Preparation of High‐Coercivity BaFe ₁₂ O ₁₉

Abstract

Particles of BaFe 12 O 12 were prepared by chemical coprecipitation; their magnetic properties were studied. A coercive force of 6000 Oe, one of the highest reported for isotropic BaFe 12 O 19 , was obtained. X‐ray and Moessbauer studies were conducted to examine the mechanism of formation. Superparamagnetic α‐Fe 2 O 3 was present during synthesis. Ferrites were sintered from these precipitated powders by both the usual method and a hot‐press‐forging method. The observed magnetic characteristics result from partial orientation of defect‐free single‐domain coprecipitated powders.