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2000 (1)
1999 (1)
1Author    Masahiko Matsumiya, Masatoshi Takano, Ryuzo Takagi, Reiko FujitaRequires cookie*
 Title    Electrochemical Behavior of Ba 2+ at Liquid Metal Cathodes in Molten Chlorides  
 Abstract    The electrochemcal behavior of Ba 2+ on several liquid metal electrodes (AI, Bi, Cd, Pb, Sn and Zn) in a NaCl-KCl equimolar solvent at 1000 K has been investigated by means of cyclic voltammetry and chronopotentiometry. The kinetic parameters and the diffusion coefficient for Ba 2+ were determined by cyclic voltammetry with conventional, semi-integral, semi-differential methods and chronopotentiometry. It was revealed that on a liquid Pb electrode in the NaCl-KC1 system at 1000 K the quasi-reversible cathodic reaction Ba 2+ + 2e~ + Pb —> BaPb takes place. In addition, the kinetic parameters and the diffusion coefficient agree well with the values determined by various electroanalyses. The possibility of alloy formation between Ba and Sn was also demonstrated in this paper. 
  Reference    Z. Naturforsch. 54a, 739—746 (1999); received September 13 1999 
  Published    1999 
  Keywords    Alloy Formation Reaction, Barium, Liquid Metal Cathodes, Molten Salts 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0739.pdf 
 Identifier    ZNA-1999-54a-0739 
 Volume    54 
2Author    Masahiko Matsumiya, Ryuzo TakagiRequires cookie*
 Title    Electrochemical Impedance Spectroscopic Study on Eu 2+ and Sr 2+ Using Liquid Metal Cathodes in Molten Chlorides  
 Abstract    For the pyrochemical reprocessing of spent metallic nuclear fuels in molten salt baths it is important to investigate the behavior of the electrochemically negative elements Eu and Sr, which are significant fission products. Voltammetric and chronopotentiometric studies have shown that the reduction of Eu 2+ and Sr 2+ on liquid Pb cathodes in molten chloride baths at 1073 K follows the alloy formation reaction: Eu 2+ + 2e~ + 3Pb — • EuPb 3 and Sr 2+ + 2e~ + 3Pb — • SrPb 3 . In the present work these alloy formation reactions were studied by electrochemical impedance spectroscopy. Analysis of the spectra showed that the electronic exchange of Eu 2+ /Eu and Sr 2+ /Sr is quasi-re-versible. Moreover, the experimental results allowed the determination of the kinetic parameters of EU 2+ /EU and Sr 2+ /Sr, the diffusion coefficients of these species in molten chloride baths, and also the diffusion layer thickness. 
  Reference    Z. Naturforsch. 55a, 673—681 (2000); received April 25 2000 
  Published    2000 
  Keywords    Alloy Formation Reaction, Europium, Impedance, Liquid Metal Cathodes, Molten Salts, Strontium 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0673.pdf 
 Identifier    ZNA-2000-55a-0673 
 Volume    55