GB895179A - Acicular cobalt-containing ª+-ferric oxide - Google Patents
Acicular cobalt-containing ª+-ferric oxideInfo
- Publication number
- GB895179A GB895179A GB18911/60A GB1891160A GB895179A GB 895179 A GB895179 A GB 895179A GB 18911/60 A GB18911/60 A GB 18911/60A GB 1891160 A GB1891160 A GB 1891160A GB 895179 A GB895179 A GB 895179A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chloride
- cobaltous
- ferrous
- sulphate
- ferric oxide
- 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
-
- 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
- G11B5/70668—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 containing a dopant
- G11B5/70673—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 containing a dopant containing Co
Landscapes
- Hard Magnetic Materials (AREA)
- Catalysts (AREA)
Abstract
Particles of cobalt-containing g ferric oxide having lengths between 0,5 m and 3m and widths between 0,05m and 1,5m , containing 1 to 10 atom per cent of cobalt, for use in magnetogram carriers, are produced by reacting an aqueous solution of ferrous sulphate, nitrate or chloride and cobaltous sulphate, nitrate or chloride with a solution or suspension of lithium, sodium, potassium, calcium or barium hydroxide until a pH of 4,5 to 6,5 is reached, oxidizing the mixture with air, oxygen, chlorine or nitrobenzene, adding further amounts of the above-mentioned ferrous and cobaltous salts, hydroxide and oxidizing agent or a suspension of ferrous and cobaltous hydroxides with oxidizing agent, to obtain the required dimensions of the particles, and then dehydrating, reducing and oxidizing the material to obtain the g ferric oxide. In examples ferrous sulphate and chloride, cobaltous sulphate and chloride and sodium hydroxide solutions are reacted with air as oxidising agent, and the products are dehydrated by heating, reduced in hydrogen or carbon monoxide and oxidized in air.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE895179X | 1959-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB895179A true GB895179A (en) | 1962-05-02 |
Family
ID=6847591
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18911/60A Expired GB895179A (en) | 1959-06-12 | 1960-05-27 | Acicular cobalt-containing ª+-ferric oxide |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB895179A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49108599A (en) * | 1973-01-12 | 1974-10-16 | ||
US4243443A (en) * | 1978-07-17 | 1981-01-06 | C-I-L Inc. | Azide and doped iron oxide gas generating composition |
EP1166291A1 (en) * | 1999-03-03 | 2002-01-02 | Paragon Medical Limited | Heating of magnetic material by hysteresis effects |
-
1960
- 1960-05-27 GB GB18911/60A patent/GB895179A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49108599A (en) * | 1973-01-12 | 1974-10-16 | ||
JPS5233319B2 (en) * | 1973-01-12 | 1977-08-27 | ||
US4243443A (en) * | 1978-07-17 | 1981-01-06 | C-I-L Inc. | Azide and doped iron oxide gas generating composition |
EP1166291A1 (en) * | 1999-03-03 | 2002-01-02 | Paragon Medical Limited | Heating of magnetic material by hysteresis effects |
EP1166291A4 (en) * | 1999-03-03 | 2002-09-11 | Paragon Medical Ltd | Heating of magnetic material by hysteresis effects |
US6599234B1 (en) | 1999-03-03 | 2003-07-29 | Sirtex Medical Limited | Heating of magnetic material by hysteresis effects |
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