H - Electricity – 01 – F
Patent
H - Electricity
01
F
31/118
H01F 1/00 (2006.01) C01G 37/02 (2006.01) C01G 37/027 (2006.01) G11B 5/706 (2006.01) H01F 1/06 (2006.01)
Patent
CA 1090555
ABSTRACT OF THE DISCLOSURE: The present invention relates to a process for preparing ferromagnetic chromium dioxide and an improved product produced by said process. More particularly, the present invention relates to a process for preparing modified ferromagnetic chromium dioxide by thermal decomposition of hydrated chromium (III) chromate under high pressure, characterized in that a mixture of Cr2(CrO4)3?nH20 is prepared, in which n is comprised between 8 and 12, with small amounts of a substance selected from the group consisting of rhutenium, tellurium, rhutenium containing compounds and tellurium containing compounds, and heating the mixture to temperatures ranging from 250°C to 500°C under a pressure of at least 80 atmospheres. The process of this invention provides a simple and economical process for preparing modified chromium dioxide. It permits one to obtain a product having a good coercive force without reducing in an appreciable degree the product's saturation magnetization. The product produced by the present process exhibits good granulometry characteristics.
264248
Basile Giampiero
Mazza Antonio
Montedison S.p.a.
Robic Robic & Associes/associates
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