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用溶胶凝胶法制备了一系列Nd掺杂Ba-铁氧体粉末(Ba1-xNdxFe11.5Cr0.5O19,x=0.00,0.05,0.10,0.15,0.20),选取磁性能相对较好的Ba0.9Nd0.1Fe11.5Cr0.5O19作为磁核,通过原位聚合法制备了不同铁氧体含量的聚吡咯/Ba0.9Nd0.1Fe11.5Cr0.5O19(PPy/BNFCO)复合物.用X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、红外光谱(FTIR)、振动样品磁强计(VSM)、四探针测试仪和矢量网络分析仪等表征了铁氧体粉末和复合物微粒的结构、形貌以及电磁性能.结果表明,Nd的掺杂明显改变了Ba-铁氧体的饱和磁化强度和矫顽力;PPy/BNFCO复合物具有比较明显的核壳结构;复合物的饱和磁化强度随BNFCO含量的增加而增大;电导率则与PPy含量成正比,mpy/mBNFCO=5/1为复合体系渗流阈值;复合物对电磁波的反射损耗和有效带宽是PPy和ZCGFO协同作用的结果,当mpy/mBNFCO为5/1时,PPy/ZCGFO复合物中组分间的协同作用达到最大,其反射峰值和有效带宽分别达到-27.68dB和9.04GHz.PPy/ZCGFO复合物由于良好的微波吸收性能,有望成为电磁波吸收与屏蔽领域的候选材料.
A series of Nd-doped Ba-ferrite powders (Ba1-xNdxFe11.5Cr0.5O19, x = 0.00,0.05,0.10,0.15,0.20) were prepared by sol-gel method. The Ba0.9Nd0 .1Fe11.5Cr0.5O19 as magnetic core, polypyrrole / Ba0.9Nd0.1Fe11.5Cr0.5O19 (PPy / BNFCO) composites with different ferrite content were prepared by in-situ polymerization method.Using X-ray diffraction (XRD) , Transmission electron microscopy (TEM), scanning electron microscopy (SEM), infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), four probe testers and vector network analyzers were used to characterize the ferrite powders and composites The results show that Nd doping obviously changes the saturation magnetization and coercive force of Ba-ferrite. PPy / BNFCO composite has obvious core-shell structure. The complex The saturation magnetization increases with the increase of BNFCO content. The conductivity is proportional to PPy content, and the mpy / mBNFCO = 5/1 is the percolation threshold of composite system. The reflection loss and effective bandwidth of the composite are synergistic between PPy and ZCGFO As a result, when the mpy / mBNFCO is 5/1, the synergistic effect between the components in the PPy / ZCGFO complex is maximized, and the reflection And the effective bandwidth values respectively -27.68dB and 9.04GHz.PPy / ZCGFO composite microwave absorption due to good performance, the electromagnetic wave absorber is expected to be candidates in the field of the shield.