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Труды Института высокотемпературной электрохимии УрО РАН
Труды Института истории и археологии УрО РАН
Труды сотрудников Института горного дела УрО РАН
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Труды сотрудников ЦНБ УрО РАН
Публикации Черешнева В.А.
Публикации Чарушина В.Н.
Каталог библиотеки ИГД УрО РАН
Каталог библиотеки ИЭРиЖ УрО РАН
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1.

Вид документа :
Шифр издания : 54/S 19
Автор(ы) : Samgin A. L.
Заглавие : Lattice-assisted proton hopping in oxides at low temperatures
Место публикации : Journal of Physics and Chemistry of Solids. - 2013. - Vol. 74, № 12. - С. 1661-1668.
Примечания : Библиогр.: с. 1668 (44 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электроосаждение--рафинирование--сплавы
Аннотация: Stimulated diffusion of protons in oxides such as ABO3 crystals and rutile TiO2 is discussed in the context of quantum Brownian motion. A self-consistent lattice-assisted proton hopping (LAPH) model is developed by going from white noise (characteristic of the standard stochastic theory of superionic conduction) to colored noise in the Markovian limit. This model differs from the commonly used ion jump models in that the hydrogen diffusion rate prefactor is identified as a quantity proportional to the frequency of phonon assistance. Application of the quantum fluctuation–dissipation theorem suggests that the dynamic activation energy for diffusion is a function of a bath-mode frequency. The LAPH model can predict enhanced rates of barrier jumping at room temperature compared to thermally activated proton diffusion. This indicates that low-temperature solid oxide devices are potential candidates for use in hydrogen energy research. The LAPH model offers a valid explanation for the mechanism of high protonic mobility recently observed for TiO2 in a picosecond transient pump-probe experiment. This unexpected dominant lattice relaxation channel must be considered as a new classical-like (but low-temperature) proton transfer mechanism. For vibration-assisted protonic jumps to occur at low temperature, the phonon assistance must be classified as a low-frequency vibration specific to each lattice
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2.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Murashkina A., Maragou V., Medvedev D., Sergeeva V., Demin A. K., Tsiakaras P.
Заглавие : Electrochemical properties of ceramic membranes based on SrTi0.5Fe0.5O3−δ in reduced atmosphere
Место публикации : International Journal of Hydrogen Energy. - 2012. - Vol. 37, № 19. - С. 14569-14575. - ISSN 03060-3199. - ISSN 03060-3199
Примечания : Bibliogr. : p. 14675 (23 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): температура --свойства--сопротивление электронное
Аннотация: The present work aims at the investigation of the electrochemical properties of SrTi0.5Fe0.5O3−δ as a membrane material for hydrogen production via electrochemical reforming. The dependence of the electrical conductivity on the oxygen partial pressure, as well as the oxygen permeability in the range of 10−20 atm ≤ ≤ 10−14 atm is examined. The oxygen permeability is measured by an electrochemical method. The dependences of ion current as a function of the electromotive force (EMF) at various temperatures, oxygen partial pressures and the membrane surface conditions (rough and activated by PrOx) are studied. Finally, the values of hydrogen flux at different temperatures are calculated and a long term investigation during 600 h at = 10−19 atm, T = 1173 K is carried out. According to the present results, the permeation current increases with the increase of temperature, oxygen partial pressure gradient and activation by PrOx. The long term investigation shows that the electrical resistance of the SrTi0.5Fe0.5O3−δ ceramic membrane increases by 10%, possibly due to the formation of micro-domains into the material's volume and the decrease in the grain boundary conductivity, because of the segregation of dopant-rich layers near the grain boundaries.
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3.

