Abstract
The electrical conductivity of Ni-Zn and copper-substituted Ni-Zn ferrites is investigated in the range 300 to 1000 K. It is seen that the plots of log ϱ against 103/T exhibit a linear relationship. There are four distinct regions exhibited by the Ni-Zn ferrite. However, with the substitution of copper there appears to be gradual disappearance of the fourth region. Also for the samples of Ni-Zn ferrite with more than 80% Zn, there are only three regions in the variation of log ϱ with 103/T. The breaks and discontinuities are attributed to several sources. The electrical conduction in these ferrites is explained on the basis of a hopping mechanism. The activation energy in the paramagnetic region is found to be more than that for the ferri magnetic region. This is attributed to the effect of the magnetic ordering in the conduction process.
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