Reciprocal-space imaging of a real quasicrystal. A feasibility study with PILATUS 6M

Thomas Weber, Sofia Deloudi, Miroslav Kobas, Yoshihiko Yokoyama, Akihisa Inoue, Walter Steurer

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

How many of the theoretically densely distributed Bragg reflections of a quasicrystal can be observed employing an area detector and synchrotron radiation? How does the reflection density of a real quasicrystal change as a function of exposure time, and what is the minimum distance between reflections? What does the distribution of diffuse scattering look like? To answer these questions, the Bragg reflection density of a perfect icosahedral quasicrystal with composition Al64Cu23Fe13 was measured employing a novel type of single-photon-counting X-ray pixel detector, PILATUS 6M, which allows noise-free data collection with the extraordinarily large dynamic range of 20 bit. The reflection density was found to be two orders of magnitude lower than expected for a strictly quasiperiodic structure. Moreover, diffuse scattering reflects significant structural disorder, breaking six-dimensional F-lattice symmetry. These findings have some implications for the interpretation of physical properties.

Original languageEnglish
Pages (from-to)669-674
Number of pages6
JournalJournal of Applied Crystallography
Volume41
Issue number4
DOIs
Publication statusPublished - 2008 Jul 24

Keywords

  • PILATUS 6M
  • Quasicrystals
  • X-ray diffraction

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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