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.
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Acknowledgement
The authors would like to thank Dr. Sandra Altmannshofer for providing the X-ray data set.
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Bauer, B., Pedersen, B., Frey, F. (2013). Al4(Cr,Fe): A Structure Survey. In: Schmid, S., Withers, R., Lifshitz, R. (eds) Aperiodic Crystals. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6431-6_22
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DOI: https://doi.org/10.1007/978-94-007-6431-6_22
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-007-6430-9
Online ISBN: 978-94-007-6431-6
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