aDepartment of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, People’s Republic of China
bKey Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
cSchool of Physics and Electronics Information, Huaibei Normal University, Huaibei 235000, People’s Republic of China
Corresponding author at: Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, People’s Republic of China. Tel.: +86 551 6559 5612; fax: +86 551 6559 1434.
Carbonyls iron powders (CIPs)/Fe3O4 composites have been prepared by a simple hydrothermal method through controlling the pH value of the reaction system. The obtained products were characterized by X-ray diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), superconducting quantum interference device magnetometer (SQUID), thermogravimetry–differential thermal analysis (TG–DTA), etc. The microwave absorption properties of the CIP/Fe3O4 composites were measured by vector network analysis (VNA). A wide region of microwave absorption was achieved due to the high permeability of CIP/Fe3O4 composites (pH = 13). When the matching thickness is 2 mm, the reflection loss of the sample exceeding −10 dB was obtained at the frequency range of 8.7–15.0 GHz, with an optimal reflection loss of about −38.1 dB at 11.5 GHz. A possible mechanism of the improved microwave absorption properties of the composites was discussed.