According to group theory, spinel type oxides should exhibit four IR bands ν1-ν4. The spectra shows two bands characteristic of spinel structures: one in the 590-560 cm-1 region (ν1) and another one in the 685-665 cm-1 interval (ν2).
FTIR spectra for ZnCo2O4 and ZnCo2O4: Eu3+ calcined at different temperatures are shown in Figure 4. X-ray diffraction pattern for (a) ZnCo2O4 and (b) ZnCo2O4: Eu3+ powders calcined at different temperatures.
