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Fine Nb 2 O 5 powder was filled into a basket-type cathode and immersed in molten CaCl 2 –0.5mol% CaO at 1173K. Nb 2 O 5 immediately reacted with CaO in the molten CaCl 2 and formed calcium niobites that exhibited rod- or plate-like morphology. After the electrolysis of CaO with a graphite consumable anode, spherical particles of metallic niobium powder...