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 1-10    11-20   21-28 
1.
Инвентарный номер: нет.
   
   A 10


   
    A Study of the Cerium Valence in Multinary Garnet Compounds / N. N. Efremova, N. I. Lobachevskaya, V. I. Nefedov, L. D. Finkel’shtein, V. G. Bamburov // Russian Journal of Inorganic Chemistry. - 2006. - Vol. 51, № 2. - P277-280 : il. - Bibliogr. : p. 280 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЦЕРИЙ -- ГРАНАТЫ МНОГОКОМПОНЕНТНЫЕ
Аннотация: The valence state of cerium ions in the ferrite garnets {Gd1.96BiCe0.04}Ga1.2Fe3.8O12,{GdBiCe 0.5Ca0.5}Ga1.2Fe3.8O12, and {GdBiCe0.25Ca0.25}Ga1.2Fe.8O12 was studied by L3 X-ray absorption spectroscopy. Information on the change in the chemical bonding in ferrite garnets upon the violation of lattice completeness was obtained from the shifts of absorption maxima

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2.
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   B 22


    Bannikov, V. V.
    Double Exchange in Cubic Crystals with Pairs of Exchange-Coupled Mixed-Valence 3d3 –3d4 Ions / V. V. Bannikov, V. Ya. Mitrofanov // Physics of the Solid State. - 2005. - Vol. 47, № 8. - P1532-1534 : il. - Bibliogr. : p. 1534 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- 3-D ИОНЫ -- KZnF3
Аннотация: Specifics of the exchange interaction in mixed-valence Cr2+–Cr3+ 3d-ion pairs in KZnF3 crystals are studied. It is shown that the double-exchange interaction can be significantly reduced by the low-symmetry crystal field created by a compensator. The features of the exchange interaction and optical absorption spectra are qualitatively analyzed

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3.
Инвентарный номер: нет.
   
   E 43


   
    Electronic Structure and the Optical and Photocatalytic Properties of Anatase Doped with Vanadium and Carbon / V. M. Zainullina, V. P. Zhukov, V. N. Krasil'nikov, M. Yu. Yanchenko, L. Yu. Buldakova, E. V. Polyakov // Physics of the Solid State. - 2010. - vol. 52, № 2. - P271-280 : il. - Bibliogr. : p. 279-280 (45 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АНАТАЗ -- ВАНАДИЙ -- КАРБОН -- ФОТОКАТАЛИТИЧЕСКИЕ СВОЙСТВА -- ЭЛЕКТРОННАЯ СТРУКТУРА
Аннотация: The electronic structures of undoped anatase and anatase doped with carbon and vanadium have been calculated using the ab initio tight binding linear muffin tin orbital (TB-LMTO) method in the LSDA + U approximation. It has been shown that the doping of TiO2 leads to the formation of narrow bands of the C and V impurity states in the band gap. The calculations of the imaginary part of the dielectric function have made it possible to estimate the intensity of the optical absorption. It has been established that the doping with vanadium and carbon leads to optical absorption in the visible range and to an increase in the absorption in the ultraviolet range up to 4 eV. This should result in an increase in the photocatalytic activity on the surface of the doped anatase. The experimental determination of the photocatalytic activity of whiskers of the anatase doped with carbon and vanadium in the reaction of hydroquinone oxidation has confirmed the increase in the activity of the doped materials under exposure to ultraviolet, visible, and blue light. The phenomenon of dark catalysis in the anatase doped with carbon and vanadium has been interpreted within the concept of low-energy electronic excitations between the impurity levels of carbon

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4.
Инвентарный номер: нет.
   
