Effect of nickel on the structural and magnetic properties of nano structured CoZnFe2O4

Nano particles of Co(0.5-x)NixZn0.5Fe2O4 (x = 0-0.3) were synthesized by chemical coprecipitation method. Powder X-ray diffraction pattern confirms the formation of spinel phase for all the prepared samples. The lattice parameters were calculated from powder X-ray diffraction data and the result reveals that the values are less than that of bulk values. The saturation magnetization decrease for the concentration x = 0.1 and increases for all the other concentration. Further, the hysteresis loop for the concentration x = 0 and 0.1 shows that there is no coercivity and remanance at 300 K and hence the samples behaves as superparamagnetic at 300 K. The field-cooled (FC) and zero-field-cooled (ZFC) curve for the concentration x = 0 and 0.1 separates at 150 and 167 K respectively hence the prepared samples behaves as superparamagnetic at room temperature.