Dielectric characterization of BaxSr1-xFe12O19 (x=0.05-0.35) ceramics

BaxSr1xFe12O19 (x¼0.05, 0.15,0.25,0.35)ferrites wereprepared by both the sol-gel and conventional solid state reaction techniques.The structural characteristics and dielectric properties of these ferrites were investigated and compared. BaxSr1xFe12O19 ceramics obtained by the sol-gel method show homogeneous morphology and single crystalline phase while those prepared by solid state reaction route exhibit less homogeneous morphology, being accompanied by a secondary crystalline phase (BaFe2O4). The size of the grains varies in the range 200- 300 nm for x=0.05-0.35 when the powders are prepared by sol-gel method and, 600-700 nm for the powders prepared by solistatreaction. For the same value of x, the BaxSr1-xFe12O19 ferrites obtained via sol-gel display higher permittivity and lower dielectric losses compared to those prepared by solid state reaction route.