IP Library › Granted Patent US 7,833,511
Granted Patent B2
US 7,833,511 · App. 12/261,635 · Granted Nov 16, 2010

Capacitor powder

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Quick Facts
Patent No.
US 7,833,511
App. No.
12/261,635
Granted
Nov 16, 2010
Kind
B2
Abstract

Disclosed herein are capacitors having an anode based on niobium and a barrier layer based on niobium pentoxide, at least the barrier layer having a content of vanadium and process for their preparation and use.

Claims (7)

1. Conductive niobium compounds selected from the group of NbOx, wherein x is from 0.8 to 1.2 or niobium oxynitrides, having a content of vanadium from 10 to 100,000 ppm.

2. Conductive niobium compounds of claim 1 , having a content of vanadium from 500 to 10,000 ppm.

3. Conductive niobium compounds of claim 1 , wherein the niobium compounds have an oxygen content of from 3,000 to 4,500 ppm per m 2 of specific surface area.

4. Conductive niobium compounds of claim 1 , wherein the niobium compounds have an impurity content of Fe, Cr, Ni, Al, Na and K in amounts of less than 25 ppm for each element and less than a total of 100 ppm for all elements.

5. An anode based on the niobium compound of claim 1 .

6. The anode of claim 5 , based on niobium compound with BIAS-independent capacitance.

7. The anode of claim 5 , wherein the vanadium is present as a surface coating.