Effects of the incorporation of Fe on the electromagnetic and microwave absorption performance of La sub(0.7)Sr sub(0.3)MnO sub(3 plus or minus delta )

The pure perovskite structure La sub(0.7)Sr sub(0.3)Mn sub(1- chi )Fe sub( chi )O sub(3 plus or minus delta ) ( chi =0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and 0.35) powders were fabricated by the traditional solid state reaction method. Effects of the incorporation of Fe into La sub(0.7)Sr sub(0.3)MnO sub(3 plus or minus delta ) on the permittivity and permeability were examined, and the microwave absorption performance was also investigated. The electromagnetic loss was notably enhanced, and the microwave absorption performance was improved after Fe doping. The absorbing peak shifted to the lower frequency after Fe doping. The 20 at% Fe-doped La sub(0.7)Sr sub(0.3)MnO sub(3 plus or minus delta ) powders had the best microwave absorption property. The maximum reflection loss was -27.67 dB at 10.97 GHz, and the -6 dB absorbing bandwidth was 6.81 GHz with a matching thickness of 2 mm.