DE2805621A1 - Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden - Google Patents

Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden

Info

Publication number
DE2805621A1
DE2805621A1 DE19782805621 DE2805621A DE2805621A1 DE 2805621 A1 DE2805621 A1 DE 2805621A1 DE 19782805621 DE19782805621 DE 19782805621 DE 2805621 A DE2805621 A DE 2805621A DE 2805621 A1 DE2805621 A1 DE 2805621A1
Authority
DE
Germany
Prior art keywords
iron
iii
lepidocrocite
acicular
iron 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.)
Withdrawn
Application number
DE19782805621
Other languages
German (de)
English (en)
Inventor
Horst Dipl Chem Dr Autzen
Helmut Dipl Phys Dr Jakusch
Eberhard Dipl Phys Dr Koester
Werner Dipl Ing Dr Loeser
Peter Dipl Chem Dr Rudolf
Wilhelm Dipl Chem Dr Sarnecki
Werner Dipl Chem Dr Steck
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to DE19782805621 priority Critical patent/DE2805621A1/de
Priority to US06/006,528 priority patent/US4221776A/en
Priority to NL7900946A priority patent/NL7900946A/xx
Priority to FR7903382A priority patent/FR2416869A1/fr
Publication of DE2805621A1 publication Critical patent/DE2805621A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G11B5/70647—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 with a skin
    • 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
    • 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
    • G11B5/70678—Ferrites
    • G11B5/70684—Ferro-ferrioxydes
    • 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
    • G11B5/70678—Ferrites
    • G11B5/70684—Ferro-ferrioxydes
    • G11B5/70694—Non-stoechiometric ferro-ferrioxydes, e.g. berthollide
    • 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
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • 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)
  • Health & Medical Sciences (AREA)
  • Dermatology (AREA)
  • General Health & Medical Sciences (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Magnetic Record Carriers (AREA)
DE19782805621 1978-02-10 1978-02-10 Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden Withdrawn DE2805621A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19782805621 DE2805621A1 (de) 1978-02-10 1978-02-10 Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden
US06/006,528 US4221776A (en) 1978-02-10 1979-01-25 Manufacture of acicular ferrimagnetic iron oxides
NL7900946A NL7900946A (nl) 1978-02-10 1979-02-06 Werkwijze voor de bereiding van naaldvormige ferrimag- netische ijzeroxiden.
FR7903382A FR2416869A1 (fr) 1978-02-10 1979-02-09 Procede de preparation d'oxydes de fer ferrimagnetiques aciculaires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782805621 DE2805621A1 (de) 1978-02-10 1978-02-10 Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden

Publications (1)

Publication Number Publication Date
DE2805621A1 true DE2805621A1 (de) 1979-08-23

Family

ID=6031612

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782805621 Withdrawn DE2805621A1 (de) 1978-02-10 1978-02-10 Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden

Country Status (4)

Country Link
US (1) US4221776A (en, 2012)
DE (1) DE2805621A1 (en, 2012)
FR (1) FR2416869A1 (en, 2012)
NL (1) NL7900946A (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087578A1 (de) * 1982-02-10 1983-09-07 BASF Aktiengesellschaft Nadelförmiges ferrimagnetisches Eisenoxid und Verfahren zu seiner Herstellung
EP0256459A3 (de) * 1986-08-09 1989-12-13 BASF Aktiengesellschaft Verfahren zur Herstellung von nadelförmigem, ferrimagnetischem Eisenoxid

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3019764A1 (de) * 1980-05-23 1981-12-03 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung von synthetischem lepidokrokit
DE3044340A1 (de) * 1980-11-25 1982-06-24 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung von hochkoerzitivem nadelfoermigem gamma-eisen(iii)oxid
JPS5986684A (ja) * 1982-11-08 1984-05-18 Fuji Photo Film Co Ltd 蛍光体の製造法
DE3432224A1 (de) * 1984-09-01 1986-03-13 Bayer Ag, 5090 Leverkusen Hoeherkoerzitive isometrische eisenoxide, verfahren zu ihrer herstellung sowie deren verwendung
JPS62167221A (ja) * 1986-01-17 1987-07-23 Showa Denko Kk レピッドクロサイトの製造方法
JPS62167222A (ja) * 1986-01-17 1987-07-23 Showa Denko Kk レピツドクロサイトの製造方法
US5069216A (en) * 1986-07-03 1991-12-03 Advanced Magnetics Inc. Silanized biodegradable super paramagnetic metal oxides as contrast agents for imaging the gastrointestinal tract
US5219554A (en) 1986-07-03 1993-06-15 Advanced Magnetics, Inc. Hydrated biodegradable superparamagnetic metal oxides

