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1.
Инвентарный номер: нет.
   
   S 53


    Shein, I. R.
    Atomic models of non-stoichiometric layered diborides M1?xB2 (M = Mg, Al, Zr and Nb) from first principles / I. R. Shein, A. L. Ivanovskii // Physica C. - 2008. - Vol. 468. - P. 2224-2228 : il. - Bibliogr. : p. 2228 (43 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДИБОРИДЫ МЕТАЛЛОВ -- НЕСТЕХИОМЕТРИЯ -- СВОЙСТВА ЭЛЕКТРОННЫЕ
Аннотация: Two atomic models of non-stoichiometric metal diborides M1-xB2 are now assumed: (i) the presence of cation vacancies and (ii) the presence of "super-stoichiometric" boron which is placed in cation vacancy site. We have performed first principle total energy calculations using the VASP-PAW method with the generalized gradient approximation (GGA) for the exchange-correlation potential in a perspective to reveal the trends of their possible stable atomic configurations depending on the type of M cations (M = Mg, Al, Zr or Nb) and the type of the defects (metal vacancies versus metal vacancies occupied by??"super-stoichiometric"boron in forms of single atoms, dimers B2 or trimers B3). Besides we have estimated the stability of these non-stoichiometric states (on the example of magnesium–boron system) as depending on the possible synthetic routes, namely via solid-state reaction method, as well as in reactions between solid boron and Mg vapor; and between these reagents in gaseous phase. We demonstrate that the non-stoichiometric states such as B2 and B3 placed in metal sites may be stabilized, while the occupation of vacancy sites by single boron atoms is the most unfavorable

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2.
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   S 53


    Shein, I. R.
    Atomic models of non-stoichiometric layered diboridesM1-xB2 (M = Mg, Al, Zr and Nb) from first principles / I. R. Shein, A. L. Ivanovskii // arXiv.org, e-Print Archive, Condensed Matter. - 2008. - 15 pp. - Bibliogr. : p. 14-15 (43 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОДЕЛИРОВАНИЕ -- НЕСТЕХИОМЕТРИЯ -- ДИБОРИДЫ МЕТАЛЛОВ -- СВОЙСТВА ЭЛЕКТРОННЫЕ
Аннотация: Two atomic models of non-stoichiometric metal diborides M1-xB2 are now assumed: (i) thepresence of cation vacancies and (ii) the presence of “super-stoichiometric” boron which is placed in cation vacancy site. We have performed first principle total energy calculations using the VASP-PAW method with the generalized gradient approximation (GGA) for the exchangecorrelation potential in a perspective to reveal the trends of their possible stable atomic configurations depending on the type of M cations (M = Mg, Al, Zr or Nb) and the type of the defects (metal vacancies versus metal vacancies occupied by “super-stoichiometric” boron in forms of single atoms, dimers B2 or trimers B3). Besides we have estimated the stability of these non-stoichiometric states (on the example of magnesium-boron system) as depending on the possible synthetic routes, namely via solid state reaction method, as well as in reactions between solid boron and Mg vapor; and between these reagents in gaseous phase. We demonstrate that the non-stoichiometric states such as B2 and B3 placed in metal sites may be stabilized, while the occupation of vacancy sites by single boron atoms is the most unfavorable

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3.
Инвентарный номер: нет.
   
   B 22


   
    Band Structure and Properties of Polymorphic Modifications of Lower Tungsten Carbide W2C / D. V. Suetin, I. R. Shein, A. S. Kurlov, A. I. Gusev, A. L. Ivanovskii // Physics of the Solid State. - 2008. - Vol. 50, № 8. - P1420-1426 : il. - Bibliogr. : p. 1426 (20 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАРБИД ВОЛЬФРАМА -- ПОЛИМОРФНЫЕ МОДИФИКАЦИИ
Аннотация: The structural and electronic properties are investigated and the relative stabilities of all the known polymorphic modifications (α,β,γ,ε) of the lower tungsten carbide W2C are numerically estimated using the ab initio full-potential linearized augmented plane wave (FLAPW) method within the generalized gradient approximation (GGA) of the local spin density. The equilibrium parameters of the crystal lattices, the band structures, and the total and partial densities of states are determined for the first time within a unified approach. The energies of formation of the α,β,γ, and ε polymorphic modifications of the lower tungsten carbide [in the reactions W2C<-> 2W + C (graphite)] are calculated and used to discuss their relative stabilities

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4.
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   B 22


    Bannikov, V. V.
    Band structure, elastic and magnetic properties, and stability of antiperovskites MCNi3 (M = Y-Ag) according to FLAPW-GGA calculations [Текст] / V. V. Bannikov, I. R. Shein, A. L. Ivanovski // Physics of the Solid State. - 2007. - Vol. 49, № 9. - С. 1704-1714. - Библиогр. : с. 1713 (41 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АНТИПЕРОВСКИТЫ -- КАРБИДЫ -- МЕЖАТОМНОЕ ВЗАИМОДЕЙСТВИЕ
Аннотация: Using the full-potential linearized augmented plane wave method (FLAPW) and the WIEN2k software package, calculations of the band structure and the elastic and magnetic properties of the ternary antiperovskite carbides MCNi3, where M = Y, Zr,..., Ag (overall, nine compounds) are performed and the features of interatomic interactions in them are considered. Stability of these antiperovskite compounds depending on the 4d metal is discussed based on the calculated energies of formation of MCNi3 from the corresponding elements (according to the formal reaction M + C + 3Ni - MCNi3), and the conclusion is drawn that the YCNi3, ZrCNi3, and PdCNi3 antiperovskites can be synthesized. The obtained results are compared with the available data on known isostructural nickel-based carbides (antiperovskites MgCNi3, ZnCNi3)

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5.
Инвентарный номер: нет.
   
