Abstract
We report a phase diagram, structural and magnetic properties of magnetoplumbite-type (M-type) Sr1−xBixFe12O19 (0.0 ≤ x ≲ 0.3) synthesized under various oxygen potentials, pO2= 0–10 atm. A systematic composition analysis for single and polycrystalline samples reveals that Bi substitutes for the Sr site in SrFe12O19. Within a solubility limit of x ≈ 0.3, obtained by synthesis under pO2 = 0.01 atm, the Bi solubility is mostly determined by the reduction amount of Fe3+ to Fe2+ to compensate a charge imbalance. The Bi3+ doping results in lattice parameters, a and c, with trends different from those by La3+ doping, reflecting different spatial characters of La3+ and Bi3+ ions. However, a nearly identical linear decrease in the lattice-parameter ratio c/a indicates that Bi3+ can provide the function of La3+ in high-performance substituted M-type ferrites. The doping dependence of magnetic properties, particularly the saturation magnetization and the anisotropy field, are examined and compared between the Bi- and La-substituted cases.
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