ELECTRICAL-CONDUCTIVITY OF MN-ZN FERRITES

The electrical conductivity of polycrystalline mixed ferrite system ha ving the chemical formula MnxZn1-xFe2O4 (where x = 0.0, 0.2, 0.4, 0.6, and 0.8) was investigated from room temperature to the neighborhood o f the Curie temperature by the two-probe method. The electrical conduc tion in these ferrites is explained on the basis of the hopping mechan ism. Plots of log (sigmaT) verSUS 10(3)/T are almost linear and show a transition near the Curie temperature. The activation energy in the f errimagnetic region is in general less than that in the paramagnetic r egion.