The diffraction peaks corresponding to Fe3O4 and ZnS isolated phases and doped-Mn2+
Fe3O4/ZnS (20 and 25 percentages of dopant species) combined phases are shown in Figure 30.
These concentrations were put to evidence that at smaller concentrations we did not find any
luminescent peak belonging to the Mn2+ paramagnetic ion. All peak broadenings suggest that
these phases as isolated as combined present sizes at nanoscale. The isolated characteristic peaks
attributed to face-centered cubic structure of Fe3O4 and the cubic ZnS phase nanoparticles
according to the standard JCPDF [8] are also verified in this Figure. From the peaks of the coreshell
system can be deduced that, in fact, there was a development of both phases at nanoscale.
Additionally, it can be observed a good substitution between paramagnetic Mn2+ (ionic radii 67
pm) ion and Zn2+ (74 pm) ion which did not modify the unit cell of host material. The structural
matching of the core and shell materials were guaranteed due to that both materials possess cubic