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1.

Вид документа : Статья из журнала
Шифр издания : 54/C 73
Автор(ы) : Gorelov V. P., Balakireva V. B., Yaroslavtsev I. Yu., Kazantsev V. A., Vaganov E. G.
Заглавие : Conductivity and thermal expansion of the Ce0.8Gd0.2O1.9 solid electrolyte in the oxidizing and reducing atmospheres
Место публикации : Russian Journal of Electrochemistry. - 2007. - Vol. 43, № 8. - С. 888-893
Примечания : Библиогр. : с. 893 (18 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Russian Journal of Electrochemistry\\2007, V. 43, № 8, С. 888-893.pdf
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2.

Вид документа :
Шифр издания : 54/C 74
Автор(ы) : Medvedev D. A. , Gorbova E. V., Demin A. K., Tsiakaras P.
Заглавие : Conductivity of Gd-doped BaCeO3 protonic conductor in Н2–Н2О–О2 atmospheres
Место публикации : International Journal of Hydrogen Energy. - 2014. - Vol. 39, № 36. - С. 21547-21552
Примечания : Bibliogr. : p. 21551-21552 (31 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): проводимость ионная--проводимость протонная--материалы керамические--твердые электролиты
Аннотация: In the present investigation, a radically new and simple method of evaluation of the proton conductivity is proposed. This method is based on the conductivity measurement of ceramic materials depending on the oxygen partial pressure (pO2) at a gradual transition from the atmosphere of pure oxygen to one of wet hydrogen: O2 → O2 (H2O) → H2O (O2) → H2O → H2O (H2) → H2 (H2O). Experimental data of total conductivities for the solid electrolyte BaCe0.9Gd0.1O3–δ (BCG) have been fitted with modeling ones in accordance with the defect chemistry model at 600, 750 and 900 °C. Experimental and theoretical relationships correlate well with each other, demonstrating the success of the proposed model description. Analysis of dependences of the total conductivity as a function of pO2 with simultaneous change of pO2 and water partial pressure (pH2O) allows the estimation of the contribution of the partial conductivities (protonic, oxygen ionic, electronic) in the total one and the identification of the areas of purely ionic and purely protonic conductivity. Using the obtained data, some transport phenomena of proton-conducting materials, which were not previously interpreted, are discussed.
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3.

Вид документа : Статья из журнала
Шифр издания : 54/C 94
Автор(ы) : Ananyev M., Medvedev D., Gavrilyuk A., Mitri S., Demin A., Malkov V., Tsiakaras P.
Заглавие : Cu and Gd co-doped BaCeO3 proton conductors: Experimental vs SEM image algorithmic-segmentation results
Место публикации : Electrochimica Acta. - 2014. - Vol. 125. - С. 371-379.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электропроводность--церат бария--твердые растворы--оксид меди--проводимость
Аннотация: Segmentation algorithms for the quantitative description of the surface microstructure and the evaluation of the grain-boundary conductivity of ceramic materials surface using SEM microphotographs analysis was developed and applied in the present work for first time in barium cerate based solid solutions. To this purpose novel polycrystalline ceramic materials based on Cu and Gd co-doped BaCeO3 proton conductors exhibiting high proton conductivity have been prepared and characterized. The influence of copper oxide as a dopant on the microstructure and the electrical properties of BaCe0.9–xGd0.1CuxO3–δ (0≤x≤0.1) have been examined in detail. It is shown that the dependence of the electrical conductivity is correlated with the average oxide grain diameter variation in air at various temperatures. Moreover, it was found that the algorithmic segmentation evaluation results are in good agreement with the experimental ones, verifying the considerable contribution of the grain-boundary conductivity to the electrical transport of Cu and Gd co-doped BaCeO3 proton conductors.
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4.

Вид документа :
Шифр издания : 54/C 94
Автор(ы) : Ananyev M., Medvedev D., Gavrilyuk A., Mitri S., Demin A., Malkov V., Tsiakaras P.
Заглавие : Cu(+) and Cu(2+) diffusion coefficients in low-melting alkali halide mixtures
Место публикации : Electrochimica Acta . - 2014. - Vol. 125. - С. P .371-378.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): оксид меди--проводимость--церат бария--протонная проводимость
Аннотация: Segmentation algorithms for the quantitative description of the surface microstructure and the evaluation of the grain-boundary conductivity of ceramic materials surface using SEM microphotographs analysis was developed and applied in the present work for first time in barium cerate based solid solutions. To this purpose novel polycrystalline ceramic materials based on Cu and Gd co-doped BaCeO3 proton conductors exhibiting high proton conductivity have been prepared and characterized. The influence of copper oxide as a dopant on the microstructure and the electrical properties of BaCe0.9–xGd0.1CuxO3–δ (0≤x≤0.1) have been examined in detail. It is shown that the dependence of the electrical conductivity is correlated with the average oxide grain diameter variation in air at various temperatures. Moreover, it was found that the algorithmic segmentation evaluation results are in good agreement with the experimental ones, verifying the considerable contribution of the grain-boundary conductivity to the electrical transport of Cu and Gd co-doped BaCeO3 proton conductors.
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5.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Lipilin A. S., Ivanov V. V., Shkerin S. N., Nikonov A. V., Khrustov V. R.
Заглавие : Electroconductivity of the bulk and grain boundaries in the 0.8CeO2-0.2Gd2O3 electrolyte prepared from nanopowders
Место публикации : NATO Science Series, II: Mathematics, Physics and Chemistry. - 2005. - № 202: Fuel Cell Technologies. - С. 265-270
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The impedance spectroscopy method was used to study conductivity of a ceramic oxygen-conduction electrolyte of the formula Ce0.8Gd0.2O1.9, which was prepared by radial magnetic pulse compaction of nanopowders and their subsequent sintering
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Salyulev A. B., Vovkotrub E. G., Strekalovsky V. N.
Заглавие : Investigation of interaction PCl5 with LnCl3 (Ln-rare earth elements)
Место публикации : Phosphorus, sulfur and silicon. - 1999. - V. 147. - С. 369
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): химия--p--pcl5--фосфор--хлорид фосфора--пентахлорид фосфора--элементы редкоземельные--редкоземельные элементы--хлориды редкоземельных металлов--металлы редкоземельные--редкоземельные металлы--lacl3--la--cecl3--ce--церий--хлорид церия--prcl3--празеодим--хлорид празеодима--pr--smcl3--самарий--хлорид самария--sm--gdcl3--gd--гадолиний--хлорид гадолиния--tbcl3--хлорид тербия--тербий--tb--ercl3--er--хлорид эрбия--эрбий--ybcl3--иттербий--хлорид иттербия--yb--ycl3--y--иттрий--sccl3--скандий--хлорид скандия--sc--хлорид лантана--лантан--хлорид иттрия
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7.

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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8.

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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9.

Вид документа : Статья из журнала
Шифр издания : 54/T 44
Автор(ы) : Pikalova E. Yu., Maragou V. I., Demina A. N., Demin A. K., Tsiakaras P. E.
Заглавие : The effect of co-dopant addition on the properties of Ln0.2Ce0.8O2 дельта (Ln=Gd, Sm, La) solid-state electrolyte
Место публикации : Journal of Power Sources. - 2008. - Vol. 181, № 2. - С. 199-206: рис. - ISSN 0378-7753. - ISSN 0378-7753
Примечания : Библиогр.: p. 206 (21 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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10.

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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