| In this article, the Co0.8-x Cux Zn0.2Fe2O4(x=0, 0.1, 0.2, 0.3, 0.4) and Co0.7Cu0.1Zn0.2Cex Fe2-x O4( x=0.05, 0.1, 0.15, 0.2) ferrites were prepared by self-propagating method, and the PPy-Co0.7Cu0.1Zn0.2Fe2O4 and PPyCo0.7Cu0.1Zn0.2Ce0.05Fe1.95O4 nanocomposites were synthed by in situ polymerization method in this article. And the products were characterized by X-raydiffraction(XRD), scanning electron microscopy(SEM), Fourier transformin frared(FT-IR) spectrometer, ultraviolet-visible(UV-vis) spectrometer, vibrating sample magnetometer(VSM) and the vector network analyzer. Then the properties of the ferrites influenced by the content of the Cu2+ and Ce3+ and the properties of the composites influenced by the mass fraction of ferrites.(1) It can be seen from the XRD pattern that the Co0.8-x Cux Zn0.2Fe2O4, Co0.7Cu0.1Zn0.2Cex Fe2-x O4, PPy-Co0.7Cu0.1Zn0.2Fe2O4 composites and PPyCo0.7Cu0.1Zn0.2Ce0.05Fe1.95O4 composites were obtained, which is in conformity with the results of the FT-IR. From the XRD, it can also be concluded that both of the typies of the ferrites are spinel, the particle size of the Co0.8-x Cux Zn0.2Fe2O4(x=0,0.1,0.2,0.3,0.4) and Co0.7Cu0.1Zn0.2Cex Fe2-x O4(x=0.05,0.1,0.15,0.2)ferrites is 47.8nm, 62.1nm, 58.8nm, 59.3nm, 58.0nm, 50.0nm, 51.9nm, 47.6nm and 42.5nm, and the lattice constant is 0.839, 0.833, 0.833, 0.836, 0.836, 0.833, 0.936, 0.837 and 0.838, respectively.(2) The SEM pictures show that the morphology of Co0.8Zn0.2Fe2O4 ferrites is in irregular shape, which is bar, flake and so on. While the Co0.7Cu0.1Zn0.2Fe2O4 and the Co0.7Cu0.1Zn0.2Ce0.05Fe1.95O4 ferrites are nearly spherical particles. And all those ferrites are in a degree of reunion. The microstructure of PPy, PPy-Co0.7Cu0.1Zn0.2Fe2O4 and PPy-Co0.7Cu0.1Zn0.2Ce0.05Fe1.95O4 is nearly spherical, the size is consistent, and the structure is neat, while the particals has a certain reunion phenomenon.(3) The results of the VSM show that the Ms, Mr and Hc of Co0.7Cu0.1Zn0.2Fe2O4 ferrites are 83.6emu/g, 33.35emu/g and 454.54 Oe respectively, which is higher than those of the Co0.8Zn0.2Fe2O4. While the magnetic parameters reduce with the introduction of the Ce3+, and the Ms, Mr and Hc of Co0.7Cu0.1Zn0.2Ce0.05Fe1.95O4 ferrites are 66.0emu/g, 23.6emu/g and 341.56 Oe. The Ms, Mr and Hc of PPy-Co0.7Cu0.1Zn0.2Fe2O4 are 1.29emu/g, 0.429emu/g and 489.177 Oe, and the magnetic parameters of PPy-Co0.7Cu0.1Zn0.2Ce0.05Fe1.95O4 composites are 5.75emu/g, 2.00emu/g and 437.97 Oe.(4) The result of vector network analyzer shows that the ε’ of Co0.8-x Cux Zn0.2Fe2O4 ferrites has maximum value when x=0.2, and the influence of the mole ratio of Co2+ and Cu2+ on the ε’’ and R is not obvious. The ε’ of Co0.7Cu0.1Zn0.2Cex Fe2-x O4 ferrites has the maximum value which is 4.06, which appears in the frequency of 11.52 GHz when x=0.1. In the Co0.7Cu0.1Zn0.2Cex Fe2-x O4 ferrites, the value of ε’’ is in the-1.0-1.0, and the content of the Ce3+ has little influence on it. While the reflection loss has the minimum value which is-1.427 d B at the frequency of 12.4GHz, when x=0.05. For the PPy-Co0.7Cu0.1Zn0.2Fe2O4 composites, the reflection loss has the minimum value which is-12.8d B at 18 GHz, when wt%(Co0.7Cu0.1Zn0.2Fe2O4) is 15%. The ε’ of the PPy-Co0.7Cu0.1Zn0.2Ce0.05Fe1.95O4 composite will achieve the maximum when wt%(Co0.7Cu0.1Zn0.2Ce0.05Fe1.95O4) is 10%, the maximum value of ε’’ is 3.33 at the frequency of 12.23 GHz, when wt%(Co0.7Cu0.1Zn0.2Ce0.05Fe1.95O4)=15%,while doping of Co0.7Cu0.1Zn0.2Ce0.05Fe1.95O4 ferrites has little influence on the value of reflection loss, and the minimum value of the composites appears at the influency of 12 GHz and 18 GHz, which is-3.3d B. |
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