Site preference and magnetism of Fe3−xCrxAl0.5Si0.5 |
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| Authors: | A Go K Re?ko L Dobrzyński JJ Milczarek M Biernacka |
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| Institution: | 1. Faculty of Physics, University of Bialystok, Lipowa 41, 15-424 Bia?ystok, Poland;2. National Centre for Nuclear Studies, 05-400 Otwock, A. Soltana 7, Poland;3. Faculty of Mathematics and Natural Sciences, College of Sciences, Cardinal Stefan Wyszyński University in Warsaw, 01-938 Warsaw, Woycickiego 1/3, Poland |
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| Abstract: | In order to gain better insight into the origin of the observed differences between Fe3−xCrxAl and Fe3−xCrxSi, alloys of Fe3−xCrxAl0.5Si0.5 (x=0, 0.125, 0.250, 0.375 and 0.5) were prepared and studied by means of X-ray and neutron diffraction as well as by magnetization measurements. Electronic structure calculations of these alloys have been performed by means of TB-LMTO-ASA method. It was expected, and experimentally verified, that the presence of silicon and aluminum atoms in 1:1 proportion will result in the independence of the lattice parameter on the iron/chromium concentration. All samples have been proved to be a single phase of the DO3-type of structure. Theoretical and experimental results indicate that chromium atoms locate preferentially in B sublattice. Cr magnetic moments are oriented antiparallel to Fe magnetic moments. Neutron measurements show a linear dependence of the magnetic moments of Fe(A,C), Fe(B) and Cr(B) as a function of Cr concentration. However the calculated total magnetic moment decreases faster with chromium content than indicated by the experiment. |
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| Keywords: | Transition metal alloy Magnetism DO3-structure Electronic structure X-ray diffraction Neutron diffraction |
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