The hydrothermal method was used to dope different amounts of Co2+, Mn2+, and Cu2+ in nano-nickel zinc ferrite powder. X-ray diffraction (XRD), a scanning electron microscopy (TEM), and a vector network analyzer (VNA) were used to explore the influence of doping on particle size, morphology, and electromagnetic wave absorption performance. Pure nanometer cobalt nickel zinc ferrite phase was prepared using the hydrothermal method with an increasing Co2+ content. Results showed that the grain type structure changed from a spherical structure to an irregular quadrilateral structure with the average particle size increasing from 35 nm to 60 nm. The lattice constant increased from 0.8352 to 0.8404 nm with Co2+ doping. The increasing Co2+ can change the position of the absorption peak, increase the bandwidth of the absorber, and improve the performance of the materials in GHz low frequency. The doping ratio of Mn2+ can affect the size of the lattice constant, but nanocrystals are easy to reunite without improving the electromagnetic loss. However, the absorbance performance decreases. For the doping of Cu2+, there is an agglomeration phenomenon. When the doping quantity is 0.15, the absorbing wave performance becomes better.
4 nanocomposites were prepared by self-propagating combustion method and an in situ polymerisation method respectively. The structure, morphology, dielectric, magnetic and microwave absorbing capability of samples were characterised. The results show the average diameter of the Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 ferrites and PPy-Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 nanocomposites is about 15 and 50 nm respectively. In the frequency range of 5?0-20?0 GHz, the reflection loss of the PPy-Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 is between 216?25 and 220?27 dB, and the maximum value is about 220?27 dB at 18?0 GHz with a bandwidth of 2?0 GHz, which is obviously higher than that of the ferrites. The saturation magnetisation (M s ) and residual magnetisation (M r ) of the PPy-Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 are 1?29 and 0?43 emu g 21 , which are smaller than those of the ferrites. However, the coercive force (H c ) of the PPy-Co 0?7 Cu 0?1 Zn 0?2 Fe 2 O 4 nanocomposites is 38?96 KA m 21 , which is greater than that of the ferrites.
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