Electrolytic Dissolution and Deposition of Overpotentials of Tantalum in KCl Melts

概要

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As part of electrochemical studies on tantalum, the electrolytic dissolution and deposition of solid tantalum in molten salt were studies by measuring its overpotentials in a steady state. The measurements were carried out using the dc current polarization technique in the concentration range of 2.00×10−4–2.79×10−1 mole fraction at temperatures between 775 and 875 °C. The kinetic parameters (the exchange current densities, the transfer coefficients, the kinetic averaged valences, and the apparent activation energies) were determined for the anodic and the cathodic reactions in the Tafel region. The over-all reaction was indicated as: (m1+m2)Ta2++(2m1−2m2)e\rightleftarrowsm1Ta0+m2Ta4+ The Ta2+ ion was previously supposed not to form a complex ion; the Ta4+, however, was a complex ion which decomposed at above 850 °C.
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