XRD diffraction patterns of Mn doped structures and pure ZnO
are shown in Fig. 3. The spectra of doped samples show two sets
of peaks, one related to the hexagonal wurtzite structure of ZnO
and a second one that is ascribed to a ZnMn2O4 spinel phase that
appear in the nano- and microstructures. No peaks related to any
other second phase such as Mn oxides have been found