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1.
Инвентарный номер: нет.
   
   O-66


   
    Optical Absorption and Nuclear Magnetic Resonance in Lithium Titanium Spinel Doped by Chromium / D. G. Kellerman, N. A. Mukhina, N. A. Zhuravlev, M. S. Valova, V. S. Gorshkov // Physics of the Solid State. - 2010. - Vol. 52, № 3. - P459-464 : il. - Bibliogr. : p. 463-464 (34 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОПТИЧЕСКАЯ АБСОРБЦИЯ -- ЯМР -- ЯДЕРНЫЙ МАГНИТНЫЙ РЕЗОНАНС -- ТИТАНАТ ЛИТИЯ -- ШПИНЕЛИ -- ДОПИРОВАНИЕ -- ХРОМ
Аннотация: The optical absorption and nuclear magnetic resonance spectra of Li4 – xCr3xTi5 – 2xO12 (x = 0, 0.01, 0.02, 0.04) solid solutions have been investigated. It has been found that, in the Li4Ti5O12 spinel, lithium ions migrate from tetrahedral to octahedral positions with increasing temperature. Doping of chromium to the spinel favors an increase in the fraction of tetrahedrally coordinated lithium and hinders diffusion

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2.
Инвентарный номер: нет.
   
   O-97


   
    Oxygen Nonstoichiometry and Ionic Conductivity of Sr3Fe2-xScxO7-delta / A. A. Markov, M. V. Patrakeev, V. V. Kharton, Y. V. Pivak, I. A. Leonidov, V. L. Kozhevnikov // Chemistry of Materials. - 2007. - v.19, № 16. - С. 3980-3987. - Bibliogr. : 30 ref.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ КИСЛОРОДНАЯ -- ПРОВОДИМОСТЬ ИОННАЯ -- СКАНДИЙ -- ЖЕЛЕЗО -- СТРОНЦИЙ
Аннотация: The substitution of scandium for iron in the Ruddlesden-Popper Sr3Fe2-xScxO7-delta (x=0-0.3) system increases tetragonal unit-cell volume and oxygen nonstoichiometry and decreases partial p- and n-type electronic conductivities studied in the oxygen partial pressure range from 1 x 10(-20) to 0.7 atm at 973-1223 K. The solubility of Sc(3+) corresponds to approximately x ~ 0.35. The relatively low, temperatureactivated hole mobility indicates a small-polaron mechanism of the electronic transport, as for undoped Sr3Fe2O7-delta. The atomistic computer simulations showed that major contribution to the ionic conductivity is provided by the oxygen sites surrounded by iron cations in the perovskite-type layers of Sr3(Fe,Sc)2O7-delta structure, whereas stable ScO6 octahedra are essentially excluded from the oxygen diffusion processes.??Minimum migration energy, 0.9-1.4 eV, was found for nonlinear pathways formed by the apical O1??sites linking iron-oxygen polyhedra along the c-axis and equatorial O3 positions in the perovskite-type??planes. The direct O3 f O3 jumps are characterized with higher energetic barrier, 1.5-2.2 eV. Because??of the increasing concentration of vacant O3 sites induced by scandium doping, the apparent activation energy for oxygen-ionic transport decreases from about 2 eV, as observed for undoped strontium ferrite at 1123-1223 K, down to 0.95-1.15 eV for Sr3Fe2-xScxO7-delta (x = 0.2-0.3). As a result, the partial ionic conductivity of Sr3Fe1.7Sc0.3O7-delta at temperatures below 1000 K becomes higher than that in Sr3Fe2O7-delta

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3.
Инвентарный номер: нет.
   
