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US 7,341,705 B2Granted
Process for producing niobium suboxide
AssigneeH.C. Starck GmbH
InventorChristoph Schnitter
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Abstract
A method is described for preparing a niobium suboxide represented by the formula, NbOx, in which 0.7<x<1.3. The method involves reacting NbOy (in which y<1.8<2.1) with a stoichiometric amount of niobium metal, in the presence of hydrogen. The niobium suboxide produced by such method may be used to fabricate anodes for solid electrolyte capacitors.
Claims11
A method of producing NbOx consisting essentially of the sequential steps of
- A) producing NbOy, wherein 1.8<y<2.1, by reducing niobium pentoxide under flowing hydrogen at a hydrogen partial pressure of 50 to 1100 mbar, the temperature during the reduction of the pentoxide to form the dioxide is to be gradually increased from a starting temperature in the range from 1,000° C. to 1,100° C. to a temperature in the range from 1300° C. to 1600° C. the temperature in the range of 1300° C. to 1600° C. being a maximum temperature, and the NbOy is held at a temperature of from 900° C. to 1600° C. in order to stabilize and densify the NbOy lattice and then
- B) reacting said NbOy with a stoichiometric quantity of niobium metal, in the presence of hydrogen, wherein for NbOx, 0.7<x<1.3, said.
Dependencies are inferred from the claim text.