The Local Atomic Structure Study of Ordered Fe3Si and Disordered by Grinding Fe75Si25 Alloys with EXAFS and Mossbauer Techniques

摘要

The ordered Fe3Si and disordered FejjSiis alloys are studied by X-ray diffraction, Mossbauer spectroscopy and EXAFS -analysis. The X-ray diffraction pattern and Mossbauer spectrum of the FeijSi2j alloy in comparison with those of the ordered sample give evidence for the set of local atomic configurations of Fe atom and are characteristic for the disordered bcc samples of the Fe-Si system. The comparison of x(k) in these alloys shows noticeable differences, especially in 3.5-5 A' 'region. Combining all the data obtained with the model x(k) one can draw the conclusion that the changes in the Fe atom local structu-re of the Fe-jSijj alloy are connected with breaking a long-range order but do not correspond to a chaotic distribution of atoms.