LAUSR

Abstract An efficient and inexpensive process is presented that produces highly oriented bulk compacts made of BaM particles. Barium hexaferrite particles (BaM, nominal composition BaFe 11 O 19 ) were prepared by a chemical coprecipitation method, using different rates and types of precipitating agents (NaOH and Na 2 CO 3 ). It was demonstrated that when a large excess of Na 2 CO 3 is used, a noteworthy packing of hexagonal BaM platelets is obtained, after mechanical compaction and firing at moderate temperature (1140 °C), without including any more steps than those required for a conventional sintering process. The hysteresis loop displays a very competitive squareness of 0.88 (normalized remanent magnetization) and a coercivity of 215 kA/m, which make this BaM bulk ferrite suitable for self-biased applications.