Effects of the incorporation of Fe on the electromagnetic and microwave absorption performance of La0.7Sr0.3MnO3±δ

The pure perovskite structure La0.7Sr0.3Mn1−χFeχO3±δ (χ=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 La0.7Sr0.3MnO3±δ 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 La0.7Sr0.3MnO3±δ 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.