   S 46


   
    Semiconductor-metal transition in defect lithium cobaltite [Текст] / D. G. Kellerman, V. R. Galakhov, A. S. Semenova, Ya. N. Blinovskov, O. N. Leonidova // Physics of the Solid State. - 2006. - Vol. 48, № 3. - С. 548-556. - Библиогр. : с. 555 (36 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРЕХОД ПОЛУПРОВОДНИК - МЕТАЛЛ -- КОБАЛЬТИТ ЛИТИЯ
Аннотация: The magnetic susceptibility, electrical conductivity, and x-ray photoelectron and x-ray absorption spectra of defect lithium cobaltites of the general formula Li1−xCoO2 are investigated. It is found that, for lithium cobaltites with x> 0.25, the magnetic susceptibility increases abruptly and the conductivity type changes at T~ 150 K. The assumption is made that the semiconductor–metal transition in defect lithium cobaltite is caused by the increase in the diffusion mobility of lithium ions with an increase in the temperature when there is a correlation between spatial distributions of lithium vacancies and “electron” holes

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4.
Инвентарный номер: нет.
   
   P 93


   
    Properties of barium hexaferrite prepared by electric field assisted self-propagating high-temperature synthesis [Text] / S. M. Busurin, Yu. G. Morozov, M. V. Kuznetsov, M. L. Chernega, A. A. Chobko // Inorganic Materials. - 2006. - Vol. 42, № 12. - P1374-1378 : il. - Библиогр. : с. 1377 (16 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ГЕКСАФЕРРИТ БАРИЯ -- СИНТЕЗ ВЫСОКОТЕМПЕРАТУРНЫЙ -- СВОЙСТВА МАГНИТНЫЕ -- ПОРОШКИ
Аннотация: We have prepared ferromagnetic barium hexaferrite powders by self-propagating high-temperature synthesis (SHS) in an electric field applied by a contactless method. Our results indicate that the field strength has a significant effect on the phase composition of the synthesis product. This effect is interpreted in terms of the decomposition kinetics of the solid oxidant and reactant diffusion. Microstructural examination demonstrates that an electric field has a marked effect on the orphology of SHS materials. The magnetic properties of the synthesized powders depend significantly on both the strength and direction of the applied field

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5.
Инвентарный номер: нет.
   
   Z 19


    Zakharova, G. S.
    Synthesis and Properties of the Mixed Hydrated Oxides V2-yWyO5+delta·nH2O [Текст] / G. S. Zakharova, V. L. Volkov // Journal of Sol-Gel Science and Technology. - 2005. - Vol. 34, № 3. - С. 293-298. - Библиогр. : с. 298 (18 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВОЛЬФРАМА -- ОКСИД ВАНАДИЯ -- ЗОЛЬ-ГЕЛЬ МЕТОД -- ТОНКИЕ ПЛЕНКИ -- ФОТОЭЛЕКТРОННЫЕ СПЕКТРЫ -- ПРОВОДИМОСТЬ
Аннотация: Compounds of the general formula V2−yWyO5+δ ·nH2O (0 < y ≤ 0.25) with the layered structure of polyvanadic acid V2O5·nH2O (H2V12O31−δ ·nH2O) have been prepared from peroxide solutions using the sol–gel process. The samples contain up to 5–8 wt% vanadium (IV). The water content changes within the range of 0.7 ≤ n ≤ 1.5 in depending on tungsten concentration. The V2−yWyO5+δ ·nH2O (y ≤ 0.125) form the thin films described an interlayer distance of 11.60 ± 0.05 A° . The thermal properties, IR, and X-ray photoelectron spectra of the compounds synthesized have been studied. The thermal stability of the phases increases with the rising of tungsten content. The dehydration finishes with the forming solid solution V2−yWyO5 and WO3. The electrical conductivity of V2−yWyO5+δ ·nH2O (0 < y ≤ 0.25) powders was measured between 293 and 473 K at a relative humidity of 12%. The activation energy of conduction is independent upon theWcontent and equals 0.22–0.24 eV. Partial substitution of vanadium for tungsten was found to reduce the conductivity of the phases. The conductivity of the films increases with the increasing of relative air humidity and is governed by proton diffusion across the V O W layers

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6.
Инвентарный номер: нет.
   
