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Ni1-xCoxFe2O4 (x = 0, 0.2, 0.4, 0.6, 0.8) ceramics were prepared by chemical  co-precipitation method and the effect of Co ion doping on the  microstructure, magnetic and dielectric properties has been investigated.  The results show that the synthesized ceramics display only spinel phase of  Ni1-xCoxFe2O4, without other apparent impurities found. The lattice of  Ni1-xCoxFe2O4 crystal structure was distorted as a result of the  incorporation of Co ion, and the lattice parameters increase with the  increase of Co ion content. The grain size decreases slightly with  increasing the content of Co ion, indicating a change of particle size and  morphology at higher doping content. The results of impedance analysis shows  that the sample doped with 80 at.%Co possesses the maximal dielectric  constant, while the pure NiFe2O4 sample shows the minimal value when the  frequency is below 0.1MHz. The M-H loops of these ceramics exhibit highly  magnetic nature and the saturation magnetization. The remnant magnetization  increases linearly with the increase of Co-concentration in nickel ferrite  while the coercive field (Hc) shows non-monotonic variation with Co content.  The minimal and maximal values of Hc can be obtained when the Co  concentrations are 40 and 80 at.%, respectively. The highest value of the  saturation magnetization is 63 emu/g obtained with 80 at.% Co doping while  the lowest value is ~31 emu/g for the pure NiFe2O4 ceramics. The abnormal  magnetic behaviour is due to the A-B super exchange interaction when  magnetic Co2+ ions are added.

Influence of Co ion doping on the microstructure, magnetic and dielectric properties of Ni1-xCoxFe2O4 ceramics