Capacitor powder
View Patent ↗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.
1. A capacitor having an anode based on niobium and comprising a barrier layer based on niobium pentoxide, said anode having a content of vanadium at least in said barrier layer, and said capacitor having BIAS-independent capacitance.
2. The capacitor of claim 1 having a vanadium content of from 10 to 100,000 ppm.
3. The capacitor of claim 2 having a vanadium content of from 500 to 10,000 ppm.
4. The capacitor of claim 1 , wherein the anode comprises a member selected from the group consisting of niobium metal, niobium suboxide, niobium nitride, niobium oxynitride and combinations thereof.
5. The capacitor of claim 1 , wherein the anode comprises a niobium-tantalum alloy.
6. The capacitor of claim 5 , wherein the anode contains from 10 to 100,000 ppm vanadium.
7. The capacitor of claim 6 , wherein the anode contains from 500 to 10,000 ppm vanadium.
8. A capacitor having an anode based on niobium and comprising a barrier layer based on niobium pextoxide, wherein said capacitor has BIAS-independent capacitance, said anode has a content of vanadium at least in said barrier layer, and said barrier layer contains from 10 to 10,000 ppm vanadium, based on the total anode mass.