Preparation of finely divided and acicular hexagonal ferrites and their use for the production of magnetic recording media and plastoferrites

US4764300A · kind A · utility

Assignee

• BASF SE

Inventors

• Hartmut Hibst · Schriesheim, DE
• Peter Rudolf · Ludwigshafen, DE
• Helmut Jakusch · Bischofswerda, DE

Key dates

• Filing date: May 20, 1986
• Grant date: Aug 16, 1988
• Expiry date: May 20, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for the preparation of finely divided and acicular hexagonal ferrites of the general formula AMe.sub.x Fe.sub.12-x O.sub.19, where x is .ltoreq.4, A is barium and/or strontium and Me is indium or equimolar amounts of zinc or cobalt and titanium, and their use for the production of magnetic recording media and plastoferrites.