公开(公告)号：HK56490A

公开(公告)日：1990-08-03

申请号：HK56490

申请日：1990-07-26

Applicant: BASF AG

Inventor： OHLINGER MANFRED DR ,  MUELLER NORBERT DR ,  PETER RUDOLF DR ,  WETTSTEIN EUGEN

IPC: C01G37/027 ,  C09D5/23 ,  H01F1/11 ,  C09D7/12 ,  G11B5/706

Abstract: Ferromagnetic chromium dioxide is prepared by converting oxides of trivalent and hexavalent chromium under superatmospheric pressure and at elevated temperatures in the presence of water and with the addition of an antimony compound as a modifier and, if required, further additives in an amount of not more than 15% by weight, by a method in which the antimony compound is present in the form of a water-soluble salt whose anion contains one or more organic molecular moieties which are oxidized in concentrated chromic acid.

公开(公告)号：DE3837646A1

公开(公告)日：1990-05-10

申请号：DE3837646

申请日：1988-11-05

Applicant: BASF AG

Inventor： MUELLER MICHAEL WOLFGANG DR ,  SCHWAB EKKEHARD DR ,  AUWETER HELMUT DR ,  FESER RAINER DR ,  LEHNERT RUDI DR ,  MUELLER NORBERT DR ,  OHLINGER MANFRED DR

IPC: C01G49/00 ,  C01G37/027 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/11

Abstract: The invention relates to a highly coercive, acicular ferromagnetic material essentially consisting of chromium dioxide with iron, and to a process for its preparation by thermal decomposition of hydrated chromium(III) chromate under elevated pressure.

公开(公告)号：AT49317T

公开(公告)日：1990-01-15

申请号：AT85109558

申请日：1985-07-30

Applicant: BASF AG

Inventor： OHLINGER MANFRED DR ,  MUELLER NORBERT DR ,  PETER RUDOLF DR ,  WETTSTEIN EUGEN

IPC: H01F1/11 ,  C01G37/027 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706