Dielectric, magnetic and microwave absorbing properties of polyaniline-Co_0.7Cr_0.1Zn_0.2Fe₂O₄ composites

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• 作者：Rui-Ting Ma ; Huai-Yu Shang ; Xiao Wang ; Dan Jiang
• 关键词：Composites ; Microwave absorbing properties ; Dielectric properties ; Magnetic properties
• 刊名：Rare Metals
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：36
• 期：2
• 页码：118-122
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials; Nanotechnology; Ceramics, Glass, Composites, Natural Materials; Surfaces and Interfaces, Thin Films; Inorganic Chemistry; Physical Chemistry;
• 出版者：Nonferrous Metals Society of China
• ISSN：1867-7185
• 卷排序：36

文摘

The spinel cobalt chromium zinc ferrites (Co_0.7Cr_0.1Zn_0.2Fe₂O₄) and the polyaniline (PANI)-Co_0.7Cr_0.1Zn_0.2Fe₂O₄ composites were prepared by polyacrylamide gel and an in situ polymerization method, respectively. The structure of the synthesized material was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectrometer (FTIR), which shows that the spinel Co_0.7Cr_0.1Zn_0.2Fe₂O₄ ferrites and the PANI-Co_0.7Cr_0.1Zn_0.2Fe₂O₄ composites are obtained. As a small amount of Co2+ in the octahedron ferrite is replaced by Cr3+, the lattice constant of Co_0.8Zn_0.2Fe₂O₄ ferrites reduces from 0.8409 to 0.8377 nm. The magnetic properties of the two materials were investigated by vibrating sample magnetometer (VSM). The VSM results confirm that the saturation magnetization (M_s), remanent magnetization (M_r) and coercive force (H_c) of the PANI-Co_0.7Cr_0.1Zn_0.2Fe₂O₄ composites are 8.80 mA·m2·g−1, 3.14 mA·m2·g−1 and 37.22 kA·m−1, respectively, which are smaller than those of the Co_0.7Cr_0.1Zn_0.2Fe₂O₄ ferrites. The microwave absorbing capability of the two materials was studied by waveguide method. In the frequency range of 5–20 GHz, two reflection loss maximum values of the PANI-Co_0.7Cr_0.1Zn_0.2Fe₂O₄ composites appear at 14.1 and 17.9 GHz with −13.17 and −15.36 dB, respectively, which are obviously higher than those of the Co_0.7Cr_0.1Zn_0.2Fe₂O₄ ferrites.