Crystallographic and Magnetic Properties of Li_0.7Co_0.2Ti_0.2V_0.2Fe_1.7O₄Ferrite

This study examined the crystallographic and magnetic properties of vanadium-substituted lithium cobalt titanium ferrite, $Li_0.7Co_0.2Ti_0.2V_0.2Fe_1.7O_4$. Ferrite was synthesized using a conventional ceramic method. The samples annealed below $1040^\circC$ showed X-ray diffraction peaks for spinel and other phases. However, the sample annealed above $1040^\circC$ showed a single spinel phase. The lattice constant of the sample was $8.351\;{\AA}$, 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 M$\ddot{o}$ssbauer 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 M$\ddot{o}$ssbauer spectrum, the cation distribution was found to be ($Co_0.2V_0.2Fe_0.6)[Li_0.7Ti_0.2Fe_1.1]O_4$. 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.