Synthesis and Characterization of Rare Earth Elements Substituted X-type Hexagonal Ferrites

A series of Sr1.96 RE0.04 Co2Fe27.80Mn0.2O46 (RE= Ce, Gd, Nd, La, Sm) X-type hexagonal ferrites was prepared by Sol gel method. The lattice constants a (Å) and c (Å) varies with the doping concentrations. The magnetic properties vary with the substitution of different rare earth elements. The Gd-substituted ferrite has higher value of coercivity (526.06 G) among the all samples which could be a good ma-terial for longitudinal recording media. The results indicate that the Gd-substituted sample with maximum reflection loss of -25.2 dB at 11.878 GHz can exhibits the best microwave absorption properties among all the samples. Furthermore, the minimum value of reflection loss shifts towards the lower and higher frequencies with the substitution of rare earth elements which confirms that the microwave absorption properties can be tuned with the substitution of rare earth elements in pure ferrites.