| 摘要 |
<p>A capacitor having large capacitance per unit weight and preferred LC characteristics is provided. The capacitor includes a dielectric material between two electrodes, and the dielectric material has a two-layer structure which includes a first layer whose main ingredient is niobium oxide, NbOx (X=2.5), and a second layer whose main ingredient is a compound of niobium oxides, NbOx (X=2.5) and NbOx (X=2.0). Both the first and second layers of the dielectric material contain 90% or more NbOx by weight. The molar ratio between NbOx (X=2.5) and NbOx (X=2.0) in the second layer is 1:4 to 4:1. Preferably, the proportion of the first layer in the two-layer structure is 0.01 to 10% by volume. Preferably, one of the electrodes partly contains niobium nitride, which in particular is made by nitrogenation of sintered niobium.</p> |
