Intrinsic coercive force measurements were made on BaFe 12 O 19 in which certain amounts of Fe were substituted by In, Cr, Al, Ga, ZnGe, ZnV, ZnNb or ZnTa. The specimens were prepared by the ordinary powder metallurgy method. X-ray diffraction of the specimens indicated only the presence of the magnetoplumbite phase within the experimental substitution range. A large increase in coercive force i H c , observed when Cr, Al or Ga were substituted, was mainly due to the onset or the approach of single-domain behaviour at higher concentrations even under the same milling condition. In the case of Al substitution, the increase of magnetocrystalline anisotropy field H a also contribute greatly to the abrupt rise of i H c . In the case of the other substitutions, the value of i H c decreased without an appreciable change in the single-domain critical size; this decrease might be due to the decrease in H a .
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Haneda et al. (1973) studied this question.