   P 56


   
    Phase Relations in the NaVO3-Ca(VO3)2 System / E. M. Gorbunova, B. V. Slobodin, T. I. Krasnenko, T. P. Sirina // Inorganic Materials. - 2004. - Vol. 40, № 4. - P. 407-410 : il. - Bibliogr. : p. 410 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗОВЫЕ ДИАГРАММЫ -- ВАНАДАТ КАЛЬЦИЯ -- ВАНАДАТ НАТРИЯ
Аннотация: The phase diagram of the NaVO3–Ca(VO3)2 system is mapped out. The system is shown to contain NaVO3-based solid solutions (0–5 mol % Ca(VO3)2), Ca(VO3)2-based solid solutions (0–17 mol % NaVO3), and the double metavanadate Na2Ca(VO3)4. The results on the sequence of phase changes during heat treatment of an Na2CO3+ CaCO3+ 2V2O5mixture and on the direction of diffusion flows (studied by the Tubandt method) indicate that the phase formation in the NaVO3–Ca(VO3)2 system is mainly due to the diffusion of Na+ ions

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7.
Инвентарный номер: нет.
   


   
    63,65Cu NMR study of low-frequency spin dynamics in the infinite-layer antiferromagnetic compound SrCuO2 [Текст] / K. N. Mikhalev, S. O. Rebrin, A. P. Gerashenko, T. V. D'yachkova // JETP Letters (Translation of Pis'ma v Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki). - 2004. - Vol. 80, № 8. - С. 540-543. - Библиогр. : с. 543 (15 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АНТИФЕРРОМАГНЕТИКИ -- ЯМР -- МЕДЬ
Аннотация: The spin–lattice and spin–spin relaxation times have been measured for 63,65Cu NMR in the infinite-layer antiferromagnet SrCuO2 in the ordered state for temperatures from 4.2 to 361 K. In the region of low temperatures (T£ 250 K), both relaxation processes are of the same nature and the main contribution to the relaxation rate is associated with the diffusion of a small number of holes with an activation energy of ~42 meV. In the hightemperature range (T > 250 K), contributions to the transverse relaxation rate exhibit redistribution and this relaxation process is determined predominantly by indirect interactions

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8.
Инвентарный номер: нет.
   
   O-97


   
    Oxygen Ionic and Electronic Transport in Apatite-Type Solid Electrolytes [] = Oxygen Ionic and Electronic Transport in Apatite-Type Solid Electrolytes / V. V. Kharton, A. L. Shaula, M. V. Patrakeev, J. C. Waerenborgh, D. P. Rojas, N. P. Vyshatko, E. V. Tsipis, A. A. Yaremchenko, F. M. B. Marques // Journal of the Electrochemical Society. - 2004. - V. 151, N 8. - С. A1236-A1246. - Библиогр.: с. A1246 (35 назв.) . - ISSN 0013-4651
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КИСЛОРОД -- ИОНЫ -- ИОННЫЙ ПЕРЕНОС -- ЭЛЕКТРОЛИТЫ -- СТРУКТУРА ТИПА АПАТИТА -- ТВЕРДЫЕ ЭЛЕКТРОЛИТЫ -- ЭЛЕКТРОЛИТЫ ТВЕРДЫЕ -- ИОННАЯ ПРОВОДИМОСТЬ -- ПРОВОДИМОСТЬ ИОННАЯ -- ДОБАВКИ -- ИСТОЧНИКИ ТОКА -- ИОНЫ КИСЛОРОДА -- ЖЕЛЕЗО -- Fe
Аннотация: The oxygen ionic conductivity of apatite-type La9.83Si4.5Al1.5-yFeyO26 + - delta (y = 0-1.5), La10-xSi6-yFeyO26 + - delta (x = 0-0.77; y = 1-2), and La7-xSr3Si6O26 + - delta (x = 0-1) increases with increasing oxygen content. The ion transference numbers, determined by faradaic efficiency measurements at 973-1223 K in air, are close to unity for La9.83Si4.5Al1.5-yFeyO26 + - delta and La10Si5FeO26.5, and vary in the range 0.96-0.99 for other compositions. Doping of La9.83(Si, Al)6O26 with iron results in an increasing Fe4+ fraction, which was evaluated by Mossbauer spectroscopy and correlates with partial ionic and p-type electronic conductivities, whereas La-stoichiometric La10(Si, Fe)O26 + delta apatites stabilize the Fe3+ state. Among the studied materials, the highest ionic and electronic transport is observed for La10Si5FeO26.5, where oxygen interstitials are close neighbors of Si-site cations. Data on transference numbers, total conductivity, and Seebeck coefficient
as a function of the oxygen partial pressure confirm that the ionic conduction in Fe-substituted apatites remains dominant under solid oxide fuel cell operation conditions. However, reducing p (O2) leads to a drastic decrease in the ionic transport, presumably due to a transition from the prevailing interstitial to a vacancy diffusion mechanism, which is similar to the effect of acceptor doping. Iron additions improve the sinterability of silicate ceramics, increase the n-type electronic conductivity at low p(O2), and probably partly suppress the ionic conductivity drop. The thermal expansion coefficients of apatite solid electrolytes in air are (8.8-9.9)x10(-6) K(-1) at 300-1250 K

