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By varying the mole percent of Fe 2 O 3 in a nickel‐zinc‐(cobalt) ferrite in very small increments, it was found that an optimum composition exists. Deviations from this composition as small as 0.1% can cause a decrease in resistivity by e.g. a factor of 1000. The ferrite is stoichiometric at the optimum composition, and its resistivity has a narrow, sharp maximum; the μ o Q product is also maximal. Such a coincidence has not been previously observed. The usual eddy‐current relation between resistivity and ac losses fails to explain this phenomenon because of the very high resistivities involved.
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Brockman et al. (1970) studied this question.
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