Production of ferrimagnetic iron oxide

Details Production of ferrimagnetic iron oxide Production of ferrimagnetic iron oxide

G - Physics

11

B

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G11B 5/62 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1143143

Bayer 3579 LH:sl PRODUCTION OF FERRIMAGNETIC IRON OXIDE ABSTRACT OF THE DISCLOSURE Thermally stabilized ferrimagnetic iron oxide with a coercive field strength of about 350 to 500 Oe which, upon incorporation into a magnetic tape, shows an improvement of at least 5 dB in the ratio of recording level at a frequency of 10 K c/s to background noise in relation to a standard reference tape, is produced by subjecting an iron (II) salt solution to precipitation and oxidation at a pH below 7 to produce acicular .alpha.-FeOOH, terminating the oxidation upon reaching a pH below 4, chemically stabilizing the .alpha.-FeOOH and dehydrating, tempering and reducing it to iron oxide. Le A 18 577

319499

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