Chapter 5 Fundamental properties of hexagonal ferrites with magnetoplumbite structure

Publisher Summary This chapter discusses the fundamental properties of hexagonal ferrites with magnetoplumbite structure. Ferrimagnetic properties of the magnetoplumbite type compounds are naturally based on the superexchange interaction of Fe–O–Fe, so that no remarkable effect on the magnetic properties would be expected by the replacement of a Ba ion. However, the properties could be influenced to some extent by the changes in the distance or the angle between Fe–O–Fe arising from the substitution, leading to differences among BaM, SrM, and PbM. Further, the most typical way to obtain the ferrimagnetic hexagonal oxides as powder or in a sintered polycrystalline state is the solid–state reaction of heating the mixtures of constituent oxides or of compounds that are easily changed to oxides by heating. BaCO 3 , SrCO 3 , PbO, and α-Fe 2 O 3 are generally used as starting materials, but oxalates, sulfates, chlorides, nitrates, or hydroxides are also used for specific purposes. Proper reaction temperature, atmosphere, and cooling conditions should be chosen according to the phase diagrams. However, single-phase M type compounds can be usually obtained by heating in air between 800 °C and 1200°C, and just removing from the furnace.

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