Abstract
Electrochemical behavior of KCl-KF-Ta2O5 melts is studied by cyclic voltammetry. It is a Ta(V) oxyfluoride (KTaO2F2, K3TaO2F4, or K3TaOF6), yielded by the Ta2O5-KF interaction in the melt, that presumably participates in the electrochemical process, rather than Ta2O5 proper. The Ta(V) oxyfluoride complex is reduced to tantalum metal at 973 K via three irreversible diffusion-controlled stages. The product of the electrokinetic transfer coefficient and the number of electrons participating in the third stage is determined. The Ta(V) reduction becomes one-staged at 1073 K. Tantalum-containing ternary systems with molybdenum, cobalt, or silicon are prepared by electrolyzing Ta2O5-containing melts.
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