DC resistivity of Mn-Ni-Zn ferrites

DC resistivity of MnxNi0.5-xZn0.5Fe2O4 with compositions x = 0.05 to 0.4 prepared by the citrate precursor method has been investigated. It has been observed that resistivity decreases with increase in Mn concentration. The observed temperature variation curves show two linear regions. Activation energy corresponding to both regions has been calculated. Possible conduction mechanisms contributing to the processes have been discussed. Variation of resistivity with sintering temperature establishes a correlation between microstructure and conductivity.