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2805405A1 (de) * 1978-02-09 1979-08-16 Basf Ag Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB675260A (en) 1948-02-16 1952-07-09 Minnesota Mining & Mfg Improvements in or relating to method of making magnetic material, the magnetic material resulting from said method, and a magnetic record tape or sheet employing said magnetic material
US2900236A (en) * 1955-08-03 1959-08-18 Audio Devices Inc Production of ferromagnetic iron oxide
DE1061760B (de) * 1957-05-28 1959-07-23 Bayer Ag Verfahren zur Herstellung von ferromagnetischem gamma-Fe O
GB1385777A (en) * 1971-05-06 1975-02-26 Bayer Ag Magnetic iron oxides and a process for their production
US3904540A (en) * 1972-02-11 1975-09-09 Pfizer Magnetic impulse record member
US3897354A (en) * 1972-04-29 1975-07-29 Bayer Ag Cobalt-containing acicular ferrimagnetic iron oxide of improved remanence stability
IT1028343B (it) * 1975-01-14 1979-01-30 Montedison Spa Procedimento per la preparazione di ossido ferrico aciculare ferri magnetico
DE2550307C3 (de) * 1975-11-08 1978-07-06 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadeiförmigem Y-Eisen(ni)-Oxid
DE2735316C3 (de) * 1977-08-05 1981-01-29 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadeiförmigen, ferrimagnetischen Eisenoxiden

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2805405A1 (de) * 1978-02-09 1979-08-16 Basf Ag Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087578A1 (de) * 1982-02-10 1983-09-07 BASF Aktiengesellschaft Nadelförmiges ferrimagnetisches Eisenoxid und Verfahren zu seiner Herstellung
EP0256459A3 (de) * 1986-08-09 1989-12-13 BASF Aktiengesellschaft Verfahren zur Herstellung von nadelförmigem, ferrimagnetischem Eisenoxid

Also Published As

Publication number Publication date
FR2416869B1 (en, 2012) 1984-03-16
FR2416869A1 (fr) 1979-09-07
NL7900946A (nl) 1979-08-14
US4221776A (en) 1980-09-09

Similar Documents

Publication Publication Date Title
EP0018009B1 (de) Modifitiertes nadelförmiges magnetisches Eisenoxid und Verfahren zu seiner Herstellung sowie dessen Verwendung zur Herstellung von magnetischen Aufzeichnungsträgern
EP0000749B1 (de) Verfahren zur Herstellung von nadelförmigen, ferrimagnetischen Eisenoxiden und deren Verwendung
EP0014902B1 (de) Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid
EP0014903B1 (de) Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid
DE2705967C2 (de) Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid
DE2805621A1 (de) Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden
DE2805405C2 (en, 2012)
EP0024693A2 (de) Verfahren zur Herstellung von nadelförmigem ferrimagnetischem Eisenoxid und seine Verwendung
DE2639250C2 (de) Verfahren zur Herstellung von nadelförmigem, kobaltdotiertem magnetischem Eisenoxid
DE2428875C2 (de) Verfahren zur Herstellung von γ-Eisen(III)oxid
DE3235425C2 (de) Magnetisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung
EP0105110A2 (de) Verfahren zur Herstellung nadelförmiger, im wesentlichen aus Eisen bestehender ferromagnetischer Metallteilchen
DE3224325A1 (de) Verfahren zur herstellung von nadelfoermigen, ferrimagnetischen eisenoxiden
DE2520379C3 (de) Verfahren zur Herstellung von nadelförmigem γ -Ferrioxid und Verwendung desselben zur Herstellung eines magnetischen Aufzeichungsmaterials
DE69404579T2 (de) Nadelförmige feinpartikel mit oberflächenbeschichtung, methode zu ihrer herstellung und verwendung derselben
EP0160877B1 (de) Verfahren zur Herstellung von feinteiligem isotropem kobalthaltigem Ferritpulver
DE2749757C2 (en, 2012)
DE3325613A1 (de) Verfahren zur herstellung von kobalt und zweiwertiges eisen enthaltendem, ferromagnetischem eisenoxid
DE2144553C2 (de) Kristallines γ-Eisen (III)oxid, Verfahren zu dessen Herstellung sowie Verwendung desselben
EP0158240A2 (de) Verfahren zur Herstellung isotroper magnetischer, kobalthaltiger Eisenoxide
EP0047368B1 (de) Nadelförmiges magnetisches Eisenoxid und Verfahren zu seiner Herstellung
DE69406499T2 (de) Kobalt enthaltende Eisenoxidpigmente, Erzeugungsverfahren und diese enthaltendes magnetisches Aufzeichnungsmedium
EP0110115A1 (de) Nadelförmige ferromagnetische Chromdioxidteilchen
DE2735315A1 (de) Verfahren zur herstellung von nadelfoermigem gamma-eisen(iii)oxid
EP0256459A2 (de) Verfahren zur Herstellung von nadelförmigem, ferrimagnetischem Eisenoxid

Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8130 Withdrawal