Effect of Fe doping on the lattice structure, microscopic morphology and microwave absorption properties of LaCo1-xFexO3

Abstract

Perovskite LaCoO3 has unique mixed ionic electronic and structural defects, which has high research value in microwave absorption field. LaCoO3 precursor was prepared by sol-gel method, and LaCo1−xFexO3 (Fe-LCO, x = 0, 0.05, 0.1 and 0.15) with rhombic symmetric structure was successfully synthesized at 600 °C. By refinement of X-ray diffraction (XRD) (Rietveld analysis), it was found that Fe doping makes LaCoO3 lattice constant and cell volume increase. As a dielectric loss microwave absorbing material, the electromagnetic attenuation of LaCoO3 is mainly due to the conduction loss, while the interface and dipole polarization are secondary reasons. It finds that Fe doping can improve the wave absorption performance of LaCoO3. The best absorbing performance was obtained when Fe content is x = 0.1, with the maximum reflection loss of − 38.99 dB at 10.8 GHz and the effective absorption bandwidth (RL<−10 dB) is 4.48 GHz, while the corresponding thickness was only 3 mm. In summary, LaCoO3 has broad application prospects in X and Ku bands.