GB1432643A - Manufacture of cobalt-modified ypsilon-iron-iii-oxides - Google Patents

Manufacture of cobalt-modified ypsilon-iron-iii-oxides

Info

Publication number
GB1432643A
GB1432643A GB4107273A GB4107273A GB1432643A GB 1432643 A GB1432643 A GB 1432643A GB 4107273 A GB4107273 A GB 4107273A GB 4107273 A GB4107273 A GB 4107273A GB 1432643 A GB1432643 A GB 1432643A
Authority
GB
United Kingdom
Prior art keywords
cobalt
iron
oxide
iii
magnetite
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB4107273A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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 SE filed Critical BASF SE
Publication of GB1432643A publication Critical patent/GB1432643A/en
Expired legal-status Critical Current

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
    • 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
    • G11B5/70663—Preparation processes specially adapted therefor, e.g. using stabilising agents

Landscapes

  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)

Abstract

1432643 Cobalt-modified iron (III) oxide BASF AG 31 Aug 1973 [1 Sept 1972] 41072/73 Heading C1A Cobalt-modified γ-iron (III) oxide is made by (1) providing acicular iron oxide (e.g. α-Fe 2 O 3 ) or oxide hydrate (e.g. α-FeOOH) with a sinterpreventing coating; (2) reducing the coated needles to magnetite (Fe 3 O 4 ) at 350-650‹ C.; and then either (a) oxidizing the magnetite to γ-Fe 2 O 3 , applying a cobalt compound thereto, and then heating the cobalt-treated γ-Fe 2 O 3 to 80-300‹ C., or (b) applying a cobalt compound to the magnetite, and then heating the cobalttreated magnetite to 80-300‹ C., with oxidation to γ-Fe 2 O 3 . The coating on the acicular starting material may be formed by treating, it with oxyacids of phosphorus and/or boron or their salts, or by depositing oxides or hydroxides of Al, Zr, Si, or Cr from salt solutions. The cobalt content of the product may be 0À25-15 wt. per cent based on wt. of iron oxide. The cobalt content may be derived by impregnating the iron oxide with cobalt sulphate. Examples describe the preparation of γ-iron (III) containing 15 wt. per cent cobalt, and its magnetic properties. A magnetic recording tape incorporating the oxide is also described.
GB4107273A 1972-09-01 1973-08-31 Manufacture of cobalt-modified ypsilon-iron-iii-oxides Expired GB1432643A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722243231 DE2243231C2 (en) 1972-09-01 1972-09-01 Process for the preparation of cobalt-doped γ-iron (III) oxide

Publications (1)

Publication Number Publication Date
GB1432643A true GB1432643A (en) 1976-04-22

Family

ID=5855337

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4107273A Expired GB1432643A (en) 1972-09-01 1973-08-31 Manufacture of cobalt-modified ypsilon-iron-iii-oxides

Country Status (4)

Country Link
JP (1) JPS5737532B2 (en)
DE (1) DE2243231C2 (en)
FR (1) FR2197818B3 (en)
GB (1) GB1432643A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287233A (en) 1979-02-13 1981-09-01 Basf Aktiengesellschaft Manufacture of acicular cobalt-containing magnetic iron oxide
US4296149A (en) 1979-02-13 1981-10-20 Basf Aktiengesellschaft Manufacture of acicular cobalt-containing magnetic iron oxide
US4501774A (en) * 1981-10-12 1985-02-26 Ishihara Sangyo Kaisha, Ltd. Process for the production of cobalt-containing magnetic iron oxide powder
EP0158240A2 (en) * 1984-04-12 1985-10-16 BASF Aktiengesellschaft Process for preparing isotrope magnetic cobalt containing iron oxides
US4631140A (en) * 1984-10-18 1986-12-23 Basf Aktiengesellschaft Ferrimagnetic particles and their preparation

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719049B2 (en) * 1974-06-13 1982-04-20
DE2625106C2 (en) * 1976-06-04 1982-03-11 Bayer Ag, 5090 Leverkusen Iron oxide black pigments with improved oxidation resistance and process for their preparation
DE2705967C2 (en) * 1977-02-12 1990-01-04 Basf Ag, 6700 Ludwigshafen Process for the production of acicular cobalt-containing magnetic iron oxide
JPS5413997A (en) * 1977-07-04 1979-02-01 Sony Corp Magnetic recording medium and its manufacture
DE2743298A1 (en) * 1977-09-27 1979-04-05 Basf Ag FERROMAGNETIC METAL PARTS CONSISTING MAINLY OF IRON AND THE PROCESS FOR THEIR PRODUCTION
DE2815712A1 (en) * 1978-04-12 1979-10-25 Bayer Ag IRON OXIDES FOR MAGNETIC SIGNAL RECORDING AND PROCESS FOR THEIR PRODUCTION
US4276183A (en) * 1978-10-25 1981-06-30 Pfizer Inc. Cobalt modified magnetic iron oxide
DE2903593C3 (en) * 1979-01-31 1982-05-06 Bayer Ag, 5090 Leverkusen Cobalt-doped ferrimagnetic iron oxides and processes for their production
JPS55149137A (en) * 1979-05-11 1980-11-20 Tdk Corp High performance high coercive force powder and its manufacture
JPS5626729A (en) * 1979-08-11 1981-03-14 Tdk Corp Powdered magnetic material for magnetic recording medium
JPS5819733A (en) * 1981-07-28 1983-02-04 Toshiba Corp Magnetic recording medium and its manufacture
AU555302B2 (en) * 1981-12-25 1986-09-18 Ishihara Sangyo Kaisha Ltd. Cobalt containing iron oxide powder
JPS59107924A (en) * 1982-12-08 1984-06-22 Ishihara Sangyo Kaisha Ltd Manufacture of magnetic iron oxide powder containing cobalt
JPS6187302A (en) * 1985-10-18 1986-05-02 Sony Corp Manufacture of magnetic recording medium
DE3631193A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
DE3910782C2 (en) * 1988-12-24 2003-08-28 Toda Kogyo Corp Process for the production of magnetic iron oxides and pigments thus obtained

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1592214C3 (en) * 1967-11-25 1979-10-18 Agfa-Gevaert Ag, 5090 Leverkusen Process for the production of magnetic γ -Fe2 O3 by converting a -FeOOH particles
NL7004295A (en) * 1969-05-07 1970-11-10

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287233A (en) 1979-02-13 1981-09-01 Basf Aktiengesellschaft Manufacture of acicular cobalt-containing magnetic iron oxide
US4296149A (en) 1979-02-13 1981-10-20 Basf Aktiengesellschaft Manufacture of acicular cobalt-containing magnetic iron oxide
US4501774A (en) * 1981-10-12 1985-02-26 Ishihara Sangyo Kaisha, Ltd. Process for the production of cobalt-containing magnetic iron oxide powder
EP0158240A2 (en) * 1984-04-12 1985-10-16 BASF Aktiengesellschaft Process for preparing isotrope magnetic cobalt containing iron oxides
EP0158240A3 (en) * 1984-04-12 1988-07-06 BASF Aktiengesellschaft Process for preparing isotrope magnetic cobalt containing iron oxides
US4631140A (en) * 1984-10-18 1986-12-23 Basf Aktiengesellschaft Ferrimagnetic particles and their preparation

Also Published As

Publication number Publication date
DE2243231C2 (en) 1982-01-28
FR2197818B3 (en) 1976-08-06
JPS4969588A (en) 1974-07-05
DE2243231A1 (en) 1974-03-21
JPS5737532B2 (en) 1982-08-10
FR2197818A1 (en) 1974-03-29

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee