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Phason-flips refinement of and multiple-scattering correction for the d-AlCuRh quasicrystal
| Title: | Phason-flips refinement of and multiple-scattering correction for the d-AlCuRh quasicrystal |
| Authors: | Ruganski, Ireneusz Browse this author | | Strzalka, Radoslaw Browse this author | | Wolny, Janusz Browse this author |
| Keywords: | phason flips | | multiple scattering | | quasicrystals | | structure refinement |
| Issue Date: | Mar-2019 |
| Publisher: | International Union of Crystallography |
| Journal Title: | Acta crystallographica. Section A, Foundations and advances |
| Volume: | 75 |
| Start Page: | 352 |
| End Page: | 361 |
| Publisher DOI: | 10.1107/S2053273318017254 |
| Abstract: | The origin of the characteristic bias observed in a logarithmic plot of the calculated and measured intensities of diffraction peaks for quasicrystals has not yet been established. Structure refinement requires the inclusion of weak reflections; however, no structural model can properly describe their intensities. For this reason, detailed information about the atomic structure is not available. In this article, a possible cause for the characteristic bias, namely the lattice phason flip, is investigated. The derivation of the structure factor for a tiling with inherent phason flips is given and is tested for the AlCuRh decagonal quasicrystal. Although an improvement of the model is reported, the bias remains. A simple correction term involving a redistribution of the intensities of the peaks was tested, and successfully removed the bias from the diffraction data. This new correction is purely empirical and only mimics the effect of multiple scattering. A comprehensive study of multiple scattering requires detailed knowledge of the diffraction experiment geometry. |
| Rights: | © International Union of Crystallography |
| Type: | article |
| URI: | http://hdl.handle.net/2115/73541 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: Ireneusz Buganski
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