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静电纺丝法制备Bi2Fe4O9及其磁学性能的研究
Magnetic properties of Bi2Fe4O9 synthesized by electrospinning
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摘要: 采用静电纺丝法合成了纤维状的Bi2Fe4O9前驱体，再对前驱体进行热处理得到了棒状的Bi2Fe409．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Bi2Fe4O9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Bi2Fe4O9．紫外一可见吸收光谱表明制备的Bi2Fe4O9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Bi2Fe4O9磁滞回线研究其磁学特性，相应的矫顽力Hc≈82Oe（1Oe=79．5775A／m），剥离顺磁信号后的剩磁Mr≈0．25emu／g，研究发现Bi2Fe409样品具有弱铁磁性，并且软磁性能有所提高．Abstract: The Bi2Fe4O9 fibrous precursor is successfully synthesized through electrospinning technique, and the single-phase claviform Bi2Fe409 is obtained after calcining the precursor. The UV-vis absorption spectrum shows that the absorption range of the as-prepared Bi2Fe4O9 is wide, which indicates that the as-prepared Bi2Fe4O9 could be a photocatalyst with visible-light-driven photocatalytic activity. In addition,the result of magnetic hysteresis loop for Bi2Fe4O9 shows weak ferromagnetism and good soft magnetic properties, which indicate that the as-prepared Bi2Fe4O9 has a good application in soft magnetic material.
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