Influence of Fe-doping on the microstructure and electromagnetic performance of manganese oxides

Abstract A simple wet chemical method was used to synthesize Fe-doped MnO 2 composites with iron amount ranging from 0 to 90 M percent. X-ray diffraction, electron probe micro-analyzer, scanning electron microscopy and vector network analyzer were employed to investigate the effect of iron doping on the microstructure and electromagnetic performance of the as-synthesized samples. Results indicate that relative small content of Fe-doping cannot change the α -MnO 2 structure but can promote the formation of hollow-structural morphology. The as-obtained products are transformed into a novel compound (Fe 0.67 Mn 0.33 )OOH with the increase of Fe-doping to 30 mol%. The possible formation mechanism was proposed in detail. Compared with the pure MnO 2 , the Fe-doped samples exhibit decreased dielectric loss but increased magnetic loss with increasing the iron content below 20 mol% while relatively poor electromagnetic properties with the iron content above 30 mol%.