EXAFS STUDIES OF AlMnSi AND AlMn PERIODIC AND APERIODIC ALLOYS

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Abstract
In a recent extended x-ray absorption fine structure (EXAFS) analysis of icosahedral and α-phases of AlMnSi it was shown from the Mn-Mn scattering that an icosahedron cage of Mn atoms with edge length [MATH] 5 Å is the structural unit in the icosahedral phase. In this paper we present results on the radial distribution function (RDF) of the first shell Al atoms yielded by a direct Fourier transform method from the EXAFS. This method yields a RDF with higher resolution and less bias than the usual method of fitting by a model. The results are consistent with the Mn-Mn analysis of similar icosahedral units interconnected differently in the i-phase than in the α-phase

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