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Общее количество найденных документов : 145
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1.
Инвентарный номер: нет.
   
   S 18


    Salyulev, A.
    Conductivity of some molten chlorides at elevated temperatures I. experimental and calculation techniques for BeCl2, ZnCl2, and PbCl2 / A. Salyulev, A. M. Potapov // Journal of Chemical and Engineering Data. - 2015. - Vol. 60, № 3. - P484-492
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПРОВОДИМОСТЬ ЭЛЕКТРОЛИТИЧЕСКАЯ -- ТЕМПЕРАТУРА -- ЭЛЕКТРОПРОВОДНОСТЬ -- РАСПЛАВЛЕННЫЕ ХЛОРИДЫ
Аннотация: A cell for the electrical conductivity measurements of molten salts at the elevated temperatures and vapor pressures of several tens of atmospheres was constructed. The electrical conductivities of molten BeCl2, ZnCl2, and PbCl2 were measured up to temperatures of (823, 1421, and 1320) K, respectively. The melts density was estimated, and molar conductivities at the same temperatures were calculated.

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2.
Инвентарный номер: нет.
   
   E 27


   
    Effect of iron oxide on the properties of La0.9 Sr0.1 ScO3-α protonics / A. Yu. Stroeva , V. P. Gorelov, A. V. Kuz’min, V. G. Ponomareva , S. A. Petrov // Physics of the Solid State. - 2015. - Vol. 57, № 7. - P1334-1341. - Bibliogr. : p. 1341 (13 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЛЕГИРОВАНИЕ -- ТВЕРДЫЕ ЭЛЕКТРОЛИТЫ -- ЭЛЕКТРОПРОВОДНОСТЬ -- ИМПЕДАНС -- СПЕКТРОСКОПИЯ
Аннотация: The effect of doping on the transport properties of solid electrolytes La0.9Sr0.1ScO2.95 + x FeO1.5 (x = 0.1–15.0 wt % FeO1.5) has been elucidated by investigating the electrical conductivity of these materials by the four-probe method and the impedance method as a function of external parameters, namely, temperature T (150–900°C), oxygen partial pressure pO2 (0.21 × 104–10−15 Pa), and humidity pH2O (0.04–2.35 kPa). Samples of the solid electrolytes have been investigated using X-ray powder diffraction, electron microscopy, and Mössbauer spectroscopy.

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3.
Инвентарный номер: нет.
   
   S 18


    Salyulev, A. B.
    Electrical conductivity of molten ZnCl2 at temperature as high as 1421 K / A. B. Salyulev, A. M. Potapov // Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences. - 2015. - Vol. 60, № 3. - 133-134.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПРОВОДИМОСТЬ ЭЛЕКТРОЛИТИЧЕСКАЯ -- ЦИНК -- ДИХЛОРИД ЦИНКА
Аннотация: The electrical conductivity of molten ZnCl2 was measured in a wide temperature range (ΔT = 863 K) to a temperature as high as 1421 K that is 417 degrees above the boiling point of the salt. At the temperature maximum of the own vapor pressure of the salt reached several megapascals

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4.
Инвентарный номер: нет.
   
   N 33


    Nechaev, G. V.
    Conductivity in sodium-yttrium-silicate and sodium-yttrium-phosphate glass / G. V. Nechaev, S. G. Vlasova, O. G. Reznitskikh // Glass Physics and Chemistry. - 2015. - Vol. 41, № 1. - P64-67. - Bibliogr. : p. 66-67 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭЛЕКТРОПРОВОДНОСТЬ -- ТВЕРДЫЕ ЭЛЕКТРОЛИТЫ -- ИТТРИЙ
Аннотация: Sodium-Yttrium-Silicate glass composed of 35Na2O · 5.3Y2O3 · 59.7SiO2 and 37.9Na2O · 5.7Y2O3 · 56.4SiO2 and silicon—phosphorus glass composed of 37.9Na2O · 5.7Y2O3 · 51.4SiO2 · 5P2O5, which are similar in composition, have been synthesized. Thermal behavior of the above glass has been studied by the methods of dilatometry and DSC. The study of electrical characteristics of glass showed that their electrical conductivity is in the range 8 × 10−9−3 × 10−8 Sm/cm at 25°C, 5 × 10−4−10−3 siemens/cm at 300°C. The obtained values of the electrical conductivity are on the level of the best values known for sodium glassy solid electrolytes. It was found that the introduction of phosphorus oxide leads to a decrease in the conductivity of the glass.

