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• Fisica 3 Caricatura

Fisica 3 Caricatura

X-ray diffraction pattern for (a) ZnCo2O4 and (b) ZnCo2O4: Eu3+ powders calcined at different temperatures. FTIR spectra for ZnCo2O4 and ZnCo2O4: Eu3+ calcined at different temperatures are shown in Figure 4. 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). According to group theory, spinel type oxides should exhibit four IR bands ν1-ν4 [Lefez et al, 1996]. In the present study, however, measurements were carried out up to 500 cm-1 thus limiting the discussion to the high frequency bands (ν1 and ν2) of the IR spectrum. The frequencies ν1 and ν2 are assigned to F1u vibrations of the octahedral groups of the ZnCo2O4 spinel [Lefez et al, 1996; Basak and Ghose, 1994; Kustova et al, 2000; Preudhomme et al, 1971]. The FTIR spectrum should not show any changes in the frequencies ν1 and ν2 resulting from the presence of Eu3+ ions in the doped spinel oxides.