X-ray photoelectron spectroscopy and low temperature Mossbauer study of Ce3+ substituted MnFe2O4

Spinel Mn2+ Fe3+O-4 (where x=0.01-0.05) polycrystalline nanoparticles were fabricated by solution combustion method using glucose and urea as fuels. X-ray diffractogram (XRD) proved the witness of the cubic crystal consort of products which have the crystallite sizes in between 12 and 8nm. The size of the sample was accomplished via transmission electron microscopy. The elemental composition of iron and manganese ions valences of MnCexFe2-xO4 samples were analyzed by X-ray photoelectron spectroscopy. XPS data reveals iron in all samples was trivalent; manganese was divalent, although tetravalent manganese ions were present on the surface of particles. Magnetic characterization of samples was done via Mossbauer spectroscopy at room temperature and at low temperatures (15K). The Mossbauer analysis determines the consequence of Ce3+ substitution on isomer shift and quadrupole splitting of all samples. The low temperature Mossbauer spectroscopy results indicate that the presence of Ce3+ ions in the octahedron sites causes the decrease in the concentration of Fe3+ ions.