GB1318579A - Methods of making acicular cobalt-modified ypsilon-fe2o3 powder - Google Patents

Methods of making acicular cobalt-modified ypsilon-fe2o3 powder

Info

Publication number
GB1318579A
GB1318579A GB3545070A GB3545070A GB1318579A GB 1318579 A GB1318579 A GB 1318579A GB 3545070 A GB3545070 A GB 3545070A GB 3545070 A GB3545070 A GB 3545070A GB 1318579 A GB1318579 A GB 1318579A
Authority
GB
United Kingdom
Prior art keywords
modified
oxide
ypsilon
methods
cocl
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
GB3545070A
Other languages
English (en)
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of GB1318579A publication Critical patent/GB1318579A/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

Landscapes

  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Magnetic Record Carriers (AREA)
GB3545070A 1969-07-26 1970-07-22 Methods of making acicular cobalt-modified ypsilon-fe2o3 powder Expired GB1318579A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44059086A JPS4810994B1 (de) 1969-07-26 1969-07-26

Publications (1)

Publication Number Publication Date
GB1318579A true GB1318579A (en) 1973-05-31

Family

ID=13103164

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3545070A Expired GB1318579A (en) 1969-07-26 1970-07-22 Methods of making acicular cobalt-modified ypsilon-fe2o3 powder

Country Status (3)

Country Link
JP (1) JPS4810994B1 (de)
DE (1) DE2036612C2 (de)
GB (1) GB1318579A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2520379A1 (de) * 1974-05-06 1975-11-13 Pfizer Mit kobalt modifiziertes, nadelfoermiges gamma-ferrioxyd
FR2397049A1 (fr) * 1977-07-04 1979-02-02 Sony Corp Procede de fabrication de poudres magnetiques et poudres et supports munis de telles poudres ainsi obtenues
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
US4306921A (en) 1978-03-16 1981-12-22 Kanto Denka Kogyo Co., Ltd. Production of magnetic powder
US4384892A (en) 1978-03-16 1983-05-24 Kanto Denka Kogyo Co., Ltd. Production of magnetic powder
US4923519A (en) * 1986-09-13 1990-05-08 Bayer Aktiengesellschaft Magnetic iron oxide pigments and a process for their preparation

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5853493B2 (ja) * 1975-07-02 1983-11-29 富士写真フイルム株式会社 キヨウジセイフンマツノセイホウ
JPS608606B2 (ja) * 1975-07-02 1985-03-04 富士写真フイルム株式会社 強磁性粉末の製法
JPS5814729B2 (ja) * 1975-08-01 1983-03-22 富士写真フイルム株式会社 キヨウジセイフンマツノセイゾウホウホウ
DE2633597C2 (de) * 1976-07-27 1983-01-13 Bayer Ag, 5090 Leverkusen Verfahren zur Herstellung von nadel- bis prismenförmigen ferrimagnetischen Eisenoxidpigmenten zur magnetischen Signalaufzeichnung
DE2650890C2 (de) * 1976-11-06 1985-12-12 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadelförmigem, kobaltdotiertem, magnetischem Eisenoxid
US4276183A (en) * 1978-10-25 1981-06-30 Pfizer Inc. Cobalt modified magnetic iron oxide
JPS6011233A (ja) * 1983-06-29 1985-01-21 Fuji Photo Film Co Ltd コバルト変性強磁性酸化鉄の製法
DE3910782C2 (de) * 1988-12-24 2003-08-28 Toda Kogyo Corp Verfahren zur Herstellung von magnetischen Eisenoxiden und so erhaltene Pigmente

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278440A (en) * 1960-11-22 1966-10-11 William J Schuele Shaped fine particle ferrites and method for their preparation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2520379A1 (de) * 1974-05-06 1975-11-13 Pfizer Mit kobalt modifiziertes, nadelfoermiges gamma-ferrioxyd
FR2397049A1 (fr) * 1977-07-04 1979-02-02 Sony Corp Procede de fabrication de poudres magnetiques et poudres et supports munis de telles poudres ainsi obtenues
US4306921A (en) 1978-03-16 1981-12-22 Kanto Denka Kogyo Co., Ltd. Production of magnetic powder
US4384892A (en) 1978-03-16 1983-05-24 Kanto Denka Kogyo Co., Ltd. Production of magnetic powder
US4404024A (en) 1978-03-16 1983-09-13 Kanto Denka Kogyo Co., Ltd. Production of magnetic powder
US4447264A (en) * 1978-03-16 1984-05-08 Kanto Denka Kogyo Co., Ltd. Production of magnetic powder
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
US4923519A (en) * 1986-09-13 1990-05-08 Bayer Aktiengesellschaft Magnetic iron oxide pigments and a process for their preparation

Also Published As

Publication number Publication date
DE2036612A1 (de) 1971-02-18
JPS4810994B1 (de) 1973-04-09
DE2036612C2 (de) 1983-08-04

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Legal Events

Date Code Title Description
PS Patent sealed
48S Specification amended (sect. 8/1949)
SPA Amended specification published
PE20 Patent expired after termination of 20 years