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Общее количество найденных документов : 87
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1.
Инвентарный номер: нет.
   
   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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2.
Инвентарный номер: нет.
   
   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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3.
Инвентарный номер: нет.
   
   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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4.
Инвентарный номер: нет.
   
   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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5.
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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6.
Инвентарный номер: нет.
   
   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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7.
Инвентарный номер: нет.
   
   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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8.
Инвентарный номер: нет.
   
   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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9.
Инвентарный номер: нет.
   
   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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10.
Инвентарный номер: нет.
   
   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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