Click on the photo to enlarge.
During March 17–20, 2011 the 7th Workshop on Structural Analysis of Aperiodic
Crystals took place at the University of Bayreuth.
This workshop was organized by Sander van Smaalen and Andreas Schönleber on behalf of the
special interest group 16:
Aperiodic Crystals (AK 16)
German Crystallographic Association (DGK)
Laboratory of Crystallography
University of Bayreuth.
Topics were the general foundations and theory of superspace and the actual methods of structure
determination and crystal–chemical analysis of incommensurately modulated structures and
incommensurate composite crystals.
The first lectures introduced the fundamentals of the higher–dimensional superspace approach
and superspace symmetry for the description of crystal structures of incommensurately modulated
compounds and incommensurate composite crystals, as well as the diffraction of aperiodic crystals.
An important part of the workshop was the working of the participants on the computer. In a computer room of the University of Bayreuth they were able to practice structure refinement and structure solution with the computer programs JANA2006 (V. Petricek, M. Dusek and L. Palatinus, Prague) and SUPERFLIP (L. Palatinus and G. Chapuis, Lausanne). A script with selected examples of different level of difficulty gave a step by step introduction in these programs and into the general procedure of structure analysis of aperiodic crystals. The questions and exercises in the script served as motivation, to work out the divers aspects of structure analysis in superspace, as for example the symmetry relations between the model parameters. For the working on the computer and the exercises about the half of the workshop time was sceduled. During this time the speakers served as tutors.
The participants are working in inorganic and organic solid state/structural chemistry, mineralogy and earth sciences, solid state physics, physical chemistry, materials science and engineering, biochemistry and molecular biology, and polymer and materials chemistry. This shows, that in all branches of crystallography there is a continued and unreduced interest in the topic of aperiodic crystals. Due to the positive feedback of the participants in this and in the last courses, the 8th Workshop on Structural Analysis of Aperiodic Crystals is scheduled for spring 2013.
Andreas Schönleber, Bayreuth, Germany