Effect of Weight Percent and Particle Size of (Mg,Ti) Substituted Barium Hexaferrite Powder on Reflection loss Plots of Metal Back Ferrite/Acrylic Resin Composite

Barium hexaferrite compositions with different cation substitutions are known as one of the most studied materials to produce microwave absorbing composites. In the present research (Mg,Ti) substituted barium hexaferrite with chemical formula of BaFe9(Mg1.5Ti1.5)O19 have been studied. In order to investigate the effect of particle size and powder percent, micron-size (about 3μm) and nano-size (below 100nm) were synthesized via a modified sol-gel method by controlling the ingredients ratio and calcination temperature. Chemical phase formation and morphological studies were performed by XRD and SEM, respectively. In order to investigate the microwave absorption quality of the samples, ferrite/acrylic resin composites with different powder weight percents were produced. As a criterion of the microwave absorption capability, the reflection loss (RL) plots were measured at X and Ku band by the Vector Network Analyzer system and metal back method. It was found that nano-size particles have better microwave absorption efficiency and the results of the investigation may be used to enhance the design of microwave absorbing composites and their absorption performance.