Coercivity of the Co-precipitated prepared hexaferrites, BaFe <inf>12-2x</inf>Co<inf>x</inf>Sn<inf>x</inf>O<inf>19</inf>

Abstract

Two series of Co-Sn doped M-type barium hexaferrites were fabricated using a co-precipitation method. Hexaferrites having the nominal composition BaFe 12O19 were soaked at various temperatures (950, 1000, 1050, 1100. 1150 and 1200°C) for four h. The particle sizes of the resulting ferrites were seen to increase as the soaking temperatures were raised. A second series having the composition BaFe12-2xSnxCo xO19 (z = 0.0, 0.25, 0.50, 0.75 and 1.00) were also fabricated using one soaking temperature (1000°C). EDX (Energy dispersive X-ray) measurements were used to determine the actual chemical compositions of the specimens. The coercivities of the specimens of both series were measured with a vibrating samples magnetometer. We observed that the coercivities of the undoped series decreased as the soaking temperature increased and that the coercivities of the doped series increased as the impurity concentration increased.