Structural, magnetic and dielectric properties of cerium-doped manganese - cobalt ferrite nanoparticles

Co0.50Mn0.50Ce x Fe2-xO4 (with x = 0.000, 0.025, 0.050 and 0.100) nanoparticles were synthesised through sol-gel method. The crystallite size and lattice constant are increased from 30 to 50 nm and 8.375 to 8.384 & Aring;, respectively, with increasing Ce content. It was found that Fe3+ cations migrate towards octahedral sites with Ce doping. The optical band gap was decreased from 1.79 to 1.50 eV whereas saturation magnetisation was decreased from 57 to 49 emu/g with increase in Ce substitution. Maximum dielectric constant and minimum dielectric loss, maximum AC conductivity along with moderate magnetic properties were observed for x = 0.050. So, x = 0.050 may be a potential candidate for electromagnetic interference shielding applications.