Abstract
A Richter-type peak of magnetic loss and the disaccommodation were observed for cobalt-substituted Ni-Zn ferrites containing Fe 2 O 3 less than the stoichiometric composition. These phenomena can be interpreted in terms of the diffusion of electrons between Co 2+ ions and Co 3+ ions. The induced anisotropy caused by the preferential occupation of Co 3+ ions in four kinds of 16d sites may explain these phenomena. Relaxation times are represented by the equation τ=τ ∞ exp ( Q / k T ), where τ ∞ are approximately 10 -17 to 10 -15 sec for the Richter-type peak and 10 -10 to 10 -11 sec for the disaccommodation. Activation energies are about 0.8 to 1.0 eV for the former, and about 0.5 to 0.7 eV for the latter.
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