BE858222A - ACICULAR MAGNETIC IRON OXIDE, DOPE WITH COLBALT, AND METHOD FOR PREPARING THIS OXIDE - Google Patents

ACICULAR MAGNETIC IRON OXIDE, DOPE WITH COLBALT, AND METHOD FOR PREPARING THIS OXIDE

Info

Publication number
BE858222A
BE858222A BE180522A BE180522A BE858222A BE 858222 A BE858222 A BE 858222A BE 180522 A BE180522 A BE 180522A BE 180522 A BE180522 A BE 180522A BE 858222 A BE858222 A BE 858222A
Authority
BE
Belgium
Prior art keywords
oxide
colbalt
dope
preparing
magnetic iron
Prior art date
Application number
BE180522A
Other languages
French (fr)
Original Assignee
Basf Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Basf Ag filed Critical Basf Ag
Publication of BE858222A publication Critical patent/BE858222A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70652—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3
    • G11B5/70668—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant
    • G11B5/70673—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant containing Co
BE180522A 1976-09-01 1977-08-30 ACICULAR MAGNETIC IRON OXIDE, DOPE WITH COLBALT, AND METHOD FOR PREPARING THIS OXIDE BE858222A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762639250 DE2639250C2 (en) 1976-09-01 1976-09-01 Process for the production of acicular, cobalt-doped magnetic iron oxide

Publications (1)

Publication Number Publication Date
BE858222A true BE858222A (en) 1978-02-28

Family

ID=5986842

Family Applications (1)

Application Number Title Priority Date Filing Date
BE180522A BE858222A (en) 1976-09-01 1977-08-30 ACICULAR MAGNETIC IRON OXIDE, DOPE WITH COLBALT, AND METHOD FOR PREPARING THIS OXIDE

Country Status (6)

Country Link
JP (1) JPS5330497A (en)
BE (1) BE858222A (en)
DE (1) DE2639250C2 (en)
FR (1) FR2363521A1 (en)
GB (1) GB1583256A (en)
NL (1) NL7709413A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558411A (en) * 1969-05-19 1985-12-10 Burroughs Corp. Polymorphic programmable units employing plural levels of sub-instruction sets
GB1603213A (en) * 1977-04-20 1981-11-18 Hitachi Maxell Cobalt containing iron oxide magnetic particles and method for the preparation of the same
JPS5413997A (en) * 1977-07-04 1979-02-01 Sony Corp Magnetic recording medium and its manufacture
JPS589453B1 (en) * 1978-03-17 1983-02-21 Burroughs Corp
US4209412A (en) * 1978-05-22 1980-06-24 Hercules Incorporated Process for producing nonstoichiometric ferroso-ferric oxides
JPS5864221A (en) * 1981-10-09 1983-04-16 Ishihara Sangyo Kaisha Ltd Manufacture of ferromagnetic iron oxide coated with cobalt
DE3413752A1 (en) * 1984-04-12 1985-10-24 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING ISOTROPIC MAGNETIC, COBAL-CONTAINING IRON OXIDS
JPS6117221A (en) * 1984-06-25 1986-01-25 Konishiroku Photo Ind Co Ltd Magnetic recording medium
DE3631193A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
DE3908427A1 (en) * 1989-03-15 1990-09-20 Bayer Ag CO-CONTAINING MAGNETIC PIGMENTS, METHOD FOR THE PRODUCTION AND USE THEREOF
DE4319572A1 (en) * 1993-06-14 1994-12-15 Toda Kogyo Corp Co-containing iron oxide pigments, processes for their preparation and magnetic media containing them

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3262812A (en) * 1964-03-26 1966-07-26 Gen Electric Magnetic recording tape with magnetic layer of oxide coated iron-cobalt alloy particles in a binder
US3573980A (en) * 1968-02-19 1971-04-06 Minnesota Mining & Mfg Method of making magnetic particles and recording tape
NL7004295A (en) * 1969-05-07 1970-11-10
BE790376A (en) * 1971-10-27 1973-02-15 Ampex Cobalt doped magnetic iron oxide particles
NL180000C (en) * 1972-04-21 1986-12-16 Anvar PROCESS FOR THE PREPARATION OF A FINISHED POWDER FROM A SOLID SOLUTION OF GAMMA-FEŸ2OŸ3 SUBSTITUTED WITH ONE OR MORE TWO-VALUE METALS.

Also Published As

Publication number Publication date
DE2639250C2 (en) 1985-12-12
FR2363521A1 (en) 1978-03-31
FR2363521B1 (en) 1981-08-21
NL7709413A (en) 1978-03-03
GB1583256A (en) 1981-01-21
JPS5330497A (en) 1978-03-22
DE2639250A1 (en) 1978-03-09

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: BASF A.G.

Effective date: 19940831