Next, region II is dominated by two broad bands that correspond to νas(COO -) and νs(COO -) modes of metal carboxylates, indicating the successful polymer coating. The intense band that appears in region III is characteristic of lattice Fe-O vibrations in spinel ferrites. Interestingly, as Mn 2+ content increased, this band showed a left shift, indicating the modification of Fe-O bond lengths and the rearrangement of the oxygen sublattice to accommodate different cation distributions among the octahedral and tetrahedral sites, which was affected by PMAO coating . In agreement with this, a gradual shift in the mean peak (311) position can also be seen by comparing the XRD patterns of samples before and after polymer coating, while the spinel ferrite structure was maintained (Figure ).