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1.

Вид документа : Статья из журнала
Шифр издания : 54/T 89
Автор(ы) : Tsidilkovski V. I.
Заглавие : Thermodynamic isotope effect H/D/T in proton-conducting oxides
Место публикации : Solid State Ionics. - 2003. - Vol. 162-163. - С. 47-53.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The thermodynamic isotope effect H/D/T for proton conducting oxides in equilibrium with gas phase was theoretically considered. The difference in concentrations n of hydrogen, deuterium and tritium in the same samples exposed to gas phases containing the vapors of only one of these elements was analyzed. The oxides of the AIIB1-xIVRxIIIO3-y type were considered in the frame of some known defect formation models. It was shown that for a characteristic change in the proton-associated vibration frequencies with isotopic substitution of protons, the concentrations nH, nD and nT, under equivalent external conditions, might be appreciably different. The effect essentially depends on the external conditions and on the ratio of nH to dopant concentration x: it is maximal at low nH and disappears when nH/x1. A possibility of direct experimental observation of the thermodynamic isotope effect in perovskite oxides is briefly discussed.????
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Solid State Ionics\\2003, V. 162-163, С. 47-53.pdf
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2.

Вид документа : Статья из журнала
Шифр издания : 54/S 70
Автор(ы) : Баталов Н. Н., Желтоножко О. В., Зарембо С. Н., Ахметзянов Т. М., Волкова О. В., Зелютин Г. В., Обросов В. П., Тамм В. Х.
Заглавие : Твердоэлектролитные сепараторы на основе двойных нитридов для высокотемпературных литиевых аккумуляторов
Параллельн. заглавия :Solid-electrolyte separators based on binary nitrides for high-temperature lithium storage batteries
Место публикации : Электрохимия. - 1995. - Т. 31, N 4. - С. 394-402. - ISSN 0424-8570. - ISSN 0424-8570
Примечания : Библиогр.: с. 402 (43 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Thermodynamic evaluations of corrosion resistance of solid electrolytes with respect to lithium at high temperatures are performed. Solid electrolytes on the basis of binary lithium nitrides and elements of groups II to VI are shown to be among the most corrosion resistant, in contact with lithium, lithium cation conductors. Data on conductance of such electrolytes as well as polarization curves for lithium-solid electrolyte and solid electrolyte-molten electrolyte interfaces are prosented. Polarization resistances of these interfaces in nitride electrolytes are found to be much lower than those in oxide electrolytes. Test results on a breadboard lithium storage battery with a solid electrolyte separator made of Li3AlN2 are reported
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3.

Вид документа : Статья из журнала
Шифр издания : 54/F 96
Автор(ы) : Douvartzides S. L., Coutelieris F. A., Demin A. K., Tsiakaras P.
Заглавие : Fuel options for solid oxide fuell cells: a thermodynamic analysis
Место публикации : AIChE Journal. - 2003. - Vol. 49, № 1. - С. 248-257.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The eligibility of natural gas (methane), methanol, ethanol, and gasoline as fuels for the generation of electrical power in solid oxide fuel cells (SOFCs) is discussed in terms of efficiency. Each raw fuel was assumed to be processed in a steam reformer to provide a hydrogen-rich gas mixture to the SOFC feedstream. An SOFC system, consisting of an electrochemical section and a reformer, was analyzed thermodynamically assuming initial steam/fuel feed ratios at conditions where carbon deposition is thermodynamically impossible, at atmospheric total pressure, and in the temperature range of 800-1,200 K. Results were obtained in terms of both electromotive force (emf) output and efficiency. Methane seems to be the most appropriate fuel option, with an SOFC system efficiency close to 96%. Furthermore, ethanol and methanol were very promising alternative options (94% and 91%, respectively), while gasoline (83%) utilization requires special reforming conditions.
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\AIChE Journal\\2003, V. 49, № 1, С. 248-257.pdf
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4.

Вид документа : Статья из журнала
Шифр издания : 54/S 54
Автор(ы) : Shkerin S., Primdahl S., Mogensen M.
Заглавие : Polarisation resistance of the O2, Au/O2- and H2-H2O, Au/O2- electrode system
Место публикации : Ionics. - 2003. - Vol. 9, № 1-2. - С. 140-150.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Gold electrodes with known contact geometries were studied using impedance spectroscopy. From these data it was possible to determine the specific polarisation conductivity per unit length of three-phase boundary (TPB). The values were found to be (3-22)x10-4 S·cm-1 dependent on the electrode history in pure oxygen at 977 °C and 2x10-6 S·cm-1 at 977 °C in “pure” hydrogen (PO2=10-20 atm at 1001 °C). The results are compared with previous data obtained for platinum electrodes.
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Ionics\\2003, V. 9, № 1-2, С. 140-150.pdf
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5.

