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Microwave wide-spread results in electromagnetic interference, environmental pollution, and hazards for health, thus microwave absorber is immediately needed. Mn 4+ doped barium natural ferrites were synthesized using the modified solid-state reaction method, which is a combination of the sol-gel method and the solid-state reaction. Commercial Ba(NO 3 ) 2 , MnO 2  and natural Fe 3 O 4  were used as raw materials. Structural, magnetic properties and microwave absorption of the barium ferrites were characterized using XRD, VSM, and VNA, respectively. The results reveal that phase of BaFe 2.37 Mn 9.63 O 19  dominates the diffraction peaks with the average size of crystallite 23.74 nm after adding Mn 4+  ions in the barium ferrites.  Ms  value of the barium ferrite decreases with increasing concentrations of Mn 4+  due to the surface effect of the nanoparticle. The MBF3 exhibited excellent performance that absorbs all given microwave frequencies with  R L below -10 dB and bandwidth of 4 GHz compared to the other samples.

Magnetic and microwave absorption properties of Mn4+ doped barium-natural ferrites prepared by the modified solid-state reaction method

Magnetic and microwave absorption properties of Mn⁴⁺ doped barium-natural ferrites prepared by the modified solid-state reaction method