DE2559248A1 - Von lunker- bzw. blaseneinschluessen freie und gleichzeitig eine ueberlegene bestaendigkeit aufweisende nadelfoermige ferrimagnetische gamma-eisen(iii)-oxydteilchen und verfahren zur herstellung derselben - Google Patents

Von lunker- bzw. blaseneinschluessen freie und gleichzeitig eine ueberlegene bestaendigkeit aufweisende nadelfoermige ferrimagnetische gamma-eisen(iii)-oxydteilchen und verfahren zur herstellung derselben

Info

Publication number
DE2559248A1
DE2559248A1 DE19752559248 DE2559248A DE2559248A1 DE 2559248 A1 DE2559248 A1 DE 2559248A1 DE 19752559248 DE19752559248 DE 19752559248 DE 2559248 A DE2559248 A DE 2559248A DE 2559248 A1 DE2559248 A1 DE 2559248A1
Authority
DE
Germany
Prior art keywords
iron
feooh
particles
iii
reduction
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.)
Withdrawn
Application number
DE19752559248
Other languages
German (de)
English (en)
Inventor
Giuliano Fagherazzi
Francesco Dipl Chem Dr Ferrero
Giuseppe Sironi
Bruno Dipl Chem Dr Viviani
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.)
Montedison SpA
Original Assignee
Montedison SpA
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 Montedison SpA filed Critical Montedison SpA
Publication of DE2559248A1 publication Critical patent/DE2559248A1/de
Withdrawn legal-status Critical Current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
    • G11B5/70663—Preparation processes specially adapted therefor, e.g. using stabilising agents
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/06—Ferric oxide [Fe2O3]
    • 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
    • G11B5/70657—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 with a skin
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C01P2004/03—Particle morphology depicted by an image obtained by SEM
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/54—Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
    • C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
    • C01P2004/84—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases one phase coated with the other
    • C01P2004/86—Thin layer coatings, i.e. the coating thickness being less than 0.1 time the particle radius
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/42—Magnetic properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
DE19752559248 1975-01-14 1975-12-31 Von lunker- bzw. blaseneinschluessen freie und gleichzeitig eine ueberlegene bestaendigkeit aufweisende nadelfoermige ferrimagnetische gamma-eisen(iii)-oxydteilchen und verfahren zur herstellung derselben Withdrawn DE2559248A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1923875A IT1028343B (it) 1975-01-14 1975-01-14 Procedimento per la preparazione di ossido ferrico aciculare ferri magnetico

Publications (1)

Publication Number Publication Date
DE2559248A1 true DE2559248A1 (de) 1976-07-15

Family

ID=11156013

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19752559248 Withdrawn DE2559248A1 (de) 1975-01-14 1975-12-31 Von lunker- bzw. blaseneinschluessen freie und gleichzeitig eine ueberlegene bestaendigkeit aufweisende nadelfoermige ferrimagnetische gamma-eisen(iii)-oxydteilchen und verfahren zur herstellung derselben

Country Status (5)

Country Link
DE (1) DE2559248A1 (https=)
FR (1) FR2297813A1 (https=)
GB (1) GB1531051A (https=)
IT (1) IT1028343B (https=)
NL (1) NL7600190A (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2633597A1 (de) * 1976-07-27 1978-02-02 Bayer Ag Eisenoxidpigmente, insbesondere zur magnetischen aufzeichnung, sowie hydrothermalverfahren zu ihrer herstellung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2744887A1 (de) * 1977-10-06 1979-04-19 Basf Ag Verfahren zur herstellung von agglomeratfreiem gamma-eisen(iii)oxid
DE2805621A1 (de) * 1978-02-10 1979-08-23 Basf Ag Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden
JPS5677931A (en) * 1979-11-28 1981-06-26 Tdk Corp Magnetic recording medium and its producton
JPS5676510A (en) * 1979-11-28 1981-06-24 Tdk Corp Manufacture of magnetic recording material
AT382142B (de) * 1984-12-17 1987-01-12 Ruthner Michael Johann Dipl In Verfahren und vorrichtung zur herstellung von keramischen pulvern auf der basis von einund/oder mehrkomponentigen metalloxiden, sowie von deren gemischen
CA1304572C (en) * 1988-01-18 1992-07-07 Leonard George Wiseman System for coating particles employing a pneumatic transport reactor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2633597A1 (de) * 1976-07-27 1978-02-02 Bayer Ag Eisenoxidpigmente, insbesondere zur magnetischen aufzeichnung, sowie hydrothermalverfahren zu ihrer herstellung

Also Published As

Publication number Publication date
FR2297813B1 (https=) 1981-05-22
NL7600190A (nl) 1976-07-16
GB1531051A (en) 1978-11-01
FR2297813A1 (fr) 1976-08-13
IT1028343B (it) 1979-01-30

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Legal Events

Date Code Title Description
8141 Disposal/no request for examination