resulting from Decomposition of (ZrC)1 – x(NbC)x Solid Solutions / A. I. Gusev, A. A. Rempel // Inorganic Materials. - 2003. - Vol. 39, № 1. - P. 43-46 : il. - Bibliogr. : p. 46 (14 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАРБИД ЦИРКОНИЯ -- КАРБИД НИОБИЯ -- РАСТВОРЫ ТВЕРДЫЕ
Аннотация: Solid-state decomposition of nearly equimolar ZrC–NbC solid solutions was studied by x-ray diffraction. The results demonstrate that annealing broadens the diffraction peaks from the solid solutions. Analysis of the peak width as a function of the diffraction angle indicates that the broadening is due to the decomposition of the solid solution into two coherent isostructural (B1) phases close in lattice parameter (0.4573 and 0.4561 nm) and the formation of nanometer-sized (~ .70 nm) grains. The nanostructure remains stable during long-term (100 to 700 h) annealing between 670 and 1270 K

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13.

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   V 18

    Valeeva, A. A.
    Ordering of Cubic Titanium Monoxide into Monoclinic Ti5O5 / A. A. Valeeva, A. A. Rempel, A. I. Gusev // Inorganic Materials. - 2001. - Vol. 37, № 6. - P. 603-612 : il. - Bibliogr. : p. 611-612 (30 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ТИТАНА -- НЕСТЕХИОМЕТРИЯ
Аннотация: The structures of ordered and disordered cubic TixOz= TiOy (y = z/x) phases containing both Ti and O vacancies were studied by x-ray diffraction. The results demonstrate that annealing TiOy with y = 0.9–1.1 below 1300 K leads to the formation of a monoclinic ordered Ti5O5 phase (sp. gr. C2/m (A12m/1)). Symmetry analysis of the monoclinic Ti5O5 superstructure indicates that the TiOy–Ti5O5 ordering transition is defined by the {k10} Lifshits and {k4} and {k1} non-Lifshits wavevector manifolds. The ordering is shown to be a firstorder transition accompanied by a decrease in the unit-cell volume of the parent lattice. The Ti and O distribution functions in titanium monoxide are calculated, and the Ti- and O-site near-neighbor environments in the monoclinic Ti5O5 superstructure are identified. The region of possible long-range-order parameters is outlined

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14.

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   O-69


    Ordering of Structural Vacancies in Vanadium Monoxide of Substoichiometric Composition / D. A. Davydov, S. Z. Nazarova, A. A. Valeeva, A. A. Rempel // Bulletin of the Russian Academy of Sciences: Physics. - 2007. - Vol. 71, № 5. - P. 677-680 : il. - Bibliogr. : p. 680 (10 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТРУКТУРНЫЕ ВАКАНСИИ -- МОНООКСИД ВАНАДИЯ -- СТЕХИОМЕТРИЯ
Аннотация: The order–disorder phase transition in vanadium monoxide of substoichiometric compositions VO y has been studied for the first time in situ by the Faraday method with a pendulum magnetic balance of the Domenically type. A minimum is found on the temperature dependence of the magnetic susceptibility of vanadium monoxide of different compositions at a temperature of about 700 K. X-ray diffraction analysis performed before and after measuring the magnetic susceptibility confirmed the change in the structure of vanadium monoxide and the possibility of atom–vacancy processes upon cooling and heating of the samples

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2007, V. 71, N 5, P. 677-680.pdf
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15.

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   V 18

    Valeeva, A. A.
    Electrokinetic and Magnetic Properties of Cubic Titanium Monoxide with a Double-Defect Structure / A. A. Valeeva, A. A. Rempel, A. I. Gusev // Doklady Physics. - vol. 47, № 1. - P. 39-43 : ил. - Bibliogr. : p. 43 (15 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВОЙСТВА ЭЛЕКТРОКИНЕТИЧЕСКИЕ -- СВОЙСТВА МАГНИТНЫЕ -- МОНООКСИД ТИТАНА -- ПРОВОДИМОСТЬ

\\\\Expert2\\nbo\\Doklady Physics\\2002, V.47, N 1, p. 39-43.pdf
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16.

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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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17.

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   M 65


    Microstructure and Microhardness of Vanadium Oxides in the Range VO0.57-VO1.29 / A. A. Valeeva, D. A. Davydov, S. V. Rempel, A. A. Rempel // Inorganic Materials. - 2009. - Vol. 45, № 8. - P. 905-909 : il. - Bibliogr. : p. 909 (16 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МИКРОСТРУКТУРА -- МИКРОТВЕРДОСТЬ -- ОКСИД ВАНАДИЯ
Аннотация: X-ray diffraction and optical microscopy data are presented which demonstrate that substoichiometric vanadium oxide (VO0.57–VO0.97) consists of a cubic phase with the B1 structure (sp. gr.Fm m) and an ordered monoclinic phase of composition V14O6(sp. gr.C2/m). The content of the latter phase decreases with increasing oxygen content. The superstoichiometric vanadium oxide VO1.29 is shown to contain trace amounts of V52O64. Vickers microhardness data for nonstoichiometric vanadium oxides in the range VO0.57–VO1.29 show that, with increasing oxygen content, their HV has a tendency to decrease, from 18 to 12 GPa. Their microhardness is shown for the first time to have a maximum near the stoichiometric composition VO1.00

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18.

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   K 93

    Kurlov, A. S.
    Effect of WC Nanoparticle Size on the Sintering Temperature, Density, and Microhardness of WC–8 wt % Co Alloys / A. S. Kurlov, A. A. Rempel // Inorganic Materials. - 2009. - Vol. 45, № 4. - P. 380-385 : il. - Bibliogr. : p. 385 (10 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОЧАСТИЦЫ -- КАРБИД ВОЛЬФРАМА -- МИКРОТВЕРДОСТЬ -- КОБАЛЬТ -- СПЛАВЫ
Аннотация: Using X-ray diffraction, scanning electron microscopy, and density measurements, we have studied the effect of WC particle size (20 to 150 nm) on the optimal sintering temperature of the WC–8 wt % Co alloy and the effect of sintering temperature (800–1600°C) on its phase composition, density, and microhardness. The results indicate that, during sintering of the starting powder mixture, the first to form is the ternary carbide phase Co6W6C. At sintering temperatures of 1100°C and above, this phase reacts with carbon to form Co3W3C. Sintering above 1000°C leads to the formation of a cubic solid solution of tungsten carbide in cobalt, β-Co(WC), along with the ternary carbide phases. The density and microhardness of the alloy have been measured as functions of sintering temperature. The use of WC nanopowder has been shown to reduce the optimal sintering temperature of the WC–Co alloy by about 100°C

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19.

Инвентарный номер: нет.

   B 41

    Belova, N. S.
    PbS Nanoparticles: Synthesis and Size Determination by X-ray Diffraction / N. S. Belova, A. A. Rempel // Inorganic Materials. - 2004. - Vol. 40, № 1. - P. 3-10 : il. - Bibliogr. : p. 9-10 (31 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СУЛЬФИД СВИНЦА -- НАНОЧАСТИЦЫ -- ДИФРАКЦИЯ РЕНТГЕНОВСКАЯ
Аннотация: PbS particles down to 60 nm in size are prepared by chemical precipitation from aqueous solutions. An x-ray diffraction procedure is described for determining the particle size and atomic structure. The PbS particles precipitating in the solution bulk are shown to be monocrystalline. Reducing the particle size of PbS from 300 to 60 nm increases the rms atomic displacements (by 30%) and lattice strain (by 0.1%) in the particles. The lattice parameter of PbS is found for the first time to increase with decreasing particle size

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20.

Инвентарный номер: нет.

   D 26

    Davydov, D. A.
    Refinement of the V–O Phase Diagram in the Range 25–50 at % Oxygen / D. A. Davydov, A. A. Rempel // Inorganic Materials. - 2009. - Vol. 45, № 1. - P. 47-54 : il. - Bibliogr. : p. 53-54 (36 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВАНАДИЯ -- ФАЗОВЫЕ ДИАГРАММЫ
Аннотация: The boundaries of the V14O6+VxOz two-phase region in the V–O system at temperatures from ~1050 to ~1650 K have been determined experimentally. The V–O phase diagram has been refined in the range 25–50 at % oxygen using structural and microstructural data for vanadium oxides containing less than 50 at % oxygen in conjunction with earlier results. The possibility of ordering of cubic vanadium monoxide has been examined

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