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9.
Инвентарный номер: нет.
   
   L 96


   
    Luminescence of a transparent alumina ceramic doped with chromium and titanium / V. S. Kiiko, Yu. N. Makurin, A. A. Safronov, A. N. Enyashin, A. L. Ivanovskii // Refractories and Industrial Ceramics. - 2003. - Vol. 44, № 2. - P94-98 : il. - Bibliogr. : p. 98 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЛЮМИНЕСЦЕНЦИЯ -- ХРОМ -- ТИТАН -- КЕРАМИКА
Аннотация: Specimens of transparent alumina ceramic (TAC) are prepared by slip casting. An alumina spinel, formed during sintering under vacuum or under reducing conditions, as well as individual phases, produced by thermochemical doping with chromium and titanium, are identified. The spectra of steady-state x-ray luminescence (SXL) and pulsed cathodoluminescence (PCL) and the PCL decay kinetics are studied. The highest STL and PCL intensity were observed in specimens that were prepared by thermal diffusion using a carbon +TiO2 pack. Ti-doped TAC, characterized by a rapid decay of luminescence in the UV region, can be recommended as a promising material for the detector of a scintillation dosimeter. The luminescent chromium ions (isomorphic substituents of aluminum ions in the crystal lattice) are unsuitable for that purpose because of their long luminescence de-excitation time

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10.
Инвентарный номер: нет.
   
   S 89


   
    Structure, Ionic Conduction, and Phase Transformations in Lithium Titanate Li4Ti5O12 / I. A. Leonidov, O. N. Leonidova, L. A. Perelyaeva, R. F. Samigullina, S. A. Kovyazina, M. V. Patrakeev // Physics of the Solid State. - 2003. - Vol. 45, № 11. - P2183-2188 : il. - Bibliogr. : p. 2188 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИОННАЯ ПРОВОДИМОСТЬ -- ФАЗОВЫЙ ПЕРЕХОД -- ТИТАНАТ ЛИТИЯ
Аннотация: The spinel structure of lithium titanate Li4Ti5O12 is refined by the Rietveld full-profile analysis with the use of x-ray and neutron powder diffraction data. The distribution and coordinates of atoms are determined. The Li4Ti5O12 compound is studied at high temperatures by differential scanning calorimetry and Raman spectroscopy. The electrical conductivity is measured in the high-temperature range. It is shown that the Li4Ti5O12 compound with a spinel structure undergoes two successive order–disorder phase transitions due to different distributions of lithium atoms and cation vacancies (vacancy, V) in a defect structure of the NaCl type: (Li)8a[Li0.33Ti1.67]16dO4-> [Li vacancy]16c[Li0.33Ti1.67]16dO4 [Li1.33 vacancy0.67]16c[Ti1.67 vacancy0.33]16dO4. The low-temperature diffusion of lithium predominantly occurs either through the mechanism … ->Li(8a)-> V(16c)->V(8a) … in the spinel phase or through the mechanism … Li(16c) ->V(8a)-> V(16c)-> … in an intermediate phase. In the high-temperature phase, the lithium cations also migrate over 48f vacancies: …->Li(16c)-> V(8a, 48f) ->V(16c) ->….

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