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Yasuo Arai - One of the best experts on this subject based on the ideXlab platform.
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electrode reaction of the np 3 np couple at liquid cd and bi electrodes in licl kcl eutectic melts
Journal of Applied Electrochemistry, 2004Co-Authors: Osamu Shirai, K Uozumi, Takashi Iwai, Yasuo AraiAbstract:The electrode reactions of the Np 3+ /Np couple at liquid Cd and Bi electrodes were investigated by cyclic voltammetry at 723, 773 and 823 K in the LiCl-KCl eutectic melt. It was found that the diffusion of Np 3+ in the salt phase was the rate-determining step in the cathodic reaction when the concentration of NpCl 3 was less than about 1 wt % and the liquid Cd or Bi phase was not saturated with Np. The redox potentials of the Np 3+ /Np couple at the liquid Cd electrode at 723, 773 and 823 K were observed to be more positive than those at the Mo electrode by 0.158, 0.140 and 0.126 V, respectively. The potential shift results from a lowering of the activity of Np in the Cd phase according to the formation of the NpCd 11 alloy at 723 K and NpCd 6 at 773 and 823 K. The redox potentials of the Np 3+ /Np couple at the liquid Bi electrode at 723, 773 and 823 K were more positive than those at the Mo electrode by 0.427, 0.419 and 0.410 V, respectively, which is attributable to a lowering of the activity of Np in the Bi phase due to the formation of NpBi 2 .
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electrode reaction of the np3 np couple in licl kcl eutectic melts
Journal of Applied Electrochemistry, 2001Co-Authors: Osamu Shirai, Takashi Iwai, Masatoshi Iizuka, Yasuo AraiAbstract:The electrochemical behaviour of the Np3+/Np couple in the LiCl–KCl eutectic salt was investigated by electromotive force measurements, cyclic voltammetry and chronopotentiometry in the temperature region between 723 and 823 K. The standard redox potential of the Np3+/Np couple vs Ag/AgCl (1.00 wt %) was measured and given by the equation, E Np 3+ /Np ° = −2.0298 + 0.000706 T, where E is in V and T in K. The electrode reaction of the Np3+/Np couple was almost reversible under the conditions studied. The diffusion coefficient of Np3+, D Np 3+, in the LiCl–KCl eutectic melts between 723 and 823 K was represented by the equation, D Np 3+ = 2.22 × 10−6 − 6.88 × 10−9 T + 5.60 × 10−12 T 2 cm2 s−1. The adsorption and desorption peaks of Np at the Mo working electrode caused by underpotential deposition were also observed in the cyclic voltammograms, and the work function of Np was evaluated as 3.04 eV by peak analysis of the cyclic voltammograms.
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electrode reaction of pu3 pu couple in licl kcl eutectic melts comparison of the electrode reaction at the surface of liquid bi with that at a solid mo electrode
Analytical Sciences, 2001Co-Authors: Osamu Shirai, Takashi Iwai, Masatoshi Iizuka, Yasuo AraiAbstract:The electrode reaction of Pu3+/Pu couple at the interface between LiCl-KCl eutectic melt containing PuCl3 and liquid Bi phase was investigated by cyclic voltammetry at 723, 773 and 823 K. For comparison, the system was also studied using a solid Mo electrode in place of the liquid Bi electrode. It was found that the electrode reaction of Pu3+/Pu couple at the Bi electrode was almost reversible. The redox potentials of Pu3+/Pu couple at the liquid Bi electrode in the LiCl-KCl eutectic melt containing 0.87 wt% PuCl3 (0.0014 mole fraction) at 723, 773 and 823 K were observed to be more positive by 0.575, 0.572 and 0.566 V, respectively, than those at the Mo electrode. These differences in potential were thermodynamically analyzed by assuming a lowering of the activity of Pu in Bi phase according to the alloy formation of PuBi2.
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electrode reaction of plutonium at liquid cadmium in licl kcl eutectic melts
Journal of Electroanalytical Chemistry, 2000Co-Authors: Osamu Shirai, Takashi Iwai, Masatoshi Iizuka, Yasufumi Suzuki, Yasuo AraiAbstract:The electrode reaction of the Pu3+/Pu couple at the surface of a liquid Cd electrode was investigated by cyclic voltammetry at 723, 773 and 823 K in LiClKCl eutectic melt. It was found that the diffusion of Pu3+ in the salt phase was a rate-determining step in the cathodic reaction, but the dissolution of Pu from the liquid Cd phase was so slow that the anodic wave broadened slightly. The redox potentials of the Pu3+/Pu couple at the liquid Cd electrode at 723, 773 and 823 K were observed at more positive potentials, 0.299, 0.269 and 0.239 V, respectively, than those at a solid Mo electrode. This potential shift was thermodynamically analyzed by a lowering of activity of Pu in the Cd phase due to the formation of the alloy PuCd6 at the interface. As well as the Gibbs energy of formation of PuCd6, the Gibbs energies of formation of the other intermetallic compounds PuCd2 and PuCd4 could also be estimated by the analysis of the anodic peaks in cyclic voltammograms of the Pu3+/Pu redox couple at a Cd-coated Mo electrode.
Valeri Smolenski - One of the best experts on this subject based on the ideXlab platform.
