GB1284496A - Improvements in or relating to the preparation of ferrites of lanthanides - Google Patents

Improvements in or relating to the preparation of ferrites of lanthanides

Info

Publication number
GB1284496A
GB1284496A GB1350270A GB1350270A GB1284496A GB 1284496 A GB1284496 A GB 1284496A GB 1350270 A GB1350270 A GB 1350270A GB 1350270 A GB1350270 A GB 1350270A GB 1284496 A GB1284496 A GB 1284496A
Authority
GB
United Kingdom
Prior art keywords
mixed
citrates
ferrite
compounds
lanthanide
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
GB1350270A
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.)
Compagnie Francaise de Raffinage SA
Original Assignee
Compagnie Francaise de Raffinage SA
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 Compagnie Francaise de Raffinage SA filed Critical Compagnie Francaise de Raffinage SA
Publication of GB1284496A publication Critical patent/GB1284496A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/14—Methods for preparing oxides or hydroxides in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/0018—Mixed oxides or hydroxides
    • C01G49/0054—Mixed oxides or hydroxides containing one rare earth metal, yttrium or scandium
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2675—Other ferrites containing rare earth metals, e.g. rare earth ferrite garnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/30—Three-dimensional structures
    • C01P2002/34—Three-dimensional structures perovskite-type (ABO3)

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Compounds Of Iron (AREA)

Abstract

1284496 Ferrites, aluminates and galliates of lanthanide elements COMPAGNIE FRANCAISE DE RAFFINAGE 20 March 1970 [21 March 1969] 13502/70 Heading C1A [Also in Division H1] A ferrite, or solid solution of a ferrite of a lanthanide including yttrium is prepared by subjecting mixed citrates of at least one lanthanide element and at least one other trivalent element selected from Fe, Al or Ga to pyrolysis. Ferrite is defined in the Specification as (1) compounds having the general formula LnFeO 3 crystallizing in the perovskite system and existing for all lanthanides including yttrium; (2) compounds having the general formula Ln 3 Fe 5 O 12 crystallizing in the garnet system and which exist for the series of lanthanides from Sm to Lu and also for Y; (3) compounds of class (1) or (2) in which all or part of the Fe has been substituted with Al or Ga. A solid solution of a ferrite is defined as a solid solution of the mixed oxides defined in (1), (2) or (3) above in which a lanthanide element Ln, has been partly substituted by another, Ln<SP>1</SP>, i.e. corresponding to the formulae Ln 1-x Ln<SP>1</SP> x FeO 3 or Ln 3-x Ln<SP>1</SP> x Fe 5 O 12 , as well as compounds in which the iron has been partly substituted by Al or Ga e.g. LnFe 1-x Al x O 3 or Ln 3 Fe 5-x Al x O 12 . In a particular embodiment a mixed citrate containing a single lanthanide element and one other trivalent element is employed. The pyrolysis may be carried out by bringing the temp. of the mixed citrates progressively from ambient to 600-700‹ C. The crystals so obtained may then be brought up to a temp. of 1200‹ to 1300‹ C. so as to regulate the dimensions of the crystal grain. The mixed citrates may be obtained by dissolving the single citrates in heated ammoniacal water in the proportions necessary to obtain the desired product and then evaporating the solution.
GB1350270A 1969-03-21 1970-03-20 Improvements in or relating to the preparation of ferrites of lanthanides Expired GB1284496A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6908342A FR2038681A5 (en) 1969-03-21 1969-03-21

Publications (1)

Publication Number Publication Date
GB1284496A true GB1284496A (en) 1972-08-09

Family

ID=9031076

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1350270A Expired GB1284496A (en) 1969-03-21 1970-03-20 Improvements in or relating to the preparation of ferrites of lanthanides

Country Status (5)

Country Link
BE (1) BE747696A (en)
DE (1) DE2013727A1 (en)
FR (1) FR2038681A5 (en)
GB (1) GB1284496A (en)
NL (1) NL7004043A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9758681B2 (en) 2014-07-08 2017-09-12 Seb S. A. Non-stick coating comprising at least one functional decorative layer and item provided with such a coating

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3721767A1 (en) * 1987-07-01 1989-01-12 Bayer Ag METHOD FOR THE PRODUCTION OF FINE-PARTICLE BARIUM HEXAFERRITE PIGMENTS FROM HALOGENID MELTS AND THE USE OF THIS PRODUCED BARIUM HEXAFERRITE PIGMENTS
IT1230836B (en) * 1989-03-01 1991-11-07 Selenia Ind Elettroniche PROCESS FOR THE MANUFACTURE OF CERAMIC MAGNETIC MATERIALS FOR MICROWAVE APPLICATION
CN115385401B (en) * 2022-08-24 2023-09-29 中国环境科学研究院 Porous three-dimensional reticular structure lanthanum iron nickel perovskite material, preparation method and application thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9758681B2 (en) 2014-07-08 2017-09-12 Seb S. A. Non-stick coating comprising at least one functional decorative layer and item provided with such a coating

Also Published As

Publication number Publication date
BE747696A (en) 1970-09-21
FR2038681A5 (en) 1971-01-08
DE2013727A1 (en) 1970-10-15
NL7004043A (en) 1970-09-23

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Legal Events

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