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采用静电纺丝法合成了纤维状的Bi_2Fe_4O_9前驱体,再对前驱体进行热处理得到了棒状的Bi_2Fe_4O_9.通过X射线衍射、扫描电子显微镜及透射电子显微镜表征了合成样品的物相及形貌特征.结果表明合成的样品为Bi_2Fe_4O_9单相,属于正交晶系;退火处理导致纤维状的前驱体转变为棒状的Bi_2Fe_4O_9.紫外-可见吸收光谱表明制备的Bi_2Fe_4O_9对光的吸收范围广,不仅对紫外光具有较强吸收,而且对可见光也有一定的吸收.通过振动样品磁强计测定Bi_2Fe_4O_9磁滞回线研究其磁学特性,相应的矫顽力H_C≈82 Oe(1 Oe=79.5775 A/m),剥离顺磁信号后的剩磁M_r≈0.25 emu/g,研究发现Bi_2Fe_4O_9样品具有弱铁磁性,并且软磁性能有所提高.
The fibrous Bi 2 Fe 4 O 9 precursors were synthesized by electrospinning method, and the precursor Bi 2 Fe 4 O 9 was obtained by heat treatment.The phase and morphology of the synthesized samples were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that the synthesized sample is Bi_2Fe_4O_9 single phase and belongs to the orthorhombic system. The annealing process leads to the transformation of the fibrous precursor into rod-like Bi_2Fe_4O_9. UV-Vis absorption spectra show that the prepared Bi_2Fe_4O_9 has a wide range of light absorption, Has a strong absorption, but also has a certain absorption of visible light.The magnetic properties of Bi_2Fe_4O_9 hysteresis loop were measured by vibrating sample magnetometer, the corresponding coercive force H_C≈82 Oe (1 Oe = 79.5775 A / m) The remanence M_r≈0.25 emu / g after stripping the paramagnetic signal shows that the samples of Bi_2Fe_4O_9 have weak ferromagnetism and their soft magnetic properties have been improved.