PREPARATION FOR BA-FERRITE POWDER

Barium ferrite microcrystalline powders of formula BaOn(Fel-mMm)2O3 (where M is Co, Ti, Ni, Mn, Cu, Zn, In, Ge, and/or Nb, m is 0-0.2, and n is 5.4-6.0) are prepared by adding a first soln. contg. 0.01 N alkali, Ba ions, Fe(III) ions and opt. M ions to a second soln. contg. the balance of the compos...

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Bibliographische Detailangaben
Hauptverfasser:	IIRI SIGEO, ENDO HIROSI, OKUCHI THOSIHIKO, AWA MASASI
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CONCRETE ELECTRICITY INDUCTANCES INORGANIC CHEMISTRY LIME, MAGNESIA MAGNETS METALLURGY REFRACTORIES SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SLAG TRANSFORMERS TREATMENT OF NATURAL STONE
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Zusammenfassung:	Barium ferrite microcrystalline powders of formula BaOn(Fel-mMm)2O3 (where M is Co, Ti, Ni, Mn, Cu, Zn, In, Ge, and/or Nb, m is 0-0.2, and n is 5.4-6.0) are prepared by adding a first soln. contg. 0.01 N alkali, Ba ions, Fe(III) ions and opt. M ions to a second soln. contg. the balance of the composition before heating the mixt. to 150-300oC at a const. volume. The resulting hexagonal ppts. is separated and baked at 700-1000oC to give the desired power of particle size up to 0.5 microns. Method produces a powder with a narrow particle size distribution suitable for use in magnetic recording tape.