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首页> 外文期刊>Journal of Materials Engineering and Performance >Properties and Structure of Ultrafine Amorphous Fe-Ni-B Powder Obtained by Borohydride Reduction
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Properties and Structure of Ultrafine Amorphous Fe-Ni-B Powder Obtained by Borohydride Reduction

机译：硼氢化物还原法制备的超细非晶态Fe-Ni-B粉末的性能和结构

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摘要

Ultrafine amorphous Fe-Ni-B powders were prepared by borohydride reduction, and their properties and structure were investigated by extended x-ray absorption fine structure (EXAFS), x-ray photoelec-tron spectroscopy (XPS), small-angle x-ray scattering (SAXS), Mossbauer spectra, transmission electron microscopy (TEM), differential scanning calorimetry (DSC), etc. The SAXS results for Fe4gNl2iB3i powders reveal the particle size statistic distribution, which is 1.7 nm, 80 percent; 6.4 nm, 8 percent; and 15.3 nm, 12 percent. TEM micrographs demonstrate the aggregates with fractal dimension of 1.5. The short-range order parameters of Fe_(48)Ni_(21)B_(31) powders are obtained from EXAFS measurement. The XPS studies reveal that the higher H_c values of the powder prepared at higher reaction temperature relate to the appearance of the satellite structure at about 715.6 eV, which Is characteristic for iron oxides, FeO/Fe_xO. This new interesting finding has been explained by the lattice misfit on the interface between the matrix and oxides, based on EXAFS studies. The crystalline behavior and magnetic properties demonstrate that there is BO significant difference in amorphous structure between the chemically synthesized powders and melt-span ribbons. However, the reasonable prediction of difference of amorphous structure and Its formation mechanism between them has been proved by the XPS depth profile of Fe_(48)M_(21)B_(31) powders, exhibiting considerable surface enrichment of boron and nickel, and EXAFS studies, showing a stronger Interaction between nearer neighbors in the powders.
机译：通过硼氢化物还原制备超细无定形的Fe-Ni-B粉末，并通过扩展X射线吸收精细结构（EXAFS），X射线光电子能谱（XPS），小角度X射线研究了它们的性质和结构。散射（SAXS），莫斯鲍尔光谱，透射电子显微镜（TEM），差示扫描量热法（DSC）等。Fe4gNl2iB3i粉末的SAXS结果显示出粒径统计分布，为1.7 nm，占80％。 6.4 nm，8％;和15.3 nm，占12％。 TEM显微照片显示了分形维数为1.5的聚集体。 Fe_（48）Ni_（21）B_（31）粉末的短程有序参数是通过EXAFS测量获得的。 XPS研究表明，在较高的反应温度下制备的粉末较高的H_c值与约715.6 eV的卫星结构外观有关，这是氧化铁FeO / Fe_xO的特征。基于EXAFS的研究，这一新的有趣发现是由基体与氧化物之间的界面上的晶格失配所解释的。晶体行为和磁性能表明，化学合成粉末和熔跨带之间的非晶态结构存在明显的BO差异。然而，Fe_（48）M_（21）B_（31）粉末的XPS深度剖面证明了非晶结构差异及其形成机理的合理预测，这些粉末表现出相当大的硼和镍表面富集，并且具有EXAFS研究表明，粉末中较近邻之间的相互作用更强。

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