Вид документа : Статья из журнала
Шифр издания : 54/T 44
Автор(ы) : Pikalova E. Yu., Demina A. N., Demin A. K., Maragou V. I., Tsiakaras P. E.
Заглавие : The effect of co-dopant addition on the properties of LN0.2CE0.8O2-δ (LN = GD, SM, LA) solid-state electrolyte
Место публикации : Journal of Power Sources. - 2008. - Vol. 181, № 2. - С. 199-206.
УДК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электропроводность--щелочноземельные металлы--легирование
Аннотация: The present work aims at the investigation of Ln0.2Ce0.8O2−δ (where Ln = Sm, La, Gd) structural and electrical properties when in the Ln sub-lattice, Ba2+ and Sr2+ with ionic radii 1.42 and 1.26 Å, respectively, are introduced. The conductivity measurements were held both in air and in H2 + 3%H2O atmosphere using the 4-probe dc technique at the temperature range of 600–900 °C. Among all the samples, the highest value of electrical conductivity is obtained in the case of (Sm0.75Sr0.2Ba0.05)0.2Ce0.8O2−δ, both in air and in hydrogen atmosphere. In the case of H2 + 3%H2O the conductivity of the co-doped compounds increases in comparison with air. Moreover, the dependence of conductivity on the oxygen partial pressure, measured at the range of 0.21–10−22 atm, showed that the electrolytic area of alkaline-earth metals doped Ln0.2Ce0.8O2−δ is considerably enhanced, as predicted by the theory. Finally, by comparing the thermal expansion coefficients of the different materials (TEC), the thermo-mechanical compatibility between the co-doped and the other cell components was also investigated.
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4.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Fadeyev G., Kalakin A., Demin A., Volkov A., Brouzgou A., Tsiakaras P.
Заглавие : Electrodes for solid electrolyte sensors for the measurement of CO and H2 content in air
Место публикации : International Journal of Hydrogen Energy. - 2013. - Vol. 38, № 30. - С. 13484-13490.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электрод--твердые электролиты
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5.

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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6.

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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7.

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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8.

Вид документа : Статья из журнала
Шифр издания : 54/T 89
Автор(ы) : Tsidilkovski V. I., Gorelov V. P., Balakireva V. B.
Заглавие : Thermoelectric power of proton conducting oxides
Место публикации : Solid State Ionics. - 2003. - Vol. 162-163. - С. 55-61.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A theory of thermopower for proton conducting oxides (PCO) with protons, oxide ions and different electron charge carriers has been developed. The thermopower альфа of SrCe0.95Y0.05O3 дельта, BaCe0.9Nd0.1O3 дельта and of a zirconium–yttrium electrolyte as a reference material was measured in both oxidizing and reducing atmospheres. The analysis of the data obtained for the region of pure protonic conduction of SrCe0.95Y0.05O3 дельта using our theoretical results and including vibrational and configurational contributions to альфа allowed determining both the partial entropy of protons and their heat of transport. The concentrations of protons and their temperature dependences determined from the entropy term agreed well with the experimental data available from hydrogen uptake studies.
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Solid State Ionics\\2003, V. 162-163, С. 55-61.pdf
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9.

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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10.

Вид документа : Статья из журнала
Шифр издания : 54/D 48
Автор(ы) : Vykhodets V. B., Kurennykh T. E. , Nefedova O. A., Gorelov V. P., Stroeva A. Yu., Balakireva V. B., Vykhodets E. V., Obukhov S. I.
Заглавие : Deuterium diffusion in proton conductors La0.9Sr0.1ScO3 -δ and BaZr0.9Y0.1O3 -δ at room temperature
Место публикации : Solid State Ionics. - 2014. - С. P. 152-156.
Примечания : Bibliogr. : p. 156 (15 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): коэффициент активности кислорода--протонные проводники--пар
Аннотация: Room-temperature measurements of diffusion coefficients for deuterium in proton conductors La0.9Sr0.1ScO3 -δ and BaZr0.9Y0.1O3 -δ which contain dissolved H2O vapor have been performed. The concentration of oxygen structure vacancies in oxides after treatment in vapor was close to zero. A diffusion source of deuterium was created by ion implantation; measurement of the concentration–distance distribution of deuterium in samples was performed in situ during implantation. The NRA technique and 2H(d,p)3H reaction at an energy of the incident beam of 650 keV were used. For the initial and boundary conditions of the diffusion problem which were realized in the work, a solution of the inhomogeneous Fick equation was obtained. Using the technique developed, measurements of the diffusion coefficients for hydrogen in proton conductors were for the first time performed directly. For the BaZr0.9Y0.1O3 -δ oxide, the directly gained values of diffusion coefficients agree rather well with those obtained from the proton conductivity with the use of Nernst–Einstein equation
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