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Al4(Cr,Fe): A Structure Survey

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

Abstract

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.

Keywords

Neutron Diffraction Bragg Reflection Czochralski Method Superlattice Reflection Neutron Data 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgement

The authors would like to thank Dr. Sandra Altmannshofer for providing the X-ray data set.

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Copyright information

© 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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