Al90FexCe10-x合金的局域原子和电子结构：XAFS分析

Local atomic and electronic structure of Al90FexCe10-x alloys: XAFS analysis.

作者信息

Mansour A N, Cibin G, Marcelli A, Sevastyanova T, Yalovega G, Soldatov A V

机构信息

Naval Surface Warfare Center, Carderock Division, West Bethesda, MD 20817-5700, USA.

出版信息

J Synchrotron Radiat. 2001 Mar 1;8(Pt 2):809-11. doi: 10.1107/s0909049500016770.

DOI:10.1107/s0909049500016770

PMID:11512939

Abstract

X-ray absorption fine structure (XAFS) above the Fe K-edge and the Ce L3-edge in amorphous Al90Fe(x)Ce10-x (x = 3, 5, and 7) alloys have been measured and analyzed. Quantitative analyses of the Fe K-edge and Ce L3-edge EXAFS spectra are limited to local structure parameters of the first coordination sphere. Using a theoretical multiple scattering (MS) approach, we show that the Fe and Ce XANES are sensitive to the structure of coordination spheres, which extend up to nearly 4.5 A. Comparison of experimental XANES spectra with theoretical MS results allows one to determine the local structure around the iron and cerium sites up to at least the third shell of atoms.

摘要

已对非晶态Al90Fe(x)Ce10 - x（x = 3、5和7）合金中Fe K边和Ce L3边以上的X射线吸收精细结构（XAFS）进行了测量和分析。Fe K边和Ce L3边扩展X射线吸收精细结构（EXAFS）光谱的定量分析仅限于第一配位球的局部结构参数。使用理论多重散射（MS）方法，我们表明Fe和Ce X射线吸收近边结构（XANES）对配位球的结构敏感，其延伸至近4.5埃。将实验XANES光谱与理论MS结果进行比较，可以确定铁和铈位点周围至少到第三原子壳层的局部结构。