Fe_80_B_20_,Fe_80_Si_6_B_14_；金属玻璃中近邻原子间的相互作用

用转靶X 射线源及弯晶EXAFS 谱仪测定了价:Fe_80_B_20_及 Fe_80_Si_6B_14_ 金属玻璃中铁的X 射线K 吸收谱. 由EXAFS 谱确定了两种金属玻璃的近邻结构参量. 此外, 通过测定XANES 谱并与纯铁及其有关的化合物Fe_2_B , FeB 中铁的XANES 比较发现: 吸收边能量、“白线”结构等均出现一些变化, 表明两种金属玻璃的近邻原子Fe-B , Fe-s毛以及Fe-Fe 之间的相互作用比铁与硼所形成的稳定化合物中要强, 这对于决定金属玻璃的短程序结构具有重要的作用.关键词：

THE INTERACTION BETWEEN NEAR NEIGHBORING ATOMS IN METGLAS Fe_80_B_20_ AND Fe_80_Si_6_B_14_

The X-ray K absorption spectra of iron in metglas Fe_80_B_20_ and Fe_80_Si_6_B_14_ are measured, using the rotating anode X-ray generator and the EXAFS spectrometer with bend crystal. The structural parameters of near neighbor of these metglases are determined by EXAFS. Besides, their XANES are also measured. While comparing the XANES of iron inmetglases with that in a-Fe, FeB andFe_2_B, we discovered some changes on the energies of their absorption edge and the characters of “white line” These show that there is stronger interaction between near neighboring atoms Fe-B, Fe-Si and Fe-Fe in metglases than that in the stable compounds of iron and boron. And this has an important effect on the shortrange order structure of these metglases.
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