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AssigneeShowa Denko K.K.
InventorsIsao Kabe, Kazumi Naito
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A nitrogen-containing niobium particle for capacitors is heated in an inert gas atmosphere, preferably in a vacuum, to obtain a niobium particle where the average nitrogen concentration in the region between a depth of 50 nm and a depth of 200 nm from the surface of the niobium particle is from 0.3 to 4% by mass and preferably, the average nitrogen concentration in the region from the particle surface to a depth of 50 nm is from 0.2 to 1% by mass. This niobium particle is sintered to obtain a sintered body. Using this niobium particle as one part electrode, a dielectric material is provided on the surface of the sintered body and a counter electrode is provided on the dielectric material, whereby a niobium capacitor reduced in the leakage current is obtained.
A niobium particle, which is a nitrogen-containing niobium particle for capacitors, wherein the average nitrogen concentration in the region between a depth of 50 nm and a depth of 200 nm from the particle surface is from 0.3 to 4% by mass.
A capacitor comprising a niobium sintered body as one part electrode, a dielectric material provided on the surface of the sintered body, and a counter electrode provided on said dielectric material, wherein the niobium sintered body as one part electrode has an average nitrogen concentration of 0.3 to 4% by mass.
Dependencies are inferred from the claim text.