Low temperature processing of Mn–Zn nanoferrites

Mn0.4Zn0.6Fe2O4 ferrite synthesized by coprecipitation method is investigated in the present work. D.C. resistivity is studied as a function of temperature and values upto 102 times greater than those for samples prepared by the conventional ceramic method are observed. It is found that resistivity decreases with increase in temperature. The initial permeability values are high as compared to those prepared by soft chemical route. Initial permeability is found to increase with increase in temperature. At a certain temperature, called the Curie temperature, it attained a maximum value, after which the initial permeability is found to decrease. Even at nanolevel, appreciable value of initial permeability is obtained. The particle size is calculated using Scherrer equation for Lorentzian peak, which comes out between 9 nm and 19 nm. Possible mechanisms contributing to these processes have been discussed.