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Общее количество найденных документов : 107
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1.

Вид документа : Статья из журнала
Шифр издания : 54/M 38
Автор(ы) : Shurov N. I., Anfinogenov A. I., Chebykin V. V., Zyryanov V. G.
Заглавие : Mass transfer of d-metals in ionic-electronic melts
Место публикации : Progress in Molten Salt Chemistry: Proceedings from the EUCHEM 2000 Conference on Molten Salts (Denmark, August 20-25, 2000). - V. 1. - С. 487-491
Примечания : Bibliogr.: p. 491 (10 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): массоперенос--d-металлы--расплав ионно-электронный--licl--licl-li--cacl2-ca--ca--bacl2-ba--cacl2--bacl2--ba--кальций--хлорид лития--литий--хлорид кальция--барий--хлорид бария--расплав хлоридный--хлорид расплавленный--покрытие диффузионное
Аннотация: Isothermal mass transfer of d-metals in ionic-electronic melts LiCl-Li, CaCl2-Ca, BaCl2-Ba was examined for the first time. Experiments were performed in the atmosphere of purified argon in containers made of low-carbon steel. the transfer process was checed by weighing the sample's substrate and also by the methods of metallographic and X-ray microanalysis of the surface layer and cross microsections. The mass transfer was analyzed as Mn, Mo, Ni, Co, Cr - Fe in the LiCl-Li melt, Mn, Cr - Fe and Mn - Ti in the CaCl2-Ca melt, and Mo, Cr, Ni - Fe and Cu - Ni in the BaCl2-Ba melt. The direction of transfer in ionic-electronic melts was from less soluble to more soluble metals. We hypothesize that d-metals are transferred by their anions Me(n-) in ionic-electronic melts
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2.

Вид документа : Статья из журнала
Шифр издания : 54/O-97
Автор(ы) : Nekrasov V. N., Lystsov A. A., Limanovskaya O. V., Batalov N. N., Konopelko M. A.
Заглавие : Oxygen reduction on gold electrode in Li2CO3 / K2CO3 (62 / 38 mol %) molten electrolyte: experimental and simulation analysis
Место публикации : Electrochimica Acta. - 2015. - Vol. 182. - С. 61-66
Примечания : Bibliogr. : p. 68 (35 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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.

Вид документа :
Шифр издания : 54/T 44
Автор(ы) : Kataev А. , Tkacheva O., Redkin A., Rudenko A., Dedyukhin A., Zaikov Yu.
Заглавие : The Behavior of KBF4 in Potassium-Cryolite-Based Melts
Место публикации : Journal of the Electrochemical Society. - 2015. - Vol. 162, № 4. - С. H283-H285
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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.

Вид документа : Статья из журнала
Шифр издания : 54/Z 19
Автор(ы) : Zakiryanova I. D., Nikolaeva E. V., Bove A. L.
Заглавие : In situ investigation of the mechanism of bao dissolution in chloride melts by raman spectroscopy
Место публикации : Journal of Applied Spectroscopy . - 2015. - Vol. 81, № 6. - С. 919-923
Примечания : Bibliogr. : p. 922-923 (16 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): спектроскопия--рассеяние комбинационное--оксид бария
Аннотация: The mechanism of BaO dissolution in a melt of the BaCl2–KCl–NaCl eutectic mixture was determined in situ using Raman spectroscopy. The types, structures, and compositions of oxychloride groups present in the melt were established. It was found that BaO dissolution proceeded according to the reaction BaO (s) + [BaCl6] 4– (soln.) →[Ba2OCl6]4– (soln.) and was accompanied by the appearance of [Ba2OCl6] 4– groups (D3d symmetry) of a mixed oxychloride composition
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5.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Zaykov Y. P., Zhuk S. I., Isakov A. I., Grishenkova O. V., Isaev V. A.
Заглавие : Electrochemical nucleation and growth of silicon in the KF-KCl-K2SiF6 melt
Место публикации : Journal of Solid State Electrochemistry. - 2015. - Vol. 19, № 5. - С. 1341-1345
Примечания : Библиогр.: с. 1345 (36 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): кремний--электроосаждение--зародышеобразование--рост--циклотетрафосфат марганца--хроноамперометрия--коэффициент диффузии
Аннотация: The work related to the study of the initial stages of the silicon electrodeposition on the glassy carbon electrode in molten KF-KCl-K2SiF6 was performed. The silicon nucleation and growth process was investigated using cyclic voltammetry, chronoamperometry, and scanning electron microscopy. It was shown that the electrocrystallization process occurs by the instantaneous nucleation with diffusion-controlled growth under the studied conditions. The Scharifker-Hills theoretical model was used to calculate the nucleation density and the diffusion coefficient of depositing ions.
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6.

