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 1-10    11-20   21-30   31-40   41-45 
1.
Инвентарный номер: нет.
   
   C 74


   
    Concentration Phase Transition near the StoichiometricComposition of Vanadium Monoxide VO1.00 / D. A. Davydov, S. Z. Nazarova, A. A. Valeeva, A. A. Rempel // Bulletin of the Russian Academy of Sciences: Physics. - 2008. - Vol. 72, № 8. - P.1090-1093 : il. - Bibliogr. : p. 1093 (16 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗОВЫЙ ПЕРЕХОД -- СТЕХИОМЕТРИЯ -- МОНООКСИД ВАНАДИЯ
Аннотация: The concentration dependences of the magnetic susceptibility and lattice parameter of cubic vanadium monoxide have been measured in the composition range from VO0.81 to VO1.07. Near the stoichiometric composition VO1.00, the concentration dependences exhibit a stepwise increase in the specific magnetic susceptibility??(by approximately 0.7 X 10(-6) cm(3)/g) and lattice constant (by about 0.002 nm). These effects can be??related to the concentration phase transition, which occurs in vanadium monoxide with a change from a substoichiometric composition to superstoichiometric. At such a transition, along with a decrease in the concentration of oxygen vacancies, tetrahedrally coordinated vanadium interstitials are formed, as a result of which the??B1 structure changes to a more complex cubic phase structure with the same space group??Fm-3m

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2008, V. 72, N 8, P. 1090-1093.pdf
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2.
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   E 27


   
    Effect of Electron Correlations on the Electronic Structure and Magnetic Properties of the Perovskite-Like High Pressure Phase ErCu3V4O12 / M. V. Petrik, N. I. Medvedeva, N. I. Kadyrova, Yu. G. Zainulin, A. L. Ivanovskii // Physics of the Solid State. - 2010. - vol. 52, № 8. - P1709-1713 : il. - Bibliogr. : p. 1713 (22 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРОВСКИТЫ -- ЭЛЕКТРОННАЯ КОРРЕЛЯЦИЯ -- СТЕХИОМЕТРИЯ
Аннотация: The electronic structure and magnetic properties of double perovskite ErCu3V4O12 have been investigated in the framework of the projector augmented wave method. It has been shown that the electron correlations play an important role: the calculations in the one electron approximation predict that the ground state of ErCu3V4O12 is a magnetic metallic state, while with the inclusion of electron–electron correlations, it is a ferrimagnetic semimetallic state. It has been found that the magnetic Cu–Cu and V–V couplings are ferromagnetic and that the Cu–V magnetic coupling is antiferromagnetic

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3.
Инвентарный номер: нет.
   
   E 27


   
    Effects of Structural Disorder in Lithium Manganite and Titanate Oxides / Yu. G. Chukalkin, A. E. Teplykh, D. G. Kellerman, V. S. Gorshkov // Physics of the Solid State. - 2010. - vol. 52, № 5. - P1006-1009 : il. - Bibliogr. : p. 1009 (11 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАНГАНИТ ЛИТИЯ -- ТИТАНАТЫ -- СТЕХИОМЕТРИЯ
Аннотация: The structures and magnetic states of stoichiometric lithium manganite LiMn2O4 and manganites and titanates Li1.33Mn1.67O4 and Li1.33Ti1.67O4 with excess lithium in both the initial (as-synthesized) state and after irradiation by fast (Eeff ≥ 1 MeV) neutrons with a fluence of 2 × 1020 cm–2 have been studied using neutron diffraction, X-ray diffraction, and magnetic methods. It has been established that the irradiation brings about a noticeable redistribution of manganese, titanium, and lithium cations over nonequivalent tetrahedral (8a) and octahedral (16d) positions of a spinel lattice. This structural disorder causes a radical change in the physical properties of the materials under study. The charge order existing in the initial LiMn2O4 sample is destroyed. There arises a strong intersublattice indirect exchange interaction Mn(8a)–O–Mn(16d). The disorder is accompanied by the antiferromagnet–ferrimagnet (LiMn2O4) and paramagnet–ferrimagnet (Li1.33Mn1.67O4) magnetic transitions

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4.
Инвентарный номер: нет.
   
