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1.
Инвентарный номер: нет.
   
   C 47


   
    Characterization of Ni-cermet degradation phenomena I. Long term resistivity monitoring, image processing and X-ray fluorescence analysis / M. V. Ananyev , D. I. Bronin, D. A. Osinkin, V. A. Eremin, R. Steinberger-Wilckens, L. G. J. De Haart, J. Mertens . - [S. l. : s. n.]. - Б. ц.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПОРИСТОСТЬ -- УДЕЛЬНОЕ СОПРОТИВЛЕНИЕ -- ОКСИД ИТТРИЯ -- ОКСИД ЦИРКОНИЯ
Аннотация: The present paper is devoted to Ni-cermet degradation phenomena and places emphasis on experimental approaches and data handling. The resistivity of Ni-YSZ cermet (nickel and 8 mol.% yttria stabilized zirconia) anode substrates was monitored during 3000 h at 700 and 800 °C in a gas mixture of 80 vol.% water vapor and 20 vol.% hydrogen. The experimentally evaluated dependence of resistivity of the Ni-YSZ substrates can be well described by exponential decay functions. Post test analysis by image processing and XRF (X-ray fluorescence) analysis for characterization of the microstructure and elemental composition were carried out for virgin samples and after 300, 1000 and 3000 h of exposure time. The 3D-microstructure was reconstructed using an original spheres packing algorithm. Two processes leading to the Ni-YSZ degradation were observed: Ni-phase particle coarsening and volatilization. The effect of these processes on resistivity and such microstructure parameters as porosity, Ni-phase fraction, Ni and YSZ phases particle size distributions, triple phase boundary length, and tortuosity factor are considered in this paper.

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2.
Инвентарный номер: нет.
   
   O-97


   
    Oxygen reduction on gold electrode in Li2CO3 / K2CO3 (62 / 38 mol %) molten electrolyte: experimental and simulation analysis / V. N. Nekrasov, A. A. Lystsov, O. V. Limanovskaya, N. N. Batalov, M. A. Konopelko // Electrochimica Acta. - 2015. - Vol. 182. - P61-66. - Bibliogr. : p. 68 (35 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КИНЕТИКА -- МОДЕЛИРОВАНИЕ -- ЭЛЕКТРОЛИТ
Аннотация: A kinetic model of oxygen reduction at an inert electrode in a carbonate melt has been proposed. Combined with the thermodynamic calculations of the chemical equilibria in the carbonate melts and with the diffusivity values taken from the literature, the model was used to simulate kinetics of oxygen reduction reaction at a gold electrode in the Li2CO3 / K2CO3 (62 / 38 mol %) molten electrolyte under 0.33 О2 + 0.67 СО2 atmosphere at 923 K for the case of coulostatic pulse perturbation. The simulation has shown that the partial exchange current of the View the MathML source reduction step makes the largest contribution to the overall exchange current, and neutralization of the oxide ion by CO2 controls the rate of the overall electrode process. The total exchange current per one-electron electrode reaction was estimated as 83 mA/cm2. The simulation has demonstrated satisfactory agreement with the experiment.

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3.
Инвентарный номер: нет.
   
   T 44


   
    The Behavior of KBF4 in Potassium-Cryolite-Based Melts / А. Kataev, O. Tkacheva, A. Redkin, A. Rudenko, A. Dedyukhin , Yu. Zaikov // Journal of the Electrochemical Society. - 2015. - Vol. 162, № 4. - PH283-H285
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТЕМПЕРАТУРА ЛИКВИДУСА -- КРИОЛИТ -- ПРОВОДИМОСТЬ
Аннотация: The KBF4 impact on the physical-chemical properties of the KF-AlF3 and KF-NaF(10 wt%)-AlF3 melts with cryolite ratio (CR) 1.3–1.5 was studied at temperatures 700–800°C. The KBF4 additions (up to 15 mol%) to the potassium-cryolite-based electrolytes increase the liquidus temperature, however, the KBF4 presence in the cryolite-alumina melt improves the Al2O3 solubility and enlarges the range of homogeneity in the (cryolite-KBF4)-Al2O3 system. The KBF4 additions (within a concentration range of 0–10 mol%) do not noticeably impact the electrical conductivity of the KF-AlF3-KBF4 melt (CR = 1.3). The mass loss of the KF-AlF3-KBF4 samples with low CR determined by thermogravimetry analysis over two hours is not higher than 3% at temperature 800°C.

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4.
Инвентарный номер: нет.
   
   C 94


   
    Cu(+) and Cu(2+) diffusion coefficients in low-melting alkali halide mixtures / M. Ananyev, D. Medvedev, A. Gavrilyuk, S. Mitri, A. Demin, V. Malkov, P. Tsiakaras // Electrochimica Acta . - 2014. - Vol. 125. - P .371-378.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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.
Инвентарный номер: нет.
   
   Z 19


    Zakiryanova, I. D.
    Correlation between hydroxide ion dynamics and transport properties of hydroxide/chloride melts according to raman spectroscopy data / I. D. Zakiryanova // Journal of Applied Spectroscopy . - 2014. - Vol. 81, № 2. - P. 301-304.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОМБИНАЦИОННОЕ РАССЕЯНИЕ -- ИНЕРЦИЯ -- ЭЛЕКТРОЛИТ
Аннотация: Using data obtained in analysis of the band contour for the totally symmetric stretching vibration of the OH – anion in Raman spectra of hydroxide/chloride ionic melts, a correlation has been established between the orientational relaxation time and effective moment of inertia of the hydroxide ion and the transport properties of the electrolyte.

