Al4(Cr,Fe): A Structure Survey

  • B. BauerEmail author
  • B. Pedersen
  • F. Frey


A single crystal of Al4(Cr,Fe) grown by the Czochralski method has been investigated using X-ray and also neutron diffraction. The average structure of this crystal with a composition of Al79.1Cr17.8Fe3.1 was found to be body-centered orthorhombic with the space group Immm. Using neutrons it was possible to distinguish the Fe and Cr positions within the structure. However, the diffraction patterns of both, X-ray as well as neutrons, showed additional reflections beyond the Bragg reflections violating the body-centering and reducing the space group symmetry to Pmm2. A renewed structure analysis taking also these additional reflections into account exhibits significant changes of about 30 % of the atomic positions. Features related to extra diffraction phenomena beyond the Bragg reflections are discussed in some detail.


Neutron Diffraction Bragg Reflection Czochralski Method Superlattice Reflection Neutron Data 
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The authors would like to thank Dr. Sandra Altmannshofer for providing the X-ray data set.


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© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Department of Earth and Environmental Sciences, Crystallography SectionLudwig-Maximilians-Universität MünchenMunichGermany
  2. 2.Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II)TU MünchenGarchingGermany

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