Papers by Author: J. Sytchev

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Authors: P. Baumli, J. Sytchev, Zs.H. Göndör, György Kaptay
Abstract: In the present paper the chemical interaction between an alumina plate and a one-phase NaCl-KCl-K2TiF6 as well as two-phase NaCl-KCl-K2TiF6/Ti system has been studied experimentally at 700 oC during 2 hours, as function of K2TiF6 content of the melt. In all experiments the reaction product TiO2 of an exchange reaction has been found at the surface of the alumina plate. Its thickness changes through a maximum point as function of the K2TiF6-content of the melt, as a result of the competition of two processes: the exchange reaction leading to the formation of the TiO2 layer, and its dissolution in the melt.
Authors: J. Sytchev, N. Borisenko, György Kaptay
Abstract: The mechanism of lithium electrochemical reduction from its molten chloride at two different electrodes – glassy carbon and graphite – has been investigated by the cyclic voltammetry method in terms of so-called ‘thermodynamic’ or ‘material balance’ reversibility. It has been shown that the adsorption of lithium on glassy carbon and graphite plays an important role in the overall process of reduction, especially at polarization rates below 1 V/s. Lithium intercalation, probably due to small lithium atomic radius, practically does not have influence on the reversibility at these polarization rates. The process of lithium deposition on the electrodes used may be complicated by the dissolution of lithium in the melt in the whole range of polarization rates applied.
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