   E 43


   
    Electronic Structure and Magnetic States of Crystalline and Fullerene-Like Forms of Nickel Dichloride NiCl2 / A. N. Enyashin, N. I. Medvedeva, Yu. E. Medvedeva, A. L. Ivanovskii // Physics of the Solid State. - 2005. - Vol. 47, № 3. - P527-530 : il. - Bibliogr. : p. 530 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДИХЛОРИД НИКЕЛЯ -- ФУЛЛЕРЕНЫ -- ФЕРРОМАГНЕТИКИ -- СТЕХИОМЕТРИЯ
Аннотация: The electronic structure and magnetic properties of the crystalline and fullerene-like forms of nickel dichloride NiC² are investigated in the framework of the local spin density functional theory. It is demonstrated that the band gap can be reproduced in the energy band spectrum of the NiCl² compound with inclusion of the magnetic ordering in the calculation of the band structure. The metamagnetic nature of the NiCl² dichloride (i.e., the transition from an antiferromagnetic phase to a ferromagnetic phase in a weak magnetic field) is explained in terms of a small difference (0.025 eV/cell) between the total energies of the ferromagnetic and antiferromagnetic phases. Polyhedral three-shell nanoparticles of the NiCl² compound exhibit magnetic properties (the magnetic moment of nickel lies in the range 2.0–2.3 µβ). For isostructural nanoparticles of the FeCl² dichloride, the magnetic moment of iron is larger and falls in the range 4.2–4.5 µβ, whereas nanoparticles of the CdCl² dichloride are found to be nonmagnetic. The results of analyzing the interatomic interactions indicate that the composition of fullerene-like nanoparticles of the dichlorides under investigation can deviate from the 1 : 2 stoichiometric composition

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5.
Инвентарный номер: нет.
   
   G 96


    Gusev, A. I.
    Nitrogen Partial Pressure of Stoichiometric and Nonstoichiometric Titanium, Vanadium and Niobium Nitrides and Carbonitrides [] / A. I. Gusev // Physica status solidi B. - 1998. - V. 209, N 2. - С. 267-286 . - ISSN 0370-1972
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДАВЛЕНИЕ АЗОТА -- ДАВЛЕНИЕ ПАРЦИАЛЬНОЕ -- ПАРЦИАЛЬНОЕ ДАВЛЕНИЕ -- СТЕХИОМЕТРИЯ -- НЕСТЕХИОМЕТРИЯ -- НИТРИД ТИТАНА -- НИТРИД ВАНАДИЯ -- НИТРИД НИОБИЯ -- КАРБОНИТРИД ТИТАНА -- КАРБОНИТРИД ВАНАДИЯ -- КАРБОНИТРИД НИОБИЯ -- ТИТАН -- ВАНАДИЙ -- НИОБИЙ -- Ti -- V -- Nb

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6.
Инвентарный номер: нет.
   
   I-76


   
    Ion State of Atoms and the Properties of Perovskite-Like Compound CaCu3V4O12 / V. L. Volkov, N. I. Kadyrova, G. S. Zakharova, M. V. Kuznetsov, N. V. Podval'naya, K. N. Mikhalev, Yu. G. Zainulin // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 3. - P329-333 : il. - Bibliogr. : p. 333 (16 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРОВСКИТОПОДОБНЫЕ СОЕДИНЕНИЯ -- СТЕХИОМЕТРИЯ
Аннотация: The binding energies and valence state of atoms in the perovskite-like compound CaCu3V4O12 have been determined using XPS spectroscopy. The stoichiometry of this phase is formulated as Ca2+Cu2+(V2(5+)V2(4+)O12). Under an air atmosphere, the phase interacts with water vapor and oxygen. As a result, Ca(OH)2 is formed on its surface, the Cu+ and V4+ ion concentrations decrease, and the Cu2+ and V5+ concentrations increase in association. Raman spectra show shortened cation–anion bond lengths and cation–anion–cation bond angles in CaCu3V4O12 compared to perovskite CuVO3; the two structures are alike. The electrical conductivity, magnetic susceptibility, thermal and sensor properties of CaCu3V4O12 in aqueous salt solutions have been studied

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7.
Инвентарный номер: нет.
   
