BE858222A - Oxyde de fer magnetique aciculaire, dope au colbalt, et procede de preparation de cet oxyde - Google Patents

Oxyde de fer magnetique aciculaire, dope au colbalt, et procede de preparation de cet oxyde

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
English (en)
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/xx

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 Oxyde de fer magnetique aciculaire, dope au colbalt, et procede de preparation de cet oxyde BE858222A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762639250 DE2639250C2 (de) 1976-09-01 1976-09-01 Verfahren zur Herstellung von nadelförmigem, kobaltdotiertem magnetischem Eisenoxid

Publications (1)

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

Family

ID=5986842

Family Applications (1)

Application Number Title Priority Date Filing Date
BE180522A BE858222A (fr) 1976-09-01 1977-08-30 Oxyde de fer magnetique aciculaire, dope au colbalt, et procede de preparation de cet oxyde

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 (ja) * 1981-10-09 1983-04-16 Ishihara Sangyo Kaisha Ltd コバルト被着強磁性酸化鉄の製造方法
DE3413752A1 (de) * 1984-04-12 1985-10-24 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung isotroper magnetischer, kobalthaltiger eisenoxide
JPS6117221A (ja) * 1984-06-25 1986-01-25 Konishiroku Photo Ind Co Ltd 磁気記録媒体
DE3631193A1 (de) * 1986-09-13 1988-03-24 Bayer Ag Magnetische eisenoxidpigmente und verfahren zu ihrer herstellung
DE3908427A1 (de) * 1989-03-15 1990-09-20 Bayer Ag Co-haltige magnetische pigmente, verfahren zu ihrer herstellung sowie deren verwendung
DE4319572A1 (de) * 1993-06-14 1994-12-15 Toda Kogyo Corp Co-haltige Eisenoxidpigmente, Verfahren zu ihrer Herstellung und diese enthaltende magnetische Medien

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
GB1268458A (en) * 1969-05-07 1972-03-29 Ampex Improvements in and relating to the preparation of cobalt doped gamma ferric oxide
BE790376A (fr) * 1971-10-27 1973-02-15 Ampex Particules d'oxyde de fer magnétique dopé au cobalt
NL180000C (nl) * 1972-04-21 1986-12-16 Anvar Werkwijze voor de bereiding van een fijnverdeeld poeder uit een vaste oplossing van met een of meer tweewaardige metalen gesubstitueerd gamma-feÿ2oÿ3.

Also Published As

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

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: BASF A.G.

Effective date: 19940831