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Consortium:
University of Cologne PSI & ETHZ University Osnabrück University Potsdam University Vienna University Nancy Academy of Science Prague Bulgarian Academy of Sciences DRS digital solutions | ||
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| Schedule of Activities | ||
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| OPTO+ proposal | ||
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Contributions of the Research Groups
Institute of Mineralogy - University at Cologne, Germany
General Coordinator
The Institute of Mineralogy is based at the University at Cologne, Germany. A short overview on the activities of the group lead by PD Dr. Theo Woike is given below:
- Holographic Data Storage and its development toward technical applications
- Photorefractive materials such as LiNbO3, adjusting the physical properties by doping with Fe,Cu, Mn or by interdiffusion in KNbO3 with Fe,Cu, Mn
Stoichiometric LiNbO3, LiTaO3 by VTE = Vapour Transport Equilibration Technique
- Techniques for determination of stoichiometry, purity, doping as well as structure and electron density before and after treatments
- Techniques to write holograms into these material, determination of speed, sensitivity and influence of holographic scattering to these processes
- Pulsed write and read techniques to access the data without erasing
- Determination of material properties under the influence of external fields
Paul Scherrer Institut (PSI) / ETH Zürich, Villigen, Switzerland
Members of the Laboratory form the PSI team for Neutron Scattering ETHZ&PSI (LNS) and the Condensed Matter Theory Group. The SINQ-proposal 'Access to the Neutron Scattering Facility SINQ at Paul Scherrer Institut, No: HPRI-2001-00267' was successful within the 5th EU Framework Program 'Transnational Access to Research Infrastructures'. Due to the delay of the ratification (active June 1, 2002) of the bilateral agreements between the EU and Switzerland the 'Swiss Bundesamt für Bildung und Wissenschaft, BBW' decided in 2001 to grant the full allocated sum in them meantime by its own under the same conditions as the EU would have done.
Activities where PSI can contribute to this project:
- Structural investigation by neutron diffraction (4 instruments)
- Inelastic neutron scattering (3 instruments)
- Small angle scattering (2 instruments)
- X-ray diffraction by synchrotron radiation
- Sample specification my macroscopic measurements such as specific heat measurements and magnetic methods such as susceptibility, SQUID measurements
- Dedicated LINUX cluster for DFT (density functional theory) calculations
Number of scientists involved in the team: 5, whereof 2 Ph.D. students
Universität Osnabrück, Osnabrück Germany
The optical materials group is part of the physics department of the university of Osnabrück. The group has a strong cooperation with the crystal growth laboratory, its main activities are:
- Crystal growth of SBN of different compositions, undoped and doped with rare earths
- Crystal growth of LiTaO3 and some perovskites
- Optical spectroscopy in emission and absorption at various temperatures
- Measurements of optical constants and dielectric measurements
- Spatially resolved second harmonic generation
- Raman scattering
Number of scientists involved in the team: 3 (not including Ph.D. students)
Universität Potsdam, Postdam, Germany
Since several years the group structure analysis university of Potsdam deals with X-ray structure investigation of simple binary compounds under influence of an external high electric field.
The University of Potsdam can contribute to the project with the following activities:
- Measurements of the charge redistribution of doped LiNbO3, KNbO3 and
LiTaO3 under influence of external electric fields, - Determination of the doping dependence of inner displacements.
- Measuring the temperature dependence of inner displacements
- Development of an experimental set-up to measure the ferroelectric displacements due to an external magnetic field.
Number of scientists involved in the team: 3 (whereof 2 Ph.D. students)
Université Henry Poincarré, Nancy, France
The Laboratoire de Cristallographie et Modélisation des Matériaux Minéraux et Biologiques (LCM3B) is located at the University Henri Poincaré in Nancy France and is associated with the French National Research Centre, CNRS.
The activities within the laboratory of interest for the NoE :
- An internationally recognised expertise on measurements and interpretation of high resolution, accurate X-ray diffraction data with the aim of the determination of the detailed valence electron density in crystals
- The laboratory has at its disposal several X-ray diffractometers equipped with scintillation point detectors, image plates and CCD cameras
- Diffractometer attachments allowing to carry out the measurements from very low temperatures (10 K) to high temperatures (~1000 K)
- In-situ diffraction measurements from samples under laser irradiation
- In-situ diffraction measurements from samples under electric fields with a laboratory diffractometer or at a synchrotron radiation source
- Software for analysis of the experimental data obtained by above listed techniques
The experimental techniques allow studying how the dielectric, pyro- and piezo-electric properties are related to structure and to make accurate studies of structural changes induced by external perturbations and phase-transitions.
Number of scientists involved in the team: 3
Institute of Physics, Academy of Science of the Czech Republic, Prague, Czech Republic
The crystallographic group of the institute is specialized in structure analysis of difficult and aperiodic crystals. Such an analysis has primary importance for study of materials of technical communications and visual media. The computer program JANA2000 developed here is widely used in material science and the authors are very flexible in making improvements according to actual needs.
The main activities of the group lead by Dr. Vaclav Petricek are:
- Developing and modifying crystallographic computer program for solution and refinement of difficult and aperiodic structures
- Data collection on indoor diffractometer KUMA
- Solution and refinement of difficult aperiodic structures
Number of scientists involved in the team: 2
Universität Wien, Austria
The group is specialized in the specification of physical and material properties by means of holography. We are optimising the properties for thermal fixing of holograms. An other key issue of our activities is neutron interferometry on holographicaly produced lattices.
- Specialized Laboratory for holographic measurement with all kind of laser and optical equipment
- Dedicated neutron interferometer with damped optical table for holographic neutron scattering at the reactor of GKKS Geesthacht, Germany