Abstract
By using cyclic and linear sweep voltammetry, the electrochemical deposition behaviors of Mg 2+ and B 3+ in fluorides molten salts of KF-MgF 2 and KF-KBF 4 at 880 °C were investigated, respectively. The results show that the electrochemical reduction of Mg 2+ is a one-step reaction as Mg 2++2e −→Mg in KF-1%MgF 2 molten salt, and the electrochemical reduction of B 3+ is also a one-step reaction as B 3++3e −→B in KF-KBF 4 (1%, 2% KBF 4) molten salts. Both the cathodic reduction reactions of Mg 2+ and B 3+ are controlled by diffusion process. The diffusion coefficients of Mg 2+ in KF-MgF 2 molten salts and B 3+ in KF-KBF 4 molten salts are 6.8×10 −7 cm 2/s and 7.85×10 −7 cm 2/s, respectively. Moreover, the electrochemical synthesis of MgB 2 by co-deposition of Mg and B was carried out in the KF-MgF 2-KBF 4 (molar ratio of 6:1:2) molten salt at 750 °C. The X-ray diffraction analysis indicates that MgB 2 can be deposited on graphite cathode in the KF-MgF 2-KBF 4 molten salt at 750 °C.
Published Version
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