Crystallographic and Magnetic Properties of Li0.7Co0.2Ti0.2V0.2Fe1.7O4 Ferrite

This study examined the crystallographic and magnetic properties of vanadium-substituted lithium cobalt titanium ferrite, Li0.7Co0.2Ti0.2V0.2Fe1.7O4. Ferrite was synthesized using a conventional ceramic method. The samples annealed below 1040 degrees C showed X-ray diffraction peaks for spinel and other phases. However, the sample annealed above 1040 degrees C showed a single spinet phase. The lattice constant of the sample was 8.351 angstrom, which was relatively unaffected by vanadium-substitution. The average grain size after vanadium- substitution was 13.90 mu m, as determined by scanning electron microscopy. The Mossbauer spectrum could be fitted to two Zeeman sextets, which is the typical spinel ferrite spectra of Fe3+ with A and B sites, and one doublet. From the absorption area ratio of the Mossbauer spectrum, the cation distribution was found to be (Co0.2V0.2Fe0.6)[Li0.7Ti0.2Fe1.1]O-4. Vibrating sample magnetometry revealed a saturation magnetization and coercivity of 36.9 emu/g and 88.6 Oe, respectively, which were decreased by vanadium-substitution.