Вид документа : Статья из журнала
Шифр издания : 54/R 32
Автор(ы) : Redkin А., Tkacheva O.
Заглавие : Electrical Conductivity of Molten Fluoride-Oxide Melts
Место публикации : Journal of Chemical & Engineering Data. - 2010. - Vol. 55, № 5. - С. 1930-1939.: рис. - ISSN 0021-9568. - ISSN 0021-9568
Примечания : Bibliogr. : p. 1938-1939 (32 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Empirical equations describing the electrical conductivities of fluorides and fluoride-oxide mixtures have been obtained. These equations are based on two suppositions: (a) electrical conductivity of ionic molten substances is connected with the electronic structure of the cations; (b) the electrical conductivity of ionic melts can be expressed in terms of molar volume. In molten mixtures, the form of the electrical conductivity isotherm depends on the interaction between the components
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Journal of chemical & engineering data\\2010, № 5, p. 1938-1939.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 54/I-70
Автор(ы) : Medvedev D., Maragou V., Zhuravleva T., Demin A., Gorbova E., Tsiakaras P.
Заглавие : Investigation of the structural and electrical properties of Co-doped BaCe0.9Gd0.1O3 - дельта
Место публикации : Solid State Ionics. - 2011. - Vol. 182, № 1. - С. 41-46. - ISSN 0167-2738. - ISSN 0167-2738
Примечания : Bibliogr. : p. 45-46 (43 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: In the present work the effect of cobalt oxide addition on the density and on the electrical properties of gadolinium-doped barium cerate is investigated. A series of BaCe0.9 б xGd0.1CoxO3 б б (x = 0.00, 0.01, 0.03, 0.05, 0.07, 0.10) samples were prepared according to the conventional solid state reaction synthesis technique. The experimental results indicated that the addition of cobalt oxide leads to the improvement of the sintering properties and the enhancement of the grain dimensions. It was found that the investigated complex oxides crystallize at cubic singony. Moreover, according to the X-ray diffraction (XRD) and the scanning electron microscopy (SEM) analyses, the prepared samples are single-phase in the range of 0.00 x б 0.10, while at compositions of x б 0.03 there is almost no open porosity. According to the four-probe dc electrical conductivity measurements, the conductivity of the BaCe0.9 б xGd0.1CoxO3 б б samples is inferior to the undoped ones (BaCe0.9Gd0.1O3 б б—BCG) in wet air atmosphere. However, the presence of Co in the range of 0.03 б x б 0.10 at higher temperatures (800–900 °C) has smaller impact on the electrical conductivity values. Finally, in wet hydrogen atmosphere the electrical conductivity values of the 1 mol% Co-doped sample were found to be close enough to the ones of the undoped sample, leading to the conclusion that cobalt can be effectively employed as a sintering additive of gadolinium-doped barium cerates.
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Solid State Ionics\\SSI2011 V.182, N 1. - P.41-46.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Osipenko A., Maershin A., Smolenski V., Novoselova A., Kormilitsyn M., Bychkov A.
Заглавие : Electrochemistry of oxygen-free curium compounds in fused NaCl–2CsCl eutectic
Место публикации : Journal of Nuclear Materials . - 2010. - Vol. 396, № 1. - С. 102-106. - ISSN 0022-3115. - ISSN 0022-3115
Примечания : Библиогр.: с. 106 (37 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: This work presents the electrochemical study of Cm(III) in fused NaCl–2CsCl eutectic in the temperature range 823–1023 K. Transient electrochemical techniques such as cyclic, differential pulse and square wave voltammetry, and chronopotentiometry have been used in order to investigate the reduction mechanism of curium ions up to the metal. The results obtained show that the reduction reaction takes place in a single step . The diffusion coefficient of [CmCl6]3- complex ions was determined by cyclic voltammetry at different temperatures by applying the Berzins–Delahay equation. The validity of the Arrhenius law was also verified and the activation energy for diffusion was found to be 44.46 kJ/mol. The apparent standard electrode potential of the redox couple Cm(III)/Cm(0) was found by chronopotentiometry at several temperatures. The thermodynamic properties of curium trichloride have also been calculated.????
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Journal of Nuclear Materials\\JNM2010, V 396, N 1. - P. 102-106.pdf
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8.

