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Semiconducting Ni₀. ₄Zn₀. ₆Fe₂O₄, prepared in different ways, has been investigated. It appeared that the ac resistivity and the apparent dielectric constant of the material show a dispersion which can be explained satisfactorily with the help of a simple model of the solid: there should be well-conducting grains separated by layers of lower conductivity. Dispersion formulas are given. There is good agreement between experiment and theory.
C. G. Koops (Sun,) studied this question.
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