公开(公告)号：JPS5663824A

公开(公告)日：1981-05-30

申请号：JP14585280

申请日：1980-10-20

Applicant: BASF AG

Inventor： MANFUREETO OORINGAA ,  GIYUNTAA FUEETO ,  NORUBAATO MIYURAA ,  OIGEN BUETOSHIYUTAIN

IPC: C01G37/00 ,  C01G37/027 ,  G11B5/62 ,  G11B5/706 ,  H01F1/11

Abstract: A process for the manufacture of ferromagnetic chromium dioxide modified with foreign elements, by reacting oxides of trivalent and hexavalent chromium under superatmospheric pressure at an elevated temperature in the presence of water and of antimony(III) oxide as modifier, with or without other modifiers in an amount not exceeding 15% by weight, wherein the antimony(III) oxide employed as modifier is, to the extent of more than one-third, present as the senarmontite cubic modification, has a specific surface area, measured by the BET method, of from 1.5 to 15 m2/g, and is added in a total amount of up to 0.5% by weight, based on the resulting chromium dioxide.