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thermodynamics and separation factor of uranium from lanthanum in liquid eutectic gallium indium alloy molten salt system
Electrochimica Acta, 2014Co-Authors: Valeri Smolenski, Alena Novoselova, A Osipenko, A MaershinAbstract:Abstract This work presents the electrochemical study of lanthanum and uranium compounds in fused 3LiCl-2KCl eutectic vs . Cl − /Cl 2 reference electrode in the temperature range 723–823 K on liquid gallium-indium eutectic alloy. Thermodynamics and the activity coefficients of lanthanum and uranium were studied. The separation factor of uranium from lanthanum on gallium-indium eutectic alloy was determined.
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thermodynamics of separation of uranium from neodymium between the gallium indium liquid alloy and the licl kcl molten salt phases
Electrochimica Acta, 2014Co-Authors: Valeri Smolenski, Alena Novoselova, A Osipenko, M V Kormilitsyn, Ya LukyanovaAbstract:Abstract This work presents the electrochemical study of neodymium and uranium compounds in fused LiCl-KCl eutectic vs . Cl - /Cl 2 reference electrode in the temperature range 723-823 K on liquid gallium-indium eutectic alloy. The activity, solubility and the activity coefficients of neodymium were calculated. The separation factor of uranium from neodymium on gallium-indium eutectic alloy was determined. The obtained data show the perspective of used this system in future innovation method for recovery of nuclear waste.
Gnter Gottstein - One of the best experts on this subject based on the ideXlab platform.
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correlation of plastic deformation and dynamic recrystallization in magnesium alloy zk60
Acta Materialia, 2001Co-Authors: Arthur Galiyev, Rustam Kaibyshev, Gnter GottsteinAbstract:Abstract The mechanisms of plastic deformation and dynamic recrystallization (DRX) in a Mg–5.8% Zn–0.65% Zr alloy were studied by compression tests at temperatures between 423 and 723 K and at strain rates ranging from 10 −5 to 10 −1 s −1 . It was shown that the mechanisms of DRX depended on the operating deformation mechanisms which changed with temperature. Low-temperature DRX (LTDRX below 473 K) was associated with the operation of twinning, basal slip and ( a + c ) dislocation glide. In the intermediate temperature range (473–523 K) continuous DRX (CDRX) was observed and associated with extensive cross-slip due to the Friedel–Escaig mechanism. At temperatures ranging from 573 to 723 K both bulging of original grain boundaries and subgrain growth were the operating DRX mechanisms and controlled by dislocation climb.
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correlation of plastic deformation and dynamic recrystallization in magnesium alloy zk60
Acta Materialia, 2001Co-Authors: Arthur Galiyev, Rustam Kaibyshev, Gnter GottsteinAbstract:Abstract The mechanisms of plastic deformation and dynamic recrystallization (DRX) in a Mg–5.8% Zn–0.65% Zr alloy were studied by compression tests at temperatures between 423 and 723 K and at strain rates ranging from 10 −5 to 10 −1 s −1 . It was shown that the mechanisms of DRX depended on the operating deformation mechanisms which changed with temperature. Low-temperature DRX (LTDRX below 473 K) was associated with the operation of twinning, basal slip and ( a + c ) dislocation glide. In the intermediate temperature range (473–523 K) continuous DRX (CDRX) was observed and associated with extensive cross-slip due to the Friedel–Escaig mechanism. At temperatures ranging from 573 to 723 K both bulging of original grain boundaries and subgrain growth were the operating DRX mechanisms and controlled by dislocation climb.
Keiichi Tomishige - One of the best experts on this subject based on the ideXlab platform.
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catalytic performance of rh ceo2 in the gasification of cellulose to synthesis gas at low temperature
Industrial & Engineering Chemistry Research, 2001Co-Authors: Mohammad Asadullah, Kaoru Fujimoto, Keiichi TomishigeAbstract:The gasification of cellulose has been investigated on Rh catalysts supported on CeO2, ZrO2, Al2O3, TiO2, MgO, and SiO2 at very low temperatures (723−823 K) in a laboratory-scale fluidized-bed reactor using air as a gasifying agent. Of the catalysts, only Rh/CeO2 showed the excellent catalytic performance in the cellulose gasification at above 823 K, resulting in 100% carbon conversion to gas. The details of reaction conditions that affected the performance of the catalyst have been optimized. The best results have been found at above 823 K using the total flow rate of 170 cm3 min-1 of inlet gases. The total carbon conversion was achieved when 50 mg of cellulose was used in a batch. The Rh loading of 1.2 × 10-4 mol (g of catalyst)-1 on CeO2 and W/F of 1.8 gh mol-1 were optima for the total conversion of carbon to gases. Fresh and used catalysts were characterized by a Brunauer−Emmett−Teller (BET) analysis and transmission electron microscopy (TEM). The BET surface area has been decreased from 59 to 24 m2/...
Ya Lukyanova - One of the best experts on this subject based on the ideXlab platform.
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thermodynamics of separation of uranium from neodymium between the gallium indium liquid alloy and the licl kcl molten salt phases
Electrochimica Acta, 2014Co-Authors: Valeri Smolenski, Alena Novoselova, A Osipenko, M V Kormilitsyn, Ya LukyanovaAbstract:Abstract This work presents the electrochemical study of neodymium and uranium compounds in fused LiCl-KCl eutectic vs . Cl - /Cl 2 reference electrode in the temperature range 723-823 K on liquid gallium-indium eutectic alloy. The activity, solubility and the activity coefficients of neodymium were calculated. The separation factor of uranium from neodymium on gallium-indium eutectic alloy was determined. The obtained data show the perspective of used this system in future innovation method for recovery of nuclear waste.
