四氧化三铁（ Fe3 O4）是一种重要的铁氧体，由于具备优良的物理化学性质被广泛应用于各个领域。在趋磁细菌内存在的磁小体主要是由20～100 nm的单畴Fe3 O4和Fe3 S4组成，通常为立方体和立方八面体形状。制备了尺寸均匀的亚铁磁性立方体形状Fe3 O4纳米颗粒，利用透射电子显微镜（ TEM）、X射线衍射仪（ XRD）、SQUID－VSM磁性测量系统研究了保护气氛对Fe3 O4形貌和磁性的影响。%Magnetite ( Fe3 O4 ) is an important ferrite material .Due to the superior physical and chemical properties, Fe3 O4 nanoparticles are widely used in various fields .The magnetosome particles in the magnetotactic bacteria are composed primarily of 20~100 nm single-domain Fe3 O4 and Fe3 S4 nanoparticles, whose morphologies are cubic or cube-octahedral generally .In this paper , we prepared well-size-distributed ferrimagnetic Fe 3 O4 nanoparticles with the cubic shapes .The effects of the protective gas on the morphology and magnetism of Fe 3 O4 nanoparticles were studied by transmission electron microscope ( TEM ) , X-ray diffractometer,and SQUID-VSM magnetic measuring system .
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