Program Aperiodic crystals 2000

Laboratory of Crystallography, University of Bayreuth

BGI-Building, Phone: +49-921-553881, Fax: +49-921-553770, Address

Description of the course "Structural Analysis of Aperiodic Crystals" 1-4 March 2000

The course is intended for people who want to learn how to solve and refine incommensurately modulated structures and incommmensurate intergrowth crystals from x-ray scattering data.
In a series of lectures the following topics will be discussed:

The building principles of all types of aperiodic crystals (incommensurately modulated structures, incommensurate intergrowth compounds, and quasicrystals).
Superspace description of the symmetry and structure of incommensurately modulated compounds.
Fourier and Patterson methods for analysing aperiodic crystals.
Tools for the presentation and the interpretation of the incommensurate structures.

The lectures will be given in english. After the lecures, all participants will have the opportunity to practice refinements and calculations of properties on Personal computers using the system of programs JANA98 (written by Petricek, Prag). A tutorial with several examples will be provided, but your own data sets are welcome, too.

Program of the course "Structural Analysis of Aperiodic Crystals" 1-4 March 2000

at the Laboratory of Crystallography, University of Bayreuth, Germany.
Lectures and registration are on the 2^nd floor of the BGI building (room S66).

Wednesday 1 March 2000

Time
8:30	Registration
9:00 - 10:00	Introduction to aperiodic crystals	S. van Smaalen
10:00 - 10:30	Break
10:30 - 11:30	Superspace approach to the structure of incommensurately modulated crystals	S. van Smaalen
11:30 - 12:30	Symmetry of modulated structures	J. Lüdecke
12:30 - 14:00	Lunch
14:00 - 15:00	Introduction to JANA	S. van Smaalen
15:00 - 18:00	Computer workshop: Part 1: NiTa₂Se₇	S. van Smaalen J. Lüdecke

Thursday 2 March 2000

Time
9:00 - 10:00	Fourier maps in superspace	S. van Smaalen
10:00 - 10:30	Break
10:30 - 11:30	Incommensurate composite crystals	S. van Smaalen
11:30 - 12:30	Charge-density-wave compounds	J. Lüdecke
12:30 - 14:00	Lunch
14:00 - 15:00	Discussion of Part 1 of the Computer workshop	J. Lüdecke
15:00 - 18:00	Computer workshop: Part 2	J. Lüdecke S. van Smaalen

19:30	Dinner

Friday 3 March 2000

Time
9:00 - 10:00	Quasicrystals	S. van Smaalen
10:00 - 10:30	Break
10:30 - 11:30	Maximum Entropy Method	M. Schneider
11:30 - 12:30	NaV₂O₅: Commensurately modulated structures	S. van Smaalen
12:30 - 14:00	Lunch
14:00 - 15:00	Discussion of Part 2 of the Computer workshop	J. Lüdecke
15:00 - 18:00	Computer workshop: Part 3	S. van Smaalen J. Lüdecke

Saturday 4 March 2000

Time
9:00 - 10:00	Discussion of Part 3 of the Computer workshop	J. Lüdecke
10:00 - 10:30	Break
10:30 - 13:00	Computer workshop: Part 4	J. Lüdecke S. van Smaalen

13:00	Closing	S. van Smaalen

Course on aperiodic crystal structures