Magnetic properties of coprecipitated barium ferrite powders as a functionof synthesis conditions

Barium ferrite is widely used as permanent magnets because of its large coe rcivity and low cost. The usual route to produce barium ferrites is the cer amic method. In order to overcome the detrimental milling effects in the ma gnetic properties, ferrite powders were obtained by coprecipitation, This m ethod can produce high purity materials with a narrow particle size distrib ution, In this work, the effects of the pH during coprecipitation, the mola r ratio (Fe/Ba), and calcination temperature on the magnetic properties wer e investigated. The products were characterized by differential thermal ana lysis, X ray diffractometry scanning electron microscopy, thermomagnetic an alysis. The magnetic properties were evaluated by vibrating sample magnetom eter, Very fine particles with intrinsic coercivities up to 392 kA/m (4.92 kOe) were achieved.