A solid electrolytic capacitor includes an anode and a dielectric layer. The anode is made of niobium or a niobium alloy. The dielectric layer is made of niobium oxide formed on the niobium or the niobium alloy. The niobium oxide has a feature that a full width at half maximum of a peak of an Mz ray of characteristic X-rays of niobium is 0.98 Å or more. The characteristic X-rays are emitted when the niobium oxide is irradiated with an electron beam.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view showing a configuration of a solid electrolytic capacitor of the present invention.
FIG. 2 is a view showing a peak of an Mz ray of characteristic X-rays of niobium of a solid electrolytic capacitor of Example 1.
Claims
1. A solid electrolytic capacitor comprising:
an anode made of niobium or a niobium alloy; anda dielectric layer made of niobium oxide formed on a surface of the niobium or the niobium alloy; wherein,a full width at half maximum of a peak of an Mz ray of characteristic X-rays of niobium, which are emitted when the niobium oxide is irradiated with an electron beam, is 0.98 Å or more.
2. The solid electrolytic capacitor according to claim 1, wherein the full width at half maximum of the peak of the Mz ray of the characteristic X-rays of niobium is 1.00 Å or more.
3. A method of manufacturing a solid electrolytic capacitor, comprising the step of:
forming a dielectric layer made of niobium oxide by anodizing an anode made of niobium or a niobium alloy in a solution selected from the group of a formic acid solution, a tartaric acid solution and a citric acid solution.
4. The method of manufacturing a solid electrolytic capacitor according to claim 3, wherein the formic acid solution, the tartaric acid solution or the citric acid solution, used in the step of forming the dielectric layer, has a concentration of 0.05 wt % or more.
Patent Application
20070188981