   E 43


   
    Electronic structure and x-ray spectra of defective oxides LixCoO2 / V. R. Galakhov [et al.] // Physical Review B. - 2006. - Vol. 74, № 4. - P.045120(1-6) : il. - Bibliogr. : p. 045120(5-6) (26 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТРУКТУРА ЭЛЕКТРОННАЯ -- СПЕКТРЫ РЕНТГЕНОВСКИЕ -- ОКСИДЫ -- LiCoO2
Аннотация: X-ray absorption, resonant x-ray emission, and x-ray photoelectron spectra of the valence band and core levels have been measured for LixCoO2 (0.6<=x<=1.0,. Resonant O K(alfa) x-ray emission spectra of LiCoO2,,showed localized excitonic states due to a dd transition between unoccupied and occupied Co 3d states. On the basis of measurements of Co 3s x-ray photoelectron and Co 2p and O 1s x-ray absorption spectra it was established that in defective cobaltites the electronic holes are localized mainly in O 2p states. Evidence of phase separation in LixCoO2 has been found

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5.
Инвентарный номер: нет.
   
   G 15


    Galakhov, V. R.
    Electronic structure of defective lithium cobaltites LixCoO2 / V. R. Galakhov, M. Neumann, D. G. Kellerman // Applied Physics A. - 2009. - Vol. 94. - P.497-500 : il. - Bibliogr. : p. 500 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОБАЛЬТИТ ЛИТИЯ -- СТРУКТУРА ЭЛЕКТРОННАЯ -- РЕНТГЕНОВСКИЕ ЭМИССИОННЫЕ СПЕКТРЫ
Аннотация: X-ray absorption, resonant X-ray emission, and??X-ray photoelectron spectroscopical methods have been applied for the study of the electronic structure of defective lithium cobaltites LixCoO2 (0.6 . x . 1.0). Resonant O K alfa X-ray emission spectra of LiCoO2 showed localized excitonic??states due to a dd transition between occupied and??unoccupied Co 3d states. On the base of measurements of Co 3s X-ray photoelectron, Co 2p, and O 1s X-ray absorption spectra, it was established that in defective cobaltites??the electronic holes are localized mainly in O 2p states. An evidence of phase separation in LixCoO2 has been found. It was shown that the semiconductor-to-metal transition in LixCoO2 (x <0.76) at about 160 K is not accompanied by??changes in the Co 3d electronic configuration which remains 3d6

\\\\Expert2\\nbo\\Applied Physics A Materials Science and Processing\\2009, v. 94, N 3, p. 497-500.pdf
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6.
Инвентарный номер: нет.
   
   E 91


   
    Europium Valence State in Europium Monoxide–Iron (Cobalt) Magnetic Composites / N. I. Ignat'eva, A. S. Shkvarin, V. I. Osotov, L. D. Finkel’shtein // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 10. - P1517-1521 : il. - Bibliogr. : p. 1520-1521 (8 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ЕВРОПИЯ -- ПОРОШКИ -- КОБАЛЬТ -- ЖЕЛЕЗО
Аннотация: Composite magnetic powders EuO/Fe(Co) were synthesized. These composites are candidates for use as materials for spintronics devices operating at room temperature. The composites synthesized by carbothermal reduction of oxide mixtures Eu2O3 and Fe2O3(or Co3O4) contain not only europium in the main valence state (2+) but also europium in the state 3+, its content increasing with the content of the d metal and depending on technological parameters of the reduction process. The content of the trivalent europium in the composites was estimated by chemical analysis and L111-edge X-ray absorption spectroscopy (XAS). The results obtained by these methods correlate with each other. XAS is considered to be a quantitative express method of certification of materials containing europium in various valence states

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7.
Инвентарный номер: нет.
   
