GB717269A - Magnetizable metal oxides - Google Patents

Magnetizable metal oxides

Info

Publication number
GB717269A
GB717269A GB8549/52A GB854952A GB717269A GB 717269 A GB717269 A GB 717269A GB 8549/52 A GB8549/52 A GB 8549/52A GB 854952 A GB854952 A GB 854952A GB 717269 A GB717269 A GB 717269A
Authority
GB
United Kingdom
Prior art keywords
product
per cent
nitrate
precipitating
metal oxides
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
GB8549/52A
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.)
AZFA AG fur PHOTOFABRIKATION
Original Assignee
AZFA AG fur PHOTOFABRIKATION
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 AZFA AG fur PHOTOFABRIKATION filed Critical AZFA AG fur PHOTOFABRIKATION
Publication of GB717269A publication Critical patent/GB717269A/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

Landscapes

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

Abstract

Aqueous solutions or iron and cobalt compounds containing, when trivalent ions are present, at most 25 per cent. of the metal ions in trivalent form and the rest in divalent form are prepared; hydroxides or carbonates of the said metals are precipitated simultaneously, successively in the same reaction vessel or separately with subsequent mixing, treated whilst wet with oxidizing agents and the product dried to form a magnetizable oxide in powder form. Preferred features include the use of a few, e.g. 2-7 mols per cent. of the cobalt compound; precipitating by means of caustic alkali or water-soluble carbonate; heating the dried product in the presence of oxidizing gases to below about 500 DEG C. In the examples, ammonia and sodium hydroxide are used as precipitating agents; oxidation is performed by means of caustic soda/sodium nitrate, potassium nitrate and ammonium nitrate; in one case the product is heated at 280 DEG C, for 6 hours. The remanence and coercity of the products are indicated. The composition of the metal oxides is said to correspond generally with that of the ferrites.
GB8549/52A 1951-04-09 1952-04-03 Magnetizable metal oxides Expired GB717269A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE717269X 1951-04-09

Publications (1)

Publication Number Publication Date
GB717269A true GB717269A (en) 1954-10-27

Family

ID=6626661

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8549/52A Expired GB717269A (en) 1951-04-09 1952-04-03 Magnetizable metal oxides

Country Status (1)

Country Link
GB (1) GB717269A (en)

Cited By (12)

* 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
US3015788A (en) * 1956-04-13 1962-01-02 Raytheon Co Microwave device
US3031341A (en) * 1958-01-23 1962-04-24 Ibm High density magnetic recording tape
US3046158A (en) * 1958-12-31 1962-07-24 Fuji Photo Film Co Ltd Process for producing magnetic material
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
US3117933A (en) * 1959-06-12 1964-01-14 Bayer Ag Process for the production of needleshaped, cobalt-containing gamma-ferric oxide crystalline particles
US3528919A (en) * 1965-04-01 1970-09-15 Canadian Patents Dev Electronic ceramic compositions
US4451535A (en) * 1980-07-16 1984-05-29 Eastman Kodak Company Magnetic recording elements, process for making the same and their use in recording
WO2002002574A1 (en) * 2000-06-29 2002-01-10 The Board Of Trustees Of The University Of Illinois Organometallic compounds and their use as precursors for forming films and powders of metal or metal derivatives

Cited By (15)

* 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
US2941901A (en) * 1955-07-08 1960-06-21 Agfa Ag Magnetic impulse record carriers
US3015788A (en) * 1956-04-13 1962-01-02 Raytheon Co Microwave device
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
US3046158A (en) * 1958-12-31 1962-07-24 Fuji Photo Film Co Ltd Process for producing magnetic material
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
US3528919A (en) * 1965-04-01 1970-09-15 Canadian Patents Dev Electronic ceramic compositions
US4451535A (en) * 1980-07-16 1984-05-29 Eastman Kodak Company Magnetic recording elements, process for making the same and their use in recording
WO2002002574A1 (en) * 2000-06-29 2002-01-10 The Board Of Trustees Of The University Of Illinois Organometallic compounds and their use as precursors for forming films and powders of metal or metal derivatives
US6753245B2 (en) 2000-06-29 2004-06-22 Board Of Trustees, The University Of Illinois Organometallic compounds and their use as precursors for forming films and powders of metal or metal derivatives
US6777565B2 (en) 2000-06-29 2004-08-17 Board Of Trustees, The University Of Illinois Organometallic compounds and their use as precursors for forming films and powders of metal or metal derivatives
US7507390B2 (en) 2000-06-29 2009-03-24 Board Of Trustees, The University Of Illinois Organometallic compounds and their use as precursors for forming films and powders of metal or metal derivatives

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