   I-98


    Ivanovskii, A. L.
    Electronic Structure and Chemical Bonds in Titanium Dicarbide with Disordered C2 Dimers / A. L. Ivanovskii, N. I. Medvedeva, A. A. Sofronov // Russian Journal of Coordination Chemistry. - 2001. - Vol. 27, № 2. - P112-115 : il. - Bibliogr. : p. 114-115 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДИКАРБИД ТИТАНА -- СТЕХИОМЕТРИЯ
Аннотация: A quantum–chemical zone and cluster approaches were used to model the electronic energy spectrum and to study the chemical bond in a hypothetical phase of titanium dicarbide (TiC2) composed of C2 dimers as structural units. The effect of orientational disorder of the C2 dimers on the electronic structure and chemical stability of the dicarbide was investigated

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8.
Инвентарный номер: нет.
   
   I-98


    Ivanovskii, A. L.
    Electronic structure of silicon carbide containing superstoichiometric carbon / A. L. Ivanovskii, N. I. Medvedeva, G. P. Shveikin // Russian Chemical Bulletin. - 1999. - Vol. 48, № 3. - P612-615 : il. - Bibliogr. : p. 615 (9 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАРБИД КРЕМНИЯ -- СТЕХИОМЕТРИЯ
Аннотация: Electronic structure of superstoichiometric silicon carbide, β-SiCx>L0 , was studied by the self-consistent ab initio linearized "muffin-tin" orbital method. It is most likely that the formation of β-SiCx>1,0 occurs by replacement of silicon atoms by carbon atoms rather than by insertion of carbon atoms into interstitial lattice sites. The C → Si replacement is accompanied by lattice compression (the equilibrium lattice parameter for a superstoichiometric phase of composition Si0.75CI1.25 is -2% smaller than for SIC). In the presence of superstoichiometric carbon the type of interaction between silicon and carbon atoms changes and additional bonds characteristic of diamond are formed

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9.
Инвентарный номер: нет.
   
   K 31


    Kellerman, D. G.
    Structure, Properties, and Application of Lithium–Manganese Spinels / D. G. Kellerman, V. S. Gorshkov // Russian Journal of Electrochemistry. - 2001. - Vol. 37, № 12. - P1227-1236. - Bibliogr. : p. 1234-1236 (122 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЛИТИЙ-МАРГАНЦЕВЫЕ ШПИНЕЛИ -- СТЕХИОМЕТРИЯ
Аннотация: Literature data of the past 15 years on the physicochemical and electrochemical properties of Li– Mn spinels are reviewed. Physicochemical characteristics of stoichiometric and defected spinels, chemical deintercalation of lithium out of spinels, electrochemical processes in spinels, syntheses of spinels with improved electrochemical characteristics, and doped spinels are perused

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10.
Инвентарный номер: нет.
   
   K 46


   
    Kinetics of Domain Structure and Switching Currents in Single Crystals of Congruent and Stoichiometric Lithium Tantalate / V. Ya. Shur, E. V. Nikolaeva, E. I. Shishkin, V. L. Kozhevnikov, A. P. Chernykh // Physics of the Solid State. - 2002. - Vol. 44, № 11. - P2151-2156 : il. - Bibliogr. : p. 2156 (34 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТЕХИОМЕТРИЯ -- ТАНТАЛАТ ЛИТИЯ
Аннотация: A comparative analysis of polarization-switching kinetics in single crystals of congruent and stoichiometric lithium tantalate LiTaO3 is carried out by recording a sequence of instantaneous domain configurations (optical visualization of the evolution of the domain-structure) and the switching current simultaneously. A new mechanism of fast kinetics of domains in congruent lithium titanate due to the growth of steps formed during domain coalescence is discovered experimentally and studied with the help of computer simulation. Additional information on the domain kinetics in stoichiometric lithium tantalate is obtained on the basis of statistical analysis of the noise component of a switching current. A model is proposed for description of the jerky motion of domain walls

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