In addition,
Fig. 3. XRD spectra recorded on ZnO:Mn structures (solid line) and pure ZnO (dotted
line). The marks indicate peaks which correspond to ZnMn2O4 spinel phase. Inset
shows a zoom of first three reflections of wurtzite ZnO.
the ZnO peaks are shifted towards lower angles (see inset in Fig. 3)
indicating an increase in lattice parameter due to the substitution
of smaller Zn2+ ion (∼0.6A˚ ) by bigger sized Mn2+ (∼0.66A˚ ) in the
structures [16].