Electronic structure of the Fe-Cu-Nb-Si-B alloys by x-ray absorption spectroscopy
Electronic structure of the Fe-Cu-Nb-Si-B alloys by x-ray absorption spectroscopy
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DOI：
10.1063/1.126895
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发表时间：
2000-07-03
影响因子：
4
通讯作者：
Chin, TS
中科院分区：
文献类型：
--
作者：
Cheng, YH;Jan, JC;Chin, TS
我们测量了纳米晶-（nc-）和非晶-（a-）Fe73.5Cu1Nb3Si13.5B9（nc-FCNSB和a-FCNSB）和Fe 78 Si 13 B 9（a-FeSiB）合金的X射线吸收近边结构（XANES）光谱，在Fe L-3，L-2边缘使用样品漏电流模式，并在Cu L-3，L-2，和Nb L-3边缘和Si K边缘使用荧光模式。在最佳退火条件下，添加Cu和Nb后，nc-FCNSB的Fe L-3边XANES谱的特征发生了明显的形状变化，表明Cu和Nb对Fe 3d局域电子结构有很强的影响。通过对nc-FCNSB的Cu L-3、L-2边XANES谱的分析，发现Cu团簇基本上具有体心立方结构。Nb L-3边缘的白线特征表明，当a-FCNSB结晶成nc-FCNSB时，Nb 4d轨道的离域略有增加。Si K边XANES谱表明nc-FCNSB中Si原子周围的Fe-Si键占主导地位。(C)2000年美国物理学会。【S0003-6951（00）00424-1】。
We measured x-ray absorption near-edge-structure (XANES) spectra of nanocrystalline- (nc-) and amorphous- (a-) Fe73.5Cu1Nb3Si13.5B9 (nc-FCNSB and a-FCNSB) and Fe78Si13B9 (a-FeSiB) alloys at the Fe L-3,L-2 edge using the sample drain current mode and at the Cu L-3,L-2, and Nb L-3 edge and Si K edge using the fluorescence mode. The features in the Fe L-3-edge XANES spectrum of nc-FCNSB changed shape significantly with the addition of Cu and Nb to the Fe-Si-B alloy under the optimum annealing conditions, indicating that Cu and Nb strongly influence the Fe 3d local electronic structure. Closely examining the Cu L-3,L-2-edge XANES spectrum of nc-FCNSB reveals that the Cu clusters essentially have a body-centered-cubic structure. The white-line features at the Nb L-3 edge suggest a slight increase in delocalization of Nb 4d orbits when a-FCNSB is crystallized into nc-FCNSB. The Si K-edge XANES spectrum demonstrates the dominance of Fe-Si bonds around the Si atom in nc-FCNSB. (C) 2000 American Institute of Physics. [S0003-6951(00)00424-1].