Effect of neodymium doping on microwave absorption property of barium hexaferrite in X-band

Abstract

M-type barium hexaferrite (BaFe _12 O _19 ) particles are synthesized by using sol-gel auto-combustion reaction for microwave absorption study in X-band. Three different materials namely BaNd _0.02 Fe _11.98 O _19 (Nd2), BaNd _0.04 Fe _11.96 O _19 (Nd4) and BaNd _0.06 Fe _11.94 O _19 (Nd6) have been developed by varying doping of neodymium in barium hexaferrite. The synthesis of particles has been confirmed using SEM micrographs and XRD diffraction pattern. The hysteresis study is carried out for saturation magnetization using vibrating sample magnetometer (VSM). As the doping concentration of neodymium increases, the saturation magnetization of the material is decreased from 47.272 emu g ^−1 to 16.479 emu g ^−1 . The vector network analyzer (VNA) is used for complex permittivity and complex permeability measurements of the developed materials. Nd4 material shows highest values of permittivity and permeability losses among other developed materials. From the complex permittivity and complex permeability, the reflection loss results of the developed materials have been calculated. The maximum reflection loss of −33.17 dB was obtained for 2.2 mm pallet of BaNd _0.04 Fe _11.96 and −10 dB bandwidth reaches 2.94 GHz.

Keywords

• saturation magnetization
• reflection loss
• auto-combustion