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Published in:
A Brief History of Aperiodic Crystals: 1962–2012 Read chapter Read first chapter

2013 | OriginalPaper | Chapter

22. Al4(Cr,Fe): A Structure Survey

Authors : B. Bauer, B. Pedersen, F. Frey

Published in: Aperiodic Crystals

Publisher: Springer Netherlands

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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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previous chapter Pseudo-Commensurate GdBaCo2O5+δ and Its Phase Transition at Elevated Temperatures
next chapter Phase Transitions in Aperiodic Composite Crystals
Literature
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Bauer B, Gille P (2011) Crystal growth of Al-rich complex metallic phases in the system Al–Cr–Fe using the Czochralski method. Z Anorg Allg Chem 637:2052–2058 CrossRef
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Metadata
Title
Al4(Cr,Fe): A Structure Survey
Authors
B. Bauer
B. Pedersen
F. Frey
Copyright Year
2013
Publisher
Springer Netherlands
Book
Aperiodic Crystals

Print ISBN: 978-94-007-6430-9

Electronic ISBN: 978-94-007-6431-6

Copyright Year: 2013

DOI
https://doi.org/10.1007/978-94-007-6431-6_22

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