Song Fuzhan, Shen Xiangqian, Yang Xinchun, Meng Xianfeng, Xiang Jun, Liu Ruijiang, Dong Mingdong
Institute for Advanced Materials, Jiangsu University, Zhenjiang 212013, China.
J Nanosci Nanotechnol. 2013 Apr;13(4):3115-20. doi: 10.1166/jnn.2013.7371.
The binary Ba0.5Sr0.5Fe12O19 (BSFO)/Ni0.5Zn0.5Fe2O4 (NZFO) nanocomposite ferrites hollow microfibers with high aspect ratios have been prepared by the gel precursor transformation process. These microfibers possess a high specific surface area about 45.2 m2 g(-1), and a ratio of the hollow diameter to the fiber diameter estimated about 5/7. The binary nanocomposite ferrites are formed after the precursor calcined at 750 degrees C for 3 h. Their minimum reflection loss (RL) is -38.1 dB at 10.4 GHz. The microwave absorption bandwidth with RL value exceeding -20 dB covers the whole X-band (8.2-12.4 GHz) and Ku-band (12.4-18 GHz). This enhancement in microwave absorption can be attributed to the exchange-coupling interaction, interfacial polarization and small size effect in nanocomposite hollow microfibers.
通过凝胶前驱体转化工艺制备了具有高纵横比的二元Ba0.5Sr0.5Fe12O19（BSFO）/Ni0.5Zn0.5Fe2O4（NZFO）纳米复合铁氧体中空微纤维。这些微纤维具有约45.2 m2 g(-1)的高比表面积，中空直径与纤维直径之比估计约为5/7。前驱体在750℃煅烧3 h后形成二元纳米复合铁氧体。它们在10.4 GHz时的最小反射损耗（RL）为-38.1 dB。RL值超过-20 dB的微波吸收带宽覆盖整个X波段（8.2-12.4 GHz）和Ku波段（12.4-18 GHz）。这种微波吸收的增强可归因于纳米复合中空微纤维中的交换耦合相互作用、界面极化和小尺寸效应。
