FEINTEILIGE, SPHAERISCHE, ZWEISCHICHTIGE FESTSTOFFTEILCHEN

Finely divided, spherical, two-layer solid particles having a diameter of from 5 to 100 nm and consisting of (A) from 60 to 70% by weight of a core of spherical, rhombohedral alpha -Fe2O3 having a purity greater than 98% and (B) from 30 to 40% by weight of a shell of a basic metal hydroxide sulfate...

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Bibliographische Detailangaben
1. Verfasser:	MAIR,GUNTHER,DR
Format:	Patent
Sprache:	ger
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 INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INORGANIC CHEMISTRY LIME, MAGNESIA MAGNETS METALLURGY PHYSICS REFRACTORIES SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SLAG TRANSFORMERS TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	Finely divided, spherical, two-layer solid particles having a diameter of from 5 to 100 nm and consisting of (A) from 60 to 70% by weight of a core of spherical, rhombohedral alpha -Fe2O3 having a purity greater than 98% and (B) from 30 to 40% by weight of a shell of a basic metal hydroxide sulfate which has an alkali metal ion content of less than 500 ppm and is of the general formula MvMnwZnx(OH)y(SO4)z where M is Mg, Co, Ni, Cd, divalent Fe and/or divalent Cu, v is from O to 0.8, w is from 0.1 to 0.9, x is from 0.1 to 0.9, y is from 1.01 to 1.99, z is from 0.005 to 0.505, v++x 1 and 0.5 y+z=1, and a process for the production of finely divided, magnetic, cubic or hexagonal ferrite particles.