کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1614403 | 1516332 | 2013 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Enhanced microwave absorption properties of carbonyl iron/Fe3O4 composites synthesized by a simple hydrothermal method Enhanced microwave absorption properties of carbonyl iron/Fe3O4 composites synthesized by a simple hydrothermal method](/preview/png/1614403.png)
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.
► Higher imaginary part of the complex permeability and higher electric resistivity achieved because of the ferromagnetic property of Fe3O4.
► The reflection loss of the sample exceeding −10 dB was obtained at the frequency range of 8.7–15.0 GHz.
► The optimal reflection loss of −38.1 dB was achieved at 11.5 GHz for the thickness of 2.0 mm.
Journal: Journal of Alloys and Compounds - Volume 561, 5 June 2013, Pages 65–70