GB1293817A - A process for the production of ferromagnetic chromium dioxide - Google Patents

A process for the production of ferromagnetic chromium dioxide

Info

Publication number
GB1293817A
GB1293817A GB5213170A GB5213170A GB1293817A GB 1293817 A GB1293817 A GB 1293817A GB 5213170 A GB5213170 A GB 5213170A GB 5213170 A GB5213170 A GB 5213170A GB 1293817 A GB1293817 A GB 1293817A
Authority
GB
United Kingdom
Prior art keywords
melt
added
compounds
dioxide
chromium dioxide
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
GB5213170A
Inventor
Henning Erfurth
Hans Zirngibl
Manfred Mansmann
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 GB1293817A publication Critical patent/GB1293817A/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
    • G11B5/70636—CrO2

Landscapes

  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)

Abstract

1293817 Chromium dioxide FARBENFABRIKEN BAYER AG 3 Nov 1970 [6 Nov 1969] 52131/70 Heading C1A Ferromagnetic chromium D dioxide, having a rutile structure, is prepared by allowing a proton donor to act upon a melt of at least one dichromate in the presence of at least one compound of the elements F, Mg, Zn, Sn, Ti, Sb, V, Nb, Ta, Te, Mn, Fe, Co, Ni, Ru and Pd and at a temperature of from 250‹ to 500‹ C. Proton donors are defined as compounds which yield protons in the presence of water (e.g. acids, acid halides or acid anhydrides). The reaction may be carried out at pressures up to 50 atmospheres. At least one inorganic salt e.g. nitrate of an alkali metal and/or an alkaline earth metal may be added to the melt. Compounds of the elements listed above may be added in a quantity of from 0À01% to 10% by weight based on the dichromate melt. Antimony oxide and tellurium oxide were added as modifying compounds in the examples. In one example chromium dioxide in the form of needles 0À8Á long and 0À034Á wide is obtained.
GB5213170A 1969-11-06 1970-11-03 A process for the production of ferromagnetic chromium dioxide Expired GB1293817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691955896 DE1955896A1 (en) 1969-11-06 1969-11-06 Process for the production of ferromagnetic chromium dioxide

Publications (1)

Publication Number Publication Date
GB1293817A true GB1293817A (en) 1972-10-25

Family

ID=5750333

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5213170A Expired GB1293817A (en) 1969-11-06 1970-11-03 A process for the production of ferromagnetic chromium dioxide

Country Status (5)

Country Link
BE (1) BE758610A (en)
DE (1) DE1955896A1 (en)
FR (1) FR2100595A1 (en)
GB (1) GB1293817A (en)
NL (1) NL7016306A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956152A (en) * 1972-10-23 1976-05-11 Hitachi, Ltd. Magnetic recording media

Also Published As

Publication number Publication date
BE758610A (en) 1971-05-06
DE1955896A1 (en) 1971-05-13
FR2100595A1 (en) 1972-03-24
NL7016306A (en) 1971-05-10

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees