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http://dx.doi.org/10.18419/opus-7047
Autor(en): | Gähler, Franz |
Titel: | Crystallography of dodecagonal quasicrystals |
Erscheinungsdatum: | 1988 |
Dokumentart: | Konferenzbeitrag |
Erschienen in: | Janot, Christian (Hrsg.): Quasicrystalline materials : Proceedings of the I.L.L. / Codest Workshop, Grenoble, 21 - 25 March 1988. Singapore : World Scientific, 1988, S. 272-284 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-46624 http://elib.uni-stuttgart.de/handle/11682/7064 http://dx.doi.org/10.18419/opus-7047 |
Zusammenfassung: | A detailed model structure of dodecagonal quasicrystals is proposed which applies to both dodecagonal Ni-Cr and V-Ni or V-Si-Ni. This model structure can be represented as the restriction of a 5d periodic structure to a 3d subspace, which is identified with physical space. The point group and the space group of the 5d periodic structure are determined. The latter is non-symmorphic, containing a set of glide "planes" and a screw axis. These space group elements lead to characteristic extinctions in the Fourier spectrum, which should be experimentally observable. A numeric calculation, which includes multiple scattering effects for electron diffraction, confirms the presence of the extinctions predicted by the space group analysis. The model structure proposed here serves as a very instructive example how crystallographic concepts, such as Bravais type, point group, or space group, can be applied to quasicrystals. |
Enthalten in den Sammlungen: | 15 Fakultätsübergreifend / Sonstige Einrichtung |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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gaeh7.pdf | 3,46 MB | Adobe PDF | Öffnen/Anzeigen |
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