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5.
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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6.
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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7.
Инвентарный номер: нет.
   
   B 12


   
    BaCeO3: Materials development, properties and application / D. Medvedev, A. Murashkina, E. Pikalova, A. Demin, A. Podias, P. Tsiakaras // Progress in Materials Science. - 2014. - Vol. 60. - P72-129
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАТЕРИАЛЫ ОКСИДНЫЕ -- ПРОВОДИМОСТЬ ПРОТОННАЯ -- ПРОВОДИМОСТЬ КИСЛОРОДНАЯ
Аннотация: The characteristic of a number of oxide materials, which include BaCeO3-systems, is their ability to show the proton conductivity along with oxygen-ion conductivity. Such atypical behavior for other oxides attracts great interest in theoretical and experimental solid state electrochemistry. The present review aims at: (a) summarizing the evolution of new functional BaCeO3-based materials with respect to their properties, and properties’ optimization (importance of ceramics’ technology preparation, structural and thermodynamic stability of materials, enhanced ionic conductivity of electrolytes with low electronic contribution, thermal and chemical compatibility with other oxide components), and (b) examining the possibility of their application in various solid oxide electrochemical devices

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8.
Инвентарный номер: нет.
   
   A 60


   
    Anodic behavior of the NiO-Fe2O3-Cr2O3-Cu composite during the low-temperature electrolysis of aluminum / V. A. Kovrov, A. P. Khramov, Yu. P. Zaikov, V. M. Chumarev, E. N. Selivanov // Russian Journal of Non-Ferrous Metals. - 2014. - Vol. 55, № 1. - P8-14
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ХРОМА -- АНОД -- ЭЛЕКТРОЛИЗ -- РАСТВОРЕНИЕ
Аннотация: In order to fabricate oxide-metallic composites with the composition 25.3NiO-41.2Fe2O3-13.5Cr2O3-20.0Cu (wt %), the temperature and duration of sintering (1350°C, 30 min) that ensure the formation of the solid solution of chromium oxide in nickel ferrite have been determined. This material is tested as an anode for the electrolysis of the low-temperature solution with the composition 12.0NaF-36.8KF-51.2AlF3 (wt %), which was saturated with Al2O3 (t = 800°C). The amount of gaseous oxygen evolved on the anode was measured. It is shown that the main reaction on an anode at current density i = 0.015–1.0 A cm−2 is the oxidation of oxygen-containing anions from a melt with the formation of gaseous O2 and a substantial increase in the oxidation rate of the composite anode is observed at i > 1.0 A cm−2. The voltage across the electrolyzer (4.5 ± 0.5 V) and the anodic potential (2.43 ± 0.2 relative to the Al reference electrode) during a prolonged experiment (for 89 h, i = 0.4 A cm−2) indicate a stable and acceptable electrical conductivity of the material, while the dissolution rate, which was calculated by the weight loss (0.6 kg/yr) and volume loss (0.7 cm/yr), satisfy the requirements to inert anodes.

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9.
Инвентарный номер: нет.
   
   L 81


   
    Lithium stoichiometry of solid electrolytes based on tetragonal Li7La3Zr2O12 / Е. А. Il’inaa, А. А. Raskovalova, P. V. Shevelina, V. I. Voroninb, I. F. Bergerb, N. A. Zhyravlevc // Materials Research Bulletin. - 2014. - Vol. 53. - P. 32-37.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДИОКСИД УГЛЕРОДА -- ЭЛЕКТРОЛИТ -- ЛИТИЙ -- ПРОВОДИМОСТЬ
Аннотация: We propose a simple and effective method to determine the carbonate impurity content in the solid electrolytes. The technique is based on the measurement of the carbon dioxide volume produced from the interaction of the investigated material with acid. Determined in this way, the content of Li2CO3 in the synthesized electrolytes Li7La3Zr2O12, Li8La3Zr2O12.5 and Li9La3Zr2O13 are 1.32 ± 0.04, 1.95 ± 0.06 and 3.49 ± 0.10 wt.%, respectively. From the obtained data, the actual lithium content per formula unit of complex oxide was calculated for the synthesized compounds. The composition with x = 9 had the highest total conductivity, σ = 7.5 × 10−6 S cm−1, at room temperature. All the investigated electrolytes have an activation energy of approximately 50 kJ mol−1.

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10.
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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