   K 93


    Kurbatova, L. D.
    Extraction recovery of vanadium(V) from sulfuric acid solutions [Text] / L. D. Kurbatova, D. I. Kurbatov // Russian Journal of Applied Chemistry. - 2006. - Vol. 79, № 5. - P850-852 : il. - Bibliogr. : p. 852 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭКСТРАКЦИЯ ВАНАДИЯ -- СЕРНАЯ КИСЛОТА -- ВАНАДИЙ ПЯТИВАЛЕНТНЫЙ
Аннотация: The IR and electronic absorption spectra of di-2-ethylhexyl hydrogen phosphate (HDEHP) extracts of vanadium(V) and sulfuric acid and of vanadium(V) solutions in sulfuric acid were studied. The composition of the extractable complex was determined, and the equation of vanadium(V) extraction with HDEHP was suggested. The equilibrium constant of vanadium(V) extraction from concentrated sulfuric acid solutions was found

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8.
Инвентарный номер: нет.
   
   F 42


   
    Ferromagnetic Resonance and Antiresonance in Lanthanum–Yttrium Manganite Powder / A. B. Rinkevich, A. P. Nossov, V. G. Vasil'ev, E. V. Vladimirova // Technical Physics. - 2004. - Vol. 49, № 6. - P751-757 : il. - Bibliogr. : p. 757 (25 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФЕРРОМАГНИТНЫЙ РЕЗОНАНС -- ФЕРРОМАГНИТНЫЙ АНТИРЕЗОНАНС -- ЛАНТАН-ИТТРИЕВЫЕ МАНГАНИТЫ -- ПОРОШКИ
Аннотация: Absorption of centimeter waves in La0.6Y0.07Ba0.33MnO3 manganite powder is studied under the conditions of ferromagnetic resonance and antiresonance. It is found that interaction between different components of the microwave fields and the manganite distorts the shape of resonance lines and changes the resonance-to-antiresonance amplitude ratio. In the range of ferromagnetic resonance fields, great (up to 25 times) changes in the transmitted microwave power are observed

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9.
Инвентарный номер: нет.
   
   S 53


    Shein, I. R.
    First-principle study of B1-like thorium carbide, nitride and oxide [Текст] / I. R. Shein, K. I. Shein, A. L. Ivanovskii // Journal of Nuclear Materials. - 2006. - Vol. 353, № 1-2. - С. 19-26. - Bibliogr. : p. 26 (28 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАРБИД ТОРИЯ -- НИТРИД ТОРИЯ -- ОКСИД ТОРИЯ -- ПЕРВОПРИНЦИПНЫЕ РАСЧЕТЫ
Аннотация: The electronic properties of cubic (B1-type) thorium carbide (ThC), nitride (ThN) and meta-stable monoxide (ThO) were calculated systematically using the full-potential linearized augmented plane wave method with the generalized gradient approximation for the exchange and correlation potential (LAPW–GGA). The structural parameters, bulk modulii, electronic bands, densities of states (DOS), charge distributions were obtained and compared with available experimental data and other calculations. The theoretical spectra of non-metal K-edge X-ray emission (XES) and absorption (XAS) of these materials are presented and discussed

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10.
Инвентарный номер: нет.
   
   B 22


    Bannikov, V. V.
    Isotropic and Anisotropic Exchange Interactions in the Orbitally Degenerate Excited (4A2x2T2) State of a Cr3+ Ion Pair Possessing D3h Symmetry / V. V. Bannikov, B. V. Mitrofanov // Physics of the Solid State. - 2002. - Vol. 44, № 8. - P1550-1552 : il. - Bibliogr. : p. 1552 (4 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИОНЫ ХРОМА -- ХРОМ -- АНИЗОТРОПИЯ
Аннотация: Experimentally observed optical absorption spectra of isolated pairs of chromium ions in Cs3Cr2Br9 corresponding to transitions of pairs from the ground (4A2x 2A2) state to a singly excited (4A2 xT2) state are theoretically interpreted. It is shown that the position of the exchange multiplets in the excited (4A2 x2T2) state is determined mainly by the resonance exchange interactions removing the degeneracy with respect to the exchange by an excitation within the pair. It is established that the observed fine structure of the pair in the (4A2 x2T2) state is due to a superposition of the contributions from the one- and two-center spin–orbit interaction and resonance antisymmetric exchange

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