Вид документа : Статья из журнала
Шифр издания : 54/S 19
Автор(ы) : Samgin A. L.
Заглавие : Optical theorem for the Kramers’ problem
Место публикации : Journal of Physics and Chemistry of Solids. - 2010. - Vol. 71, № 3. - С. 242-247.
Примечания : Bibliogr. : p. 247 (42 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Optical theorem formulation of the Kramers’ problem is proposed. A new technique to estimate the rate of escape in the Kramers model is developed, making use of analyticity relations analogous to those of the scattering amplitude appearing in particle physics. The formalism is shown to provide a very short derivation of the Mel'nikov–Meshkov solution for energy distribution functions in the barrier region, because of analyticity requirements alone. When the escape event is viewed as a causal one, appropriate analytic functions yielding the rate constant obey some relations in the Fourier space very analogous to those of the Kramers and Kronig for the dielectric function. While it seems to be rather a simplistic description, it reveals a linkage between the refractive index and the superionic conduction. We briefly discuss other relevant aspects as the ac conductivity of ionic solids and relationships between the activation energy of superionic conductors and dielectric constant quite similar with those reported by Wakamura (JPCS, 59 (1998) 591).
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Journal of Physics and Chemistry of Solids\\JPCS2010 V. 71, N 3. - P.242-247.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Pikalova E. Yu., Marago V. I., Demin A. K., Murashkina A. A., Tsiakaras P. E.
Заглавие : Synthesis and electrophysical properties of (1 - x)Ce0.8Gd0.2O2 дельта + xTiO2 (x = 0–0.06) solid-state solutions
Место публикации : Solid State Ionics. - 2008. - Vol. 179, № 27-32. - С. 1557-1561.: рис.
Примечания : Библиогр.: с. 1561 (12 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: In the present work the electrical properties of (1 ? x)Ce0.8Gd0.2O2 ? ? + xTiO2 (x = 0–0.06) synthesized by the standard ceramic technology were investigated, in a wide range of oxygen partial pressures (0.21–10? 20atm at 900 °C) and temperatures (600–900 °C), both in air and H2 + 3%H2O atmosphere. It was found, that only the introduction of above 1 mol% TiO2 decreases the sintering temperature of Ce0.8Gd0.2O2 ? ?. The values of total electrical conductivity do not change significantly with the content of the sintering aid up to 3 mol%, while the activation energy of total conductivity in air decreases considerably with the introduction of TiO2 into Ce0.8Gd0.2O2 ? ? from 87 to 67 kJ/mol; however, it is independent of x up to 0.03. The dependence of the total conductivity on the oxygen partial pressure is characterized by three regions. In the intermediate region (10? 10–10? 14) the conductivity behavior is described according to the oxygen vacancy model. The n-type conductivity region curve of Ce0.8Gd0.2O2 ? ? is fitted to a -1/5 slope. The increase of TiO2 content leads to the slope increase at ? 1/6, ? 1/8 and ? 1/9 for 1, 2 and 3 mol% TiO2, respectively, due to the trapping of electrons by Ti4+. 1 mol% doping increases the electrolytic region of Ce0.8Gd0.2O2 ? ? from 10? 10 to 10? 13atm. Finally, the optimal content of TiO2 from the viewpoint of sintering and electrical properties was found to be 2 mol%.????
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Solid State Ionics\\2008, V. 179, № 27-32, С. 1557-1561.pdf
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samgin A. L.
Заглавие : A model for anomalous penetration of "hot" deuterium in proton conductors
Место публикации : Solid State Ionics. - 2002. - V. 152-153. - С. 759-762. - ISSN 0167-2738. - ISSN 0167-2738
Примечания : Bibliogr.: 21 ref.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): химия--диффузия аномальная--аномальная диффузия--оксиды перовскитные--перовскитные оксиды--дейтерий--d--srceo3--sr--церат стронция--стронций--srzro3--цирконат стронция--baceo3--ba--барий--церат бария--протонные проводники--проводники протонные
Аннотация: It is suggested that a charge carrier transport in superionic conductors may follow an anomalous (e.g., superdiffusive) mechanism owing to effects of the fractality and the clustering. An anomalous penetration of "hot" deuterium ions (D of about 100 keV) in doped SrCeO3-type oxides can be modeled by using a diffusion-like equation with fractional derivatives in place of commonly used Fick's law. A tail exponent gamma for concentration distribution in proton conductors is introduced. A comparison with experimental data is made
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