GB721630A - Method for the production of ª†-fe o of improved magnetic properties - Google Patents

Method for the production of ª†-fe o of improved magnetic properties

Info

Publication number
GB721630A
GB721630A GB21795/52A GB2179552A GB721630A GB 721630 A GB721630 A GB 721630A GB 21795/52 A GB21795/52 A GB 21795/52A GB 2179552 A GB2179552 A GB 2179552A GB 721630 A GB721630 A GB 721630A
Authority
GB
United Kingdom
Prior art keywords
production
cobaltous
ferric oxide
magnetic properties
improved magnetic
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
GB21795/52A
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.)
ANORGANA GmbH
Original Assignee
ANORGANA GmbH
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 ANORGANA GmbH filed Critical ANORGANA GmbH
Publication of GB721630A publication Critical patent/GB721630A/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

  • Paints Or Removers (AREA)

Abstract

For the production of g -ferric oxide, a ferrous salt solution containing an oxidizing agent and a cobaltous salt, e.g. the sulphate, insufficient for the formation of cobaltous ferrite and not exceeding 10 per cent by weight of the said salts present is treated with an alkali agent, e.g. caustic soda, and the resulting suspension is boiled to form triferric tetroxide which is then oxidized in air at 200 DEG -300 DEG C. The cobalt-containing ferric oxide so formed may be mixed with a binder, e.g. poly-vinyl chloride, for the production of magnetic recording tapes.
GB21795/52A 1951-08-29 1952-08-29 Method for the production of ª†-fe o of improved magnetic properties Expired GB721630A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE721630X 1951-08-29

Publications (1)

Publication Number Publication Date
GB721630A true GB721630A (en) 1955-01-12

Family

ID=6630002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21795/52A Expired GB721630A (en) 1951-08-29 1952-08-29 Method for the production of ª†-fe o of improved magnetic properties

Country Status (1)

Country Link
GB (1) GB721630A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941901A (en) * 1955-07-08 1960-06-21 Agfa Ag Magnetic impulse record carriers
US2978414A (en) * 1951-04-09 1961-04-04 Agfa Ag Magnetic impulse record carrier
US2994045A (en) * 1955-04-11 1961-07-25 Bell Telephone Labor Inc Electrical transmission devices utilizing gyromagnetic ferrites
US3031341A (en) * 1958-01-23 1962-04-24 Ibm High density magnetic recording tape
US3047429A (en) * 1959-03-27 1962-07-31 Rca Corp Magnetic recording medium comprising coatings of ferrite particles of the molar composite amno.bzno.cfe2o3
US3081264A (en) * 1958-04-09 1963-03-12 Matake Kurokawa Method of preparing a magnetic recorder powder
US3082067A (en) * 1959-04-28 1963-03-19 Bayer Ag Process for the production of isometric ferromagnetic gamma-ferric oxide
US3084123A (en) * 1959-01-27 1963-04-02 Bayer Ag Process for producing ferrites
US3117933A (en) * 1959-06-12 1964-01-14 Bayer Ag Process for the production of needleshaped, cobalt-containing gamma-ferric oxide crystalline particles
DE1162340B (en) * 1957-05-24 1964-02-06 Henricot Usines Emile Sa Process for the production of magnetic iron oxide for magnetic recording devices
DE1198270B (en) * 1955-05-03 1965-08-05 Lignes Telegraph Telephon Process for the production of ferromagnetic ferrite cores with a largely rectangular hysteresis loop and very short switching time
DE1226997B (en) * 1959-06-12 1966-10-20 Bayer Ag Process for the production of acicular, cobalt-containing gamma iron (III) oxide
DE2022013A1 (en) * 1969-05-07 1970-11-19 Ampex Process for the production of a needle-shaped, cobalt-doped gamma iron oxide
US4414245A (en) 1981-07-28 1983-11-08 Ishihara Sangyo Kaisha, Ltd. Process for producing cobalt containing ferromagnetic iron oxides

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978414A (en) * 1951-04-09 1961-04-04 Agfa Ag Magnetic impulse record carrier
US2994045A (en) * 1955-04-11 1961-07-25 Bell Telephone Labor Inc Electrical transmission devices utilizing gyromagnetic ferrites
DE1198270B (en) * 1955-05-03 1965-08-05 Lignes Telegraph Telephon Process for the production of ferromagnetic ferrite cores with a largely rectangular hysteresis loop and very short switching time
US2941901A (en) * 1955-07-08 1960-06-21 Agfa Ag Magnetic impulse record carriers
DE1162340B (en) * 1957-05-24 1964-02-06 Henricot Usines Emile Sa Process for the production of magnetic iron oxide for magnetic recording devices
US3031341A (en) * 1958-01-23 1962-04-24 Ibm High density magnetic recording tape
US3081264A (en) * 1958-04-09 1963-03-12 Matake Kurokawa Method of preparing a magnetic recorder powder
US3084123A (en) * 1959-01-27 1963-04-02 Bayer Ag Process for producing ferrites
US3047429A (en) * 1959-03-27 1962-07-31 Rca Corp Magnetic recording medium comprising coatings of ferrite particles of the molar composite amno.bzno.cfe2o3
US3082067A (en) * 1959-04-28 1963-03-19 Bayer Ag Process for the production of isometric ferromagnetic gamma-ferric oxide
US3117933A (en) * 1959-06-12 1964-01-14 Bayer Ag Process for the production of needleshaped, cobalt-containing gamma-ferric oxide crystalline particles
DE1226997B (en) * 1959-06-12 1966-10-20 Bayer Ag Process for the production of acicular, cobalt-containing gamma iron (III) oxide
DE2022013A1 (en) * 1969-05-07 1970-11-19 Ampex Process for the production of a needle-shaped, cobalt-doped gamma iron oxide
US4414245A (en) 1981-07-28 1983-11-08 Ishihara Sangyo Kaisha, Ltd. Process for producing cobalt containing ferromagnetic iron oxides

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