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

摘要

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 deg C, 740 deg C, 870 deg C and 1000 deg C. Zn~(2+) began to diffuse into Co_3O_4 and Fe_2O_3 at temperature of about 600 deg 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 CoFe_2O_4. At the temperature of 1000 deg C, cobalt ferrite with a smaller crystal lattice parameter was obtained by over Co_3O_4 other than the lager crystal lattice as reported. And Zn-doped CoFe_2O_4 with the uniform particles was produced.