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6.
Инвентарный номер: нет.
   
   S 89


   
    Structure peculiarities of carbon-coated lithium titanate: raman spectroscopy and electron microscopic study / D. G. Kellerman, V. S. Shalaeva , E. V. Shalaeva, B. A. Tsaryev, E. G. Vovkotrub // Solid State Sciences. - 2014. - Vol. 14, № 1. - С. 72-79
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОМПОЗИТ -- АРГОН -- СПЕКТРОСКОПИЯ -- КОМБИНАЦИОННОЕ РАССЕЯНИЕ
Аннотация: Li4Ti4.92(CrV)0.04O12/C composites were synthesized at 800 °C under a flow of argon/acetylene gas mixture taken in the 40:1volumetric ratio. X-ray diffraction (XRD), thermogravimetric analysis (TGA), magnetic susceptibility, Raman spectroscopy, and electron microscopy (TEM) were used to characterize the phase structure, composition, and morphology of the composites. Transmission electron microscopy and Raman spectroscopy confirmed that carbon exists on the surface of the spinel matrix. The composites proved to have a modified structure in comparison with the pristine spinel phase.

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7.
Инвентарный номер: нет.
   
   I-69


   
    Interaction between SiO2 and a KF–KCl–K2SiF6 Melt / Yu. P. Zaikov, A. V. Isakov , I. D. Zakiriyanova, O. G. Reznitskikh, O. V. Chemezov, A. A. Redkin // Journal of Physical Chemistry B. - 2014. - № 118, № 2. - P. 1584-1588. - Bibliogr. : p. 1587-1588 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РАСТВОРИМОСТЬ -- СПЕКТРОСКОПИЯ -- КОМБИНАЦИОННОЕ РАССЕЯНИЕ -- ДИОКСИД КРЕМНИЯ -- МАСС-СПЕКТРОСКОПИЯ
Аннотация: The solubility mechanism of silica in a fluoride–chloride melt has been determined in situ using Raman spectroscopy. The spectroscopy data revealed that the silica solubility process involved Si–O bond breakage and Si–F bond formation. The process results in the formation of silicate complexes, fluorine-bearing silicate complexes, and silicon tetrafluoride in the melt. Mass spectrometry of the vapor phase over the KF–KCl–K2SiF6 and KF–KCl–K2SiF6–SiO2 melts and differential scanning calorimetry coupled with thermal gravimetric analysis of these melts were performed to verify the silica solubility mechanism.

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8.
Инвентарный номер: нет.
   
   O-97


   
    Oxygen tracer diffusion and surface exchange kinetics in Ba0.5Sr0.5Co0.8Fe0.2O3 − δ / A. Berenov, A. Atkinson, J. Kilner, M. Ananyev, V. Eremin, N. Porotnikova, A. Farlenkov, E. Kurumchin, H. J. M. Bouwmeester, E. Bucher, W. Sitte // Solid State Ionics. - 2014. - Vol. 268, Pt. A. - P102-109
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
бАРИЙ -- СТРОНЦИЙ -- кИСЛОРОД -- МАСС-СПЕКТРОСКОПИЯ -- ТЕПЛООБМЕН -- ТВЕРДООКСИДНЫЕ ТОПЛИВНЫЕ ЭЛЕМЕНТЫ -- Газ-фазовый анализ
Аннотация: The oxygen tracer diffusion coefficient, Db⁎, and the oxygen tracer surface exchange coefficient, k, were measured in Ba0.5Sr0.5Co0.8Fe0.2O3 − δ (BSCF5582) over the temperature range of 310–800 °C and the oxygen partial pressure range of 1.3 × 10− 3–0.21 bar. Several measurement techniques were used: isotope exchange followed by depth profiling (IEDP) within individual single grains or line scanning (IELS) along the sample cross-section and gas-phase analysis (GPA). Surface exchange kinetics was initially found to be slow and presumably inhibited by the formation of a passivating layer on the sample surface. High temperature pre-anneals (900–950 °C) changed the nature of this layer and enhanced surface exchange. Fast bulk oxygen diffusion and surface exchange kinetics were observed after high temperature pre-anneals within the temperature range studied. The activation energies for 18O tracer diffusion and surface exchange at 0.21 bar were 0.72 ± 0.05 and 1.10 ± 0.15 eV, respectively. The tracer diffusion coefficient showed weak dependence upon oxygen partial pressure, whereas the surface exchange coefficient exhibited strong oxygen partial pressure dependence. The microstructure of the samples (the porosity and grain size) had a profound effect on the measured tracer diffusion coefficient.

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9.
Инвентарный номер: нет.
   
   C 74


   
    Conductivity of Gd-doped BaCeO3 protonic conductor in Н2–Н2О–О2 atmospheres / D. A. Medvedev, E. V. Gorbova, A. K. Demin, P. Tsiakaras // International Journal of Hydrogen Energy. - 2014. - Vol. 39, № 36. - P21547-21552. - Bibliogr. : p. 21551-21552 (31 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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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10.
Инвентарный номер: нет.
   
   C 94


   
    Cu and Gd co-doped BaCeO3 proton conductors: Experimental vs SEM image algorithmic-segmentation results / M. Ananyev, D. Medvedev, A. Gavrilyuk, S. Mitri, A. Demin, V. Malkov, P. Tsiakaras // Electrochimica Acta. - 2014. - Vol. 125. - P371-379.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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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