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.