GB895179A - Acicular cobalt-containing ª+-ferric oxide - Google Patents

Acicular cobalt-containing ª+-ferric oxide

Info

Publication number
GB895179A
GB895179A GB18911/60A GB1891160A GB895179A GB 895179 A GB895179 A GB 895179A GB 18911/60 A GB18911/60 A GB 18911/60A GB 1891160 A GB1891160 A GB 1891160A GB 895179 A GB895179 A GB 895179A
Authority
GB
United Kingdom
Prior art keywords
chloride
cobaltous
ferrous
sulphate
ferric oxide
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
GB18911/60A
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.)
Bayer AG
Original Assignee
Bayer 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 Bayer AG filed Critical Bayer AG
Publication of GB895179A publication Critical patent/GB895179A/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)
  • Catalysts (AREA)

Abstract

Particles of cobalt-containing g ferric oxide having lengths between 0,5 m and 3m and widths between 0,05m and 1,5m , containing 1 to 10 atom per cent of cobalt, for use in magnetogram carriers, are produced by reacting an aqueous solution of ferrous sulphate, nitrate or chloride and cobaltous sulphate, nitrate or chloride with a solution or suspension of lithium, sodium, potassium, calcium or barium hydroxide until a pH of 4,5 to 6,5 is reached, oxidizing the mixture with air, oxygen, chlorine or nitrobenzene, adding further amounts of the above-mentioned ferrous and cobaltous salts, hydroxide and oxidizing agent or a suspension of ferrous and cobaltous hydroxides with oxidizing agent, to obtain the required dimensions of the particles, and then dehydrating, reducing and oxidizing the material to obtain the g ferric oxide. In examples ferrous sulphate and chloride, cobaltous sulphate and chloride and sodium hydroxide solutions are reacted with air as oxidising agent, and the products are dehydrated by heating, reduced in hydrogen or carbon monoxide and oxidized in air.
GB18911/60A 1959-06-12 1960-05-27 Acicular cobalt-containing ª+-ferric oxide Expired GB895179A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE895179X 1959-06-12

Publications (1)

Publication Number Publication Date
GB895179A true GB895179A (en) 1962-05-02

Family

ID=6847591

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18911/60A Expired GB895179A (en) 1959-06-12 1960-05-27 Acicular cobalt-containing ª+-ferric oxide

Country Status (1)

Country Link
GB (1) GB895179A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49108599A (en) * 1973-01-12 1974-10-16
US4243443A (en) * 1978-07-17 1981-01-06 C-I-L Inc. Azide and doped iron oxide gas generating composition
EP1166291A1 (en) * 1999-03-03 2002-01-02 Paragon Medical Limited Heating of magnetic material by hysteresis effects

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49108599A (en) * 1973-01-12 1974-10-16
JPS5233319B2 (en) * 1973-01-12 1977-08-27
US4243443A (en) * 1978-07-17 1981-01-06 C-I-L Inc. Azide and doped iron oxide gas generating composition
EP1166291A1 (en) * 1999-03-03 2002-01-02 Paragon Medical Limited Heating of magnetic material by hysteresis effects
EP1166291A4 (en) * 1999-03-03 2002-09-11 Paragon Medical Ltd Heating of magnetic material by hysteresis effects
US6599234B1 (en) 1999-03-03 2003-07-29 Sirtex Medical Limited Heating of magnetic material by hysteresis effects

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