Effect of ZnO-doping on the reaction between Co and Fe oxides

The effects of zinc oxide on the solid–solid interactions between cobalt and ferric oxides have been investigated by DTA–TG, XRD and SEM technologies. The dopant concentration was less than 0.6, and the solids were calcined at a series temperature of 600 °C, 740 °C, 870 °C and 1000 °C. Zn2+ began to diffuse into Co3O4 and Fe2O3 at temperature of about 600 °C, by which the ionic mobility was enhanced. Therefore, the ZnO-doping could decrease the temperature of chemical reactions between cobalt and ferric oxides to produce CoFe2O4. At the temperature of 1000 °C, cobalt ferrite with a smaller crystal lattice parameter was obtained by over Co3O4 other than the lager crystal lattice as reported. And Zn-doped CoFe2O4 with the uniform particles was produced.