Microwave Absorbing and Magnetic Properties of the Polyaniline-Co0.7Cr0.1Zn0.2Fe2O4 Composites

oleh: Fanling MENG, Xiao WANG, Dan JIANG, Ruiting MA

Format: Article
Diterbitkan: Kaunas University of Technology 2016-09-01

Deskripsi

<p>The spinel cobalt chromium zinc ferrites (Co<sub>0.7</sub>Cr<sub>0.1</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub>) and the polyaniline (PANI)-Co<sub>0.7</sub>Cr<sub>0.1</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> composites were prepared by polyacrylamide gel and an <em>in situ</em> polymerization method, respectively. The structure of the synthesized material was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectrometer (FT-IR), which shows that the spinel Co<sub>0.7</sub>Cr<sub>0.1</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> ferrites and the PANI-Co<sub>0.7</sub>Cr<sub>0.1</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> composites are obtained. Because a small amount Co<sup>2+</sup> ion of the octahedron ferrite is replaced by Cr<sup>3+</sup> ions, the lattice constant of the Co<sub>0.8</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> ferrites reduces from 0.8409nm to 0.8377nm. The magnetic properties of the two materials were investigated using vibrating sample magnetometer (VSM). The VSM results confirm that the saturation magnetization (<em>Ms</em>), remnant magnetization (<em>Mr</em>) and coercive force (<em>Hc</em>) of the PANI-Co<sub>0.7</sub>Cr<sub>0.1</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> composites are 8.80emu/g, 3.14emu/g and 37.22kA/m, respectively, which are smaller than those of the Co<sub>0.7</sub>Cr<sub>0.1</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> ferrites. The microwave absorbing capability of the two materials were studied by wave-guide method. In the measuring frequency range of 5.0~20.0GHz, two reflection loss maximum value of the PANI-Co<sub>0.7</sub>Cr<sub>0.1</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> composites appear at 14.1GHz and 17.9GHz with -13.17dB and -15.36dB, respectively, which is obviously higher than those of the Co<sub>0.7</sub>Cr<sub>0.1</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> ferrites.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.22.3.7177">http://dx.doi.org/10.5755/j01.ms.22.3.7177</a></p>