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采用共沉淀法成功制备出具有超顺磁性的纳米Fe3O4,并将Fe3O4与SrFe12O19复合制成复合吸波材料Fe3O4-SrFe12O19,利用X射线衍射仪(XRD)、透射电镜(TEM)、振动样品磁强计(VSM)和矢量网络分析仪(PNA)对产物的物相、显微结构、磁性能和吸波性能进行了表征与分析。结果表明,当Fe3O4与SrFe12O19质量比为1∶0.3时,Fe3O4-SrFe12O19饱和磁化强度为11.1emu·g-1,矫顽力0.86Oe,剩余磁化强度0.08emu·g-1,其吸波性能最佳,最大吸收峰值为-17.7dB,-5dB频宽为1.3GHz,较Fe3O4和SrFe12O19的最大吸收峰值分别提高247%和185%,频带分别拓宽1.12GHz和0.40GHz。
The super-paramagnetic nano-Fe3O4 was successfully prepared by coprecipitation, and the composite microwave absorbing material Fe3O4-SrFe12O19 was prepared by compounding Fe3O4 and SrFe12O19. The XRD, TEM and Vibrational magnetic field (VSM) and vector network analyzer (PNA) were used to characterize and analyze the phase, microstructure, magnetic properties and microwave absorbing properties of the product. The results show that when the mass ratio of Fe3O4 to SrFe12O19 is 1: 0.3, the saturation magnetization of Fe3O4-SrFe12O19 is 11.1emu · g-1, the coercivity is 0.86Oe and the remanent magnetization is 0.08emu · g-1. The maximum absorption peak is -17.7dB and the -5dB bandwidth is 1.3GHz, which increases by 247% and 185% respectively compared with the maximum absorption peak of Fe3O4 and SrFe12O19. The band widens by 1.12GHz and 0.40GHz respectively.