Abstract
Dilute solutions of vanadium, tantalum and molybdenum chlorides in LiCl-KCl eutectic melt were prepared by anodic dissolution of the metals. The equilibrium between the solution and the metal was studied at a temperature range between 500 and 675°C with Ag/AgCl (0·040 mole fraction) + LiCl-KCl eutectic reference electrode. The apparent valency of the metal ion in the melt immediately after the anodic dissolution was determined by Faraday's law, while in the equilibrated melt it was determined by Faraday's law and the slope of isothermal plots of the electrode potential vs the logarithm of the concentration. It was shown that V2+, Ta4+ and Mo3·1+ are the species existing in the vanadium, tantalum and molybdenum chloride melts (within 1 × 10−3 to 2 × 10−2 mole fraction) immediately after the anodic dissolutions of the metals, and that V2+, Ta4+ and Mo3+ are the species in the equilibrated melts. The effects of electron-beam zone-refining of the metals were also studied.These results are compared with the results on niobium.
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