Objective
The consortium for this project includes 5 INTAS and 4 NIS laboratories:
CO CNRS, Laboratoire de Cristallographie, Grenoble, France;
CR1 A.V. Shubnikov Institute of Crystallography, Moscow, Russia;
CR2 Moscow State University, Physical Department, Moscow, Russia
CR3 European Synchrotron Radiation Facitity, BP220, 38043 Grenoble, France;
CR4 Universität Bonn, Mineralogisch Petrologisches Institut, Bonn, Germany;
CR5 CLRC Daresbury Laboratory, Daresbury, UK;
CR6 Laboratoire de Mineralogie et de Cristallographie de Paris, Univ. Paris VI, Paris;
CR7 Institute of Solid Sate Chemistry & Mechanochemistry, Novosibirsk, Russia;
CR8 Institute of Inorganic Chemistry, Novosibirsk, Russia.
The project will be coordinated by J.-L. Hodeau (CNRS- Laboratoire de Cristallographie -Grenoble).
The scientific objectives are :
1. - to investigate experimentally and theoretically the "forbidden" reflections excited owing to the anisotropy of X-ray atomic factors in different crystals, including technologically important ones like Ge, Ge-Si, Fe3O4, LiNbO3.
- to analyse the dipole-quadrupole and quadrupole-quadrupole contributions into "forbidden" and allowed reflections;
- to extend these studies in the soft X-ray region (down to carbon K-edge);
2. - to develop instrumental facilities on synchrotron radiation sources to perform Resonant X ray diffraction and exploit the X-ray anisotropy effects.
- to extend these facilities into the soft X-ray region;
3. - to develop both phenomenological and ab-initio theories of X-ray anisotropy including effects of magnetic ordering;
4. - to study thermal motions, phase transitions and defect formation by means of the existence of "forbidden" reflections at energy close to the absorption edge;L5. - to study natural and diffraction-induced gyrotropy and circular dichroism in X-ray,
Our scientific consortium includes almos all the European groups working on the anisotropy of X-ray resonant scattering and gyrotropy.
The proposed consortium will enforce coordination of this type of activities in Europe and one of its many assets is the complementary between different participating teams. Teams CR1 and CR2 are known for their phenomenological studies whereas Teams CO and CR6 are more experienced in ab-initio calculations of the X-ray anisotropy. We will also benefit from the experience of team CR4 for calculating model-diffracted intensities versus the azimuthal setting angle of the crystal. Other experimental teams to extend the study of such effect in this energy range will use the experience of team CR8 in soft X-ray diffraction and absorption. High quality single crystal is needed to study the anisotropy properties, and Team CR1 has constructed a solid reputation in this matter from which other groups can benefit. The experience of Teams CR3, CR4, CR5, CR6, CO on synchrotron radiation studies at the ESRF, HASYLAB, DARESBURY, and LURE facilities and of Teams CR7 at Novosibirsk facilities will be used by Moscow teams (Teams CR1, CR2) at the just brand-new synchrotron facility in Moscow.
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Coordinator
38042 Grenoble
France
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