GB1284496A - Improvements in or relating to the preparation of ferrites of lanthanides - Google Patents
Improvements in or relating to the preparation of ferrites of lanthanidesInfo
- 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
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.
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)
| 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)
| 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 |
-
1969
- 1969-03-21 FR FR6908342A patent/FR2038681A5/fr not_active Expired
-
1970
- 1970-03-20 GB GB1350270A patent/GB1284496A/en not_active Expired
- 1970-03-20 NL NL7004043A patent/NL7004043A/xx unknown
- 1970-03-20 BE BE747696D patent/BE747696A/en unknown
- 1970-03-21 DE DE19702013727 patent/DE2013727A1/en active Pending
Cited By (1)
| 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 |
|---|---|
| NL7004043A (en) | 1970-09-23 |
| BE747696A (en) | 1970-09-21 |
| DE2013727A1 (en) | 1970-10-15 |
| FR2038681A5 (en) | 1971-01-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |