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Title:
NIOBIUM OXIDE POWDER AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH0323222
Kind Code:
A
Abstract:

PURPOSE: To obtain the powder having suitable fineness useful for ceramic capacitors, etc., by selecting Nb2O5 powder having specific properties.

CONSTITUTION: The Nb2O5 powder which is produced by precipitating preferably hydrated niobium oxide with NH3 water from a soln. contg. fluoride and subjecting the precipitate to filtering, washing, annealing and pulverizing under specific conditions, comprises a T phase up to ≥90 wt.% and has the following property values is selected: A fluorine value ≤1,000 ppm, 45 μ sieve pass ≥99.9 wt.%, a specific surface area by BET ≤3.5 m2/g, Nb2O5 content ≥99.8 wt.% (loss at the time of annealing is not considered), Fe: 2 to 20 ppm, Ni: 2 to 30 ppm.


Inventors:
BARUTAA BURUTOSUSU
ERUKUURIYUDEIGAA FUOIERUHAAN
HORUSUTO TSUIMAAMAN
Application Number:
JP14751090A
Publication Date:
January 31, 1991
Filing Date:
June 07, 1990
Export Citation:
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Assignee:
STARCK HERMANN C FA
International Classes:
C01G33/00; (IPC1-7): C01G33/00
Domestic Patent References:
JPS5110197A1976-01-27
JPS4930354A1974-03-18
Attorney, Agent or Firm:
Heiyoshi Odashima



 
Next Patent: JPH0323223