Electrical conductivity of Mn–Zn ferrites

The electrical conductivity of polycrystalline mixed ferrite system having 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 of the Curie temperature by the two‐probe method. The electrical conduction in these ferrites is explained on the basis of the hopping mechanism. Plots of log (σT) versus 103/T are almost linear and show a transition near the Curie temperature. The activation energy in the ferrimagnetic region is in general less than that in the paramagnetic region.