MECHANOCHEMICALLY ASSISTED PREPARATION PROCESS OF BARIUM HEXAFERRITE POWDERS

A new process of solid state synthesis of BaFe12O19 with the assistanc e of mechanochemical hydration of Fe2O3 under planetary mill treatment is proposed. The increased surface polarity of hydrated Fe,O, induced coagglomeration with Ba(OH)(2) . H2O in less-hydrophilic organic liqu ids. Concurrent progress in size reduction enabled elaboration of micr o-coagglomerates less than 1 mu m in size. The organic liquid media wi th adequate specific capacity and low viscosity resulted in enhanced r eactivity and led BaFe12O19 powders with excellent magnetic properties and sufficient sinterability without irregular grain growth.