Abstract Tantalum was prepared by electro-deoxidation in a CaCl2-NaCl melt at 800℃. Ta2O5 powders were compacted in to pellets and sintered, and then conducted as a cathode, while a high-density graphite rod as an anode. It was investigated that the porosity and micro-morphology of the sintered Ta2O5 cathode affected the rate of the electro-chemical reduction and the purity of the product. The results showed that high porosity can increase the rate and extent of electro-deoxidation. The diffusion seemed to play an important role in the reduction process.
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