JPS54128496A - Magnetic powder - Google Patents
Magnetic powderInfo
- Publication number
- JPS54128496A JPS54128496A JP3697378A JP3697378A JPS54128496A JP S54128496 A JPS54128496 A JP S54128496A JP 3697378 A JP3697378 A JP 3697378A JP 3697378 A JP3697378 A JP 3697378A JP S54128496 A JPS54128496 A JP S54128496A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- magnetic
- regulated
- powder
- coercive force
- 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.)
- Pending
Links
Abstract
PURPOSE: To provide γ-Fe2O3 magnetic powder with small particle size and high coercive force useful as a high density magnetic recording medium of high performance.
CONSTITUTION: The γ-Fe2O3 magnetic powder for a magnetic medium has a BET specific surface area above 40 and a coercive force above 380 Oe. This powder can be produced as follows: the ratio of anion such as sulfate ion to Fe2+ in ferrous sulfate or the like is regulated to below 1. The regulated ferrous sulfate is then oxidized with air, and the resulting needle-like goethite is subjected to heat dehydration, reduction and oxidation.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3697378A JPS54128496A (en) | 1978-03-30 | 1978-03-30 | Magnetic powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3697378A JPS54128496A (en) | 1978-03-30 | 1978-03-30 | Magnetic powder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54128496A true JPS54128496A (en) | 1979-10-05 |
Family
ID=12484683
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3697378A Pending JPS54128496A (en) | 1978-03-30 | 1978-03-30 | Magnetic powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54128496A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4914400A (en) * | 1972-05-23 | 1974-02-07 | ||
JPS49114800A (en) * | 1973-03-09 | 1974-11-01 |
-
1978
- 1978-03-30 JP JP3697378A patent/JPS54128496A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4914400A (en) * | 1972-05-23 | 1974-02-07 | ||
JPS49114800A (en) * | 1973-03-09 | 1974-11-01 |
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