Abstract
Three-dimensional electron diffraction intensity data have been collected for the metastable alloy phase AlmFe by a precession technique. The structure model has been derived by Patterson and Fourier calculations and by the direct method using either maximum entropy and likelihood or the tangent formula; both were based on the kinematical scattering approximation. Energy-filtered convergent-beam profiles for reflections along two systematic rows h00 and hh0 were used to determine the corresponding structure factors; these were introduced in a dynamical scattering correction procedure for all hk0 structure factors. The tetragonal AlmFe structure (a = 8.84, c = 21.6 Å, space group I4¯2m) with 90 Al and 20 Fe atoms can be described by ten-coordinated Fe or by a distorted CsCl-type network with vacancies.
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Schedule a callMore From: Acta Crystallographica Section A Foundations of Crystallography
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