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The spinel cobalt chromium zinc ferrites(Co_(0.7)Cr_(0.1)Zn_(0.2)Fe_2O_4) and the polyaniline(PANI)-(Co_(0.7)Cr_(0.1)Zn_(0.2)Fe_2O_4 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_(0.7)Cr_(0.1)Zn_(0.2)Fe_2O_4 ferrites and the PANICo_(0.7)Cr_(0.1)Zn_(0.2)Fe_2O_4 composites are obtained.As a small amount of Co~(2+) in the octahedron ferrite is replaced by Cr~(3+),the lattice constant of Co_(0.8)Zn_(0.2)Fe_2O_4 ferrites reduces from0.8409 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_(0.7)Cr_(0.1)Zn_(0.2)Fe_2O_4composites are 8.80 mA·m~2·g~(-1),3.14 mA·m~2·g~(-1) and37.22 kA·m~(-1),respectively,which are smaller than those of the Co_(0.7)Cr_(0.1)Zn_(0.2)Fe_2O_4 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_(0.7)Cr_(0.1)Zn_(0.2)Fe_2O_4composites 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_(0.7)Cr_(0.1)Zn_(0.2)Fe_2O_4 ferrites.
The spinel cobalt chromium zinc ferrites (Co_ (0.7) Cr_ (0.1) Zn_ (0.2) Fe_2O_4) and the polyaniline (PANI) - (Co_ (0.7) Cr_ (0.1) Zn_ (0.2) Fe_2O_4 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_ (0.7) Cr_ (0.1) Zn_ (0.2) Fe_2O_4 ferrites and the PANICo_ (0.7) Cr_ (0.1) Zn_ (0.2) Fe_2O_4 composites are obtained. As a small amount of Co ~ (2+) in the octahedron ferrite is replaced by Cr ~ (3 + (0.8) Zn 0.2 Fe 2 O 4 ferrites reduces from 0.8409 to 0.8377 nm. The VSM results confirm that the saturation magnetization (M_s), remanent magnetization (M_r ) and coercive force (H_c) of the PANI-Co_ (0.7) Cr_ (0.1) Zn_ (0.2) Fe_2O_4 composites are 8.80 mA · m ~ 2 · g -1, 3.14 mA · m -2 · g ~ 1) and 37.22 kA · m ~ (-1), respectively, which are smaller than those of Co_ (0.7) Cr_ (0.1) Zn_ (0.2) Fe_2O_4 ferrites.The microwave absorbing capability of the two materials was studied by waveguide method. -20 GHz, two reflection loss maximum values of the PANI-Co_ (0.7) Cr_ (0.1) Zn_ (0.2) Fe_2O_4composites 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_ (0.7) Cr_ (0.1) Zn_ (0.2) Fe_2O_4 ferrites.