Relationship between chemical and icosahedral local orderings in Al-Ni-Fe melts |
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| Authors: | A S Roik A V Samsonnikov V P Kazimirov V É Sokol’skii |
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| Institution: | (1) Laboratory of Solid State Physics and Magnetism, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium;(2) Present address: Institute of Surface Chemistry and Catalysis, University of Ulm, 89069 Ulm, Germany; |
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| Abstract: | An X-ray diffraction study and simulation of the structure of ternary Al81.6Ni14.9Fe3.5, Al71.6Ni23Fe5.4, and Al61.1Ni31.1Fe7.3 melts by the reverse Monte Carlo method are conducted. An analysis of the structural models of melts is performed by the
Voronoi-Delaunay partition. It is shown that the prepeak on the structure factor curves in the diffraction vector range of
13 nm−1 to 22 nm−1 is due to two factors: chemical ordering of atoms and non-crystalline close packing. The origin of the icosahedral short-range
order in the melts as one of the variants of ordering of atoms in non-crystalline close packed clusters is discussed. |
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