   E 58


    Enyashin, A. N.
    Calculation of the Electronic and Thermal Properties of C/BN Nanotubular Heterostructures / A. N. Enyashin, G. Seifert, A. L. Ivanovskii // Inorganic Materials. - 2005. - Vol. 41, № 6. - P. 595-603 : il. - Bibliogr. : p. 602-603 (42 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОТУБУЛЯРНЫЕ ГЕТЕРОСТРУКТУРЫ -- НИТРИД БОРА -- МОДЕЛИРОВАНИЕ
Аннотация: Modeling results are presented on the electronic, structural, and thermal properties of a (5,5)C@(17,0)BN-NT tubular heterostructure (a metal-like carbon nanotube inside a dielectric boron nitride nanotube) regarded as a prototype of nanocables. It is shown that the electronic properties of the nanocable remain unchanged up to about 3500 K. The properties of the nanocable are analyzed in comparison with those of a [C60]∞@(17,0)BN-NT peapod, a potential precursor to C/BN nanocables

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6.
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   C 51


   
    Chemical Shifts in the X-ray Emission Spectra of MgB2 and Their Correlation with the Electronic Structure [Текст] / N. I. Medvedeva, L. D. Finkelstein, S. N. Shamin, I. I. Lyakhovskaya, E. Z. Kurmaev // Physics of the Solid State . - 2004. - Vol. 46, № 11. - С. 1994-1997. - Библиогр. : с. 1997 (20 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
БОРИД МАГНИЯ -- РЕНТГЕНОВСКАЯ ЭМИССИЯ
Аннотация: The x-ray emission spectra of magnesium diboride MgB2 are measured. It is found that the Mg L2, 3 and B K a emission lines are shifted with respect to the spectra of the pure metals toward the low-energy range. The band calculations of the MgB2 diboride in the framework of the full-potential linearized muffin-tin orbital (LMTO) method demonstrate that the electron populations of the shells in both components of MgB2 are higher than those of pure metals. This increase in the electron populations is associated with the crystal contraction and manifests itself in low-energy shifts of the emission lines

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7.
Инвентарный номер: нет.
   
   Z 62


    Zhilyaev, V. A.
    Current status and potential for development of tungsten-free hard alloys [Text] / V. A. Zhilyaev, E. I. Patrakov, G. P. Shveikin // Institute of Physics. Conf. Ser. Science of Hard Materials. - 1986. - Chap. 11, 75. - P1063-1073
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ХИМИЯ -- БЕЗВОЛЬФРАМОВЫЕ ТВЕРДЫЕ СПЛАВЫ -- СПЛАВЫ

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8.
Инвентарный номер: нет.
   
   P 80


    Polyakov, E. V.
    Determination of Ionic to Colloid Form Ratio Chemical Extraction / E. V. Polyakov, G. N. Ilves, V. T. Surikov // Radiochemistry. - 2003. - Vol. 45, № 5. - P506-511 : il. - Bibliogr. : p. 510-511 (47 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОЛЛОИДНО-ХИМИЧЕСКАЯ ЭКСТРАКЦИЯ -- МИКРОКОМПОНЕНТЫ -- РАДИОАКТИВНЫЕ ЭЛЕМЕНТЫ
Аннотация: Colloid forms of a series of microcomponents were studied in aqueous solutions by the colloidal chemical extraction method in combination with ICP MS. The potential of this combined method for determination of the total fraction of the colloid species and distribution of microcomponents of stable and radioactive elements throughout colloid forms at their natural abundance in potable water is examined

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9.
Инвентарный номер: нет.
   
   M 46


    Medvedeva, N. I.
    Effect of Chromium on the Electronic Structure of the Cementite Fe3C / N. I. Medvedeva, L. E. Kar'kina, A. L. Ivanovskii // Physics of the Solid State. - 2006. - Vol. 48, № 1. - P15-19 : il. - Bibliogr. : p. 19 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ХРОМ -- ЭЛЕКТРОННАЯ СТРУКТУРА -- ЦЕМЕНТИТЫ
Аннотация: The effect of alloying of the cementite Fe3C with chromium on the band structure, atomic interactions, electric field gradients, and asymmetry parameters for iron nuclei is investigated using the self-consistent full-potential linear muffin-tin orbital (FPLMTO) method. An increase in the cohesive energy for the Fe3C–Cr system indicates an enhancement of the atomic interactions in the lattice of the cementite alloyed with chromium. It is found that the substitution of chromium for iron in the FeII positions containing eight equivalent iron atoms is energetically most favorable

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10.
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   E 27


   
    Effect of heat treatment on the electronic spectrum and mechanical properties of BeO ceramics [Text] / M. A. Gorbunova, V. S. Kiiko, A. A. Sofronov, Yu. N. Makurin, A. L. Ivanovskii // Inorganic Materials. - 2006. - Vol. 42, № 10. - P1168-1170. - Библиогр. : с. 1170 (17 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТЕРМООБРАБОТКА -- ОКСИД БЕРИЛЛИЯ -- КЕРАМИКА
Аннотация: The full-potential linear mufin-tin orbital method with a generalized gradient approximation, in conjunction with experimental structural data obtained for BeO ceramics during heatingncooling cycles, was used to analyze the effect of heat treatment on the electronic structure of BeO and to evaluate the thermal expansion coefficients and bulk modulus of BeO ceramics. According to the calculation results, BeO remains a widegap semiconductor in the range 80n300 K, and its band gap varies by no more than ~0.02 eV. The bulk modulus of BeO ceramics (~170 GPa) is 18n25% lower than that of single-crystal BeO.

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