Effect of sintering conditions on the magnetic disaccommodation in barium M-type hexaferrites

Abstract The relaxation of the initial magnetic permeability has been measured in polycrystalline hexaferrites with nominal composition BaO·6Fe 2 O 3 (i.e. M-type). The samples have been sintered at different temperatures in CO 2 atmosphere and with different manufacturing conditions. In temperature range between 80 and 500 K, the magnetic disaccommodation shows presence of different relaxation processes, depending on both the sintering temperature and sintering time. The analogies and differences between the results obtained are discussed in terms of similar phase formation and different crystallite size.