9th International Conference on Quasicrystals
May 22 - 26, 2005
Scheman Building
Iowa State University
Ames, IA 50011 USA
ICQ9@ameslab.gov
(515) 294-4896
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Last Modified: 01-Aug-2005
Scientific
Program
Conference Schedule at a Glance as of 05/06/05
Click HERE to download a pdf version of this schedule.
Sunday
Monday
Tuesday
Wednesday
Thursday
Welcome
8:15 - 8:50 am
Structural Evolution and Phase Stability
8:30 - 12:00 pm
Surfaces
8:30 - 10:40 am
Mathematics
8:30 - 10:10 am
Structures I
8:50 - 11:40 am
Electronic and Magnetic Properties
10:40 am - 5:00 pm
Thermal & Dynamical Properties
10:40 - 12:40 pm
Registration
1:00 - 4:00 pm
Lunch/ Poster Session
11:40 am - 1:40 pm
Conference Excursion to Living History Farms
12:00 - 5:00 pm
Lunch/ Poster Session
12:40 - 2:40 pm
Lunch/ Poster Session
12:40 - 2:20 pm
Tutorial
1:30 - 3:30 pm
Structures II
1:40 - 3:20 pm
Electronic and Magnetic Properties
(cont)
Mechanical Properties
2:20 - 3:40 pm
Vignettes
4:00 - 5:30 pm
Conference Picture
3:20 pm
Applications
4:10 - 5:50 pm
Welcome Reception and Registration
6:00 - 9:00 pm
Structures III
4:10 - 6:30 pm
New Frontiers
5:00 - 6:30 pm
Discussion Session
5:00 - 7:30 pm
Closing Remarks
5:50 pm
Conference Banquet
7:00 pm - ????
*Click on a name to see abstract
Click HERE to download a pdf version of this schedule.
Welcome Mompiou Kelton
Award/After Dinner
Address (8 - ???)
Invited Speaker Institute David Damanik California Institute of Technology, Pasadena Marc de Boissieu Domaine University, Saint Martin Julien Delahaye French National Center for Scientific Research, Grenoble Chuang Dong Dalian University, Dalian Roberto Escudero Universidad Nacional Autonoma de Mexico, Mexico D.F. Michael Feuerbacher Institute for Solid State Research, Jülich Vincent Fournée French National Center for Scientific Research, Nancy Yuri Grin Max-Planck Institute for Chemical Physics of Solids, Dresdin Dirk Holland-Moritz Institute for Space Simulation, Köln Ken Kelton University of Washington, Saint Louis Marek Mihalkovic Slovak Academy of Sciences, Bratislava Uichiro Mizutani Nagoya University, Nagoya Ralph Rosenbaum Tel Aviv University, Tel Aviv Lorenzo Sadun University of Texas, Austin Ryuji Tamura Science University of Tokyo, Tokyo Manuel Torres Instituto de Fisica Aplicada, CSIC, Madrid Hans-Rainer Trebin Stuttgart University, Stuttgart Goran Ungar University of Sheffield, Sheffield Akiji Yamamoto National Institute of Materials Science, Tsukuba
On Sunday, May 22 from 1:30 - 3:30 pm, Professor Walter Steurer from the University of Zürich, presented a tutorial entitled "Quasicrystals - The Crystallographer's Point of View".
Download the tutorial handouts by clicking HERE!
What do we want to know about the structure of quasicrystals? Is there any difference in the structural information a crystallographer is interested in, a mathematician, a chemist, a physicist or a materials scientist? Yes, there is. It depends on what you are going to do with this information. You have to base your quantum mechanical calculations on a realistic structure model otherwise your results will never describe and explain stability and physics of real quasicrystals. There is no need for a detailed description of order and disorder on a quasilattice if you just want to explore the mathematics of quasiperiodic tilings and coverings. Neither Schönflies nor Fedorov knew a single crystal structure when they derived the 230 3D space groups. Structure analysis is the core business of crystallographers. The determination of periodic structures, even large virus structures, has become more or less routine. The same is true for incommensurately modulated or composite structures while quasicrystals are still stubborn. Thanks to approximants, the local structure of quasicrystals is quite well known now. The kind of long-range order present in real quasicrystals and the role disorder plays for their stabilization is still far from being satisfactorily known and understood.
The following points were addressed in the tutorial:
- What does it mean to know and understand a (quasi)crystal structure?
- From simple to complex crystal structures.
- Particularities of quasicrystal structures.
- How to determine quasicrystal structures. Limits, pitfalls and potentialities of
- Diffraction methods.
- Imaging methods.
- Spectroscopic methods.
- Where are we now and how far will we be at ICQ-10?
- The best(?) models.
- Can we do better?
Vignettes of the Past and the Future On Sunday, May 22 from 4 pm until 5:30 pm, Drs. Dan Shechtman, Denis Gratias, Alan Goldman and Jean Marie Dubois will lead a special session on the discovery, some history you may not have heard, and what the future holds for the field, respectively. This is sure to be an interesting session so please plan to attend. Special Discussion Session Stabilization of Quasicrystals
There will be a two-hour discussion on "Stabilization of Quasicrystals," in the late afternoon of Wednesday, 25 May. This is a broad topic with many divergent, but interconnected, viewpoints represented within the research community. The broad goal of the session is to air and summarize these viewpoints.
The following specific topics will be covered:
thermodynamics
cluster stability
role of defects and disorder, including vacancies and phasonsAny and all ICQ9 attendees can contribute to this discussion. It will be guided by three leaders: Walter Steurer, Marc de Boissieu, and Chris Henley. Each leader will be putting together a paper to form the basis for the discussion. We strongly encourage you to download them in advance:
Stable Clusters in Quasicrystals - Fact or Fiction? by Walter Steurer
Stability of Quasicrystals: Energy, Entropy, and Phason Modes by Marc de Boissieu
The work of the session will be to: (i) define common terminology; (ii) describe any consensus that might emerge within the group; (iii) define the open problems, and (iv) describe needs for specific experiments or calculations.
The discussion will be summarized as part of the Conference Proceedings, published in Philosophical Magazine.