Вид документа : Статья из журнала
Шифр издания : 54/C 16
Автор(ы) : Zaikov Y. P., Batukhtin V. P., Shurov N. I., Ivanovskii L. E., Suzdaltsev A. B.
Заглавие : Calcium Production by the Electrolysis of Molten CaCl2—Part I. Interaction of Calcium and Copper-Calcium Alloy with Electrolyte
Место публикации : Metallurgical and Materials Transactions B. - 2014. - Vol. 45, № 3. - С. 961-967.
Примечания : Bibliogr. : p. 967 (15 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электролиз--сплав--cacl2 --выход по току
Аннотация: This paper describes the interaction between calcium and molten CaCl2 and the solubility of calcium in this melt, depending on the calcium content in the copper-calcium alloy that comes in contact with the molten CaCl2. The negative influence of the dissolved calcium on the current efficiency was verified. The negative effects of moisture and CaO impurities on the calcium current efficiency were demonstrated. The dependence of the current efficiency and the purity of the metal obtained by the electrolysis conditions were studied in a laboratory electrolyzer (20 to 80 A).
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7.

Вид документа : Статья из журнала
Шифр издания : 54/I-69
Автор(ы) : Zaikov Yu. P., Isakov A. V., Zakiriyanova I. D., Reznitskikh O. G., Chemezov O. V., Redkin A. A.
Заглавие : Interaction between SiO2 and a KF–KCl–K2SiF6 Melt
Место публикации : Journal of Physical Chemistry B. - 2014. - № 118, № 2. - С. . 1584-1588.
Примечания : Bibliogr. : p. 1587-1588 (12 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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.

Вид документа :
Шифр издания : 54/K 84
Автор(ы) : Krotov V. , Filatov Ye.
Заглавие : Anomalous Influence of Electrochemically Inert ZrCl4 on UO2 Current Efficiency During Electrolysis in (NaCl-KCl)equim-UO2Cl2-ZrCl4 Melt
Место публикации : Electrochimica Acta. - 2014. - Vol. 145. - С. 254-258
Примечания : Bibliogr. : p. 257-258 (29 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электролит расплавленный--катодный осадок--uo2-zro2
Аннотация: This paper describes the influence of ZrCl4, which is electrochemically inert under experimental conditions, on uranium dioxide current efficiency during the (NaCl-KCl)equim-UO2Cl2 (10-20 wt.%)-ZrCl4 (0-12 wt.%) melt electrolysis at temperatures of 700 and 750 °C and at electrolysis current densities of 0.08-0.63 A/cm2. An extreme dependence of the uranium dioxide current efficiency on the ZrCl4 concentration and the corresponding minimum and maximum was found. The ZrCl4 influence on the UO2 current efficiency is assumed to be caused by the changes in the mechanism of UO22+ ion reduction to uranium dioxide
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9.

Вид документа :
Шифр издания : 54/S 83
Автор(ы) : Stepanov V. P., Minchenko V. I.
Заглавие : Sound Velocities for Dissolving AgI + LiCl Melts
Место публикации : Journal of Chemical & Engineering Data. - 2014. - Vol. 59, № 11. - С. 3888-3893
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): ультразвук--скорость звука--фазовый переход--температурные зависимости
Аннотация: The ultrasonic velocities of a molten stratified mixture at a molar ratio of 0.3AgI and 0.7LiCl (the composition corresponding to the top of the miscibility gap) were measured along the saturation line over a wide temperature range using the pulse method to establish the characteristics of mixing salts comprising different chemical bonds. It is shown that the coefficients of the temperature dependences for the sound velocities in the coexisting phases have opposite signs as a result of the superposition of the temperature and concentration factors. It is found that the difference, Δu, between the magnitudes of the sound velocities for the coexisting phases decreases with increasing temperature and becomes zero at 1250 K. This temperature corresponds to the critical phase transition point, Tc. The temperature dependence of the sound velocity difference, Δu, for the system studied is described by the equation Δu ≈ (Tc – T)β, where β = 0.900, which is close to the value 0.896 obtained for the previously investigated AgI+NaCl melt but is less than the value found for alkali halide melts (β = 1.02), in which long-range Coulomb forces between ions prevail. The results are discussed in terms of the peculiarity of the chemical bond in silver iodide.
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10.

Вид документа :
Шифр издания : 54/A 60
Автор(ы) : Kovrov V. A., Khramov A. P., Zaikov Yu. P., Chumarev V. M., Selivanov E. N.
Заглавие : Anodic behavior of the NiO-Fe2O3-Cr2O3-Cu composite during the low-temperature electrolysis of aluminum
Место публикации : Russian Journal of Non-Ferrous Metals. - 2014. - Vol. 55, № 1. - С. 8-14
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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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