Abstract

Measurements are reported of the electrical resistivity of nickel ferrites having cobalt substitutions of up to 5%. For certain compositions large resistivities are found due to the buffering action of the cobalt ions, which behave in this respect similarly to managanese ions in nickel ferrite. Some differences are observed between cobalt- and manganese-doped materials and these are explained on the assumption that, although Co2+ ions may be readily substituted for Ni2+ ions, there exists a limiting concentration to which cobalt can replace iron in the ferrite lattice. Magnetization measurements are found to be in good agreement with this hypothesis.

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