Nanoparticles of spinel ferrites MnxZn1-xFe2O4 with x = 0.0 to 1.0 were prepared by co-precipitation method. The ferrite samples were pre-sintered at 200°C at the rate of 200°C/h for 15h. Finally, one set of samples was sintered at 400°C and the other set at 500°C at the rate of 200°C/h for another 15h. The spinel structure was confirmed by X-ray diffraction (XRD) pattern. The particle size was calculated by using Debye–Scherrer's equation for Lorentzian peak. The calculated average particle size lies between 19–53 nm. The particle size was also investigated by using scanning electron microscopy (SEM). Both the results were found to be in good agreement. The resistivity data was taken by two probe method and resistivity, activation energy and porosity were calculated. There was an increase in the resistivity and activation energy when the ferrite samples were sintered at a higher temperature. Possible models, theories and mechanisms contributing to these processes have been discussed.
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