| http://www.w3.org/ns/prov#value | - After removing the binder, this molded article is sintered at 500 to 2,000?? C. under reduced pressure to manufacture a niobium sintered body. [0093] The niobium sintered body is electrochemically formed, for example, in a electrolyte solvent such as phosphoric acid and adipic acid of a concentration of 0.1% by mass and 30?? C. to 90?? C. at a voltage from 20 to 60 V for 1 to 30 hours to form a di
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