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filingDate 1998-03-02-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_53ba84172b45b1798e7ebe2f007bb56c
publicationDate 1999-09-14-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber JP-H11246224-A
titleOfInvention Spindle-shaped goethite particle powder and method for producing the same
abstract PROBLEM TO BE SOLVED: To provide a spindle-shaped goethite particle powder suitable as a starting material for obtaining a spindle-shaped metal magnetic particle powder. SOLUTION: It is contained uniformly in the range of 1 to 20 atom% in terms of Co and in the range of 1 to 15 atom% in terms of Al with respect to all Fe, and has an X-ray crystal grain size ratio D 020. / D 110 Is a powder comprising spindle-shaped goethite particles having a mean major axis diameter of 0.05 to 0.20 μm. m, average minor axis diameter 0.010-0.020 μm, average axis ratio 4-10. After aging the aqueous suspension containing the ferrous-containing precipitate by the reaction between the mixed aqueous alkali solution and the aqueous ferrous salt solution for 30 to 300 minutes in a non-oxidizing atmosphere, the oxidative reaction produces spindle-shaped goethite particles. After adding 1 to 15 atom% of an Al compound in terms of Al with respect to all Fe and aging, the Co compound is converted into 1 in terms of Co with respect to Fe. It is added in the range of 2020 atomic%.
priorityDate 1998-03-02-04:00^^<http://www.w3.org/2001/XMLSchema#date>
type http://data.epo.org/